Free tools for operators. No signup.

line items branded PDF validity window

Quote Generator

Build a priced quote with line items, tax, discount, notes. Export as a DH-branded PDF. Presets for agency, consultant, service work.

payment log IRS-ready rent receipts

Receipt Generator

Log a payment with payer, method, amount, balance, and item detail. Branded PDF. Presets for service, rent, partial payment.

buyer-side NET-30 terms ship + bill

Purchase Order

Issue a buyer-side PO with ship-to, bill-to, terms, and line items. Branded PDF. Presets for services, goods, software subscription.

5-page PDF acceptance milestones

SOW Generator

Multi-page statement of work with scope, deliverables, acceptance criteria, milestones. Branded PDF. Consulting, software, creative presets.

5 styles 50 names 9 industries

brand · generatornew

Business Name Generator

Fifty candidate brand names across five naming styles: abstract, evocative, compound, founder, descriptive. Industry-tuned word lists.

5 tones 40 taglines tone-aware

brand · generatornew

Slogan Generator

Forty taglines across five brand tones: confident, warm, minimal, bold, clever. Keyword-driven from your brand, noun, value, audience.

5 scores sentence flags grade level

content · checkernew

Readability Checker

Five readability scores: Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, ARI. Flags long sentences. Target grade 8 for web.

score 0-100 SERP pixels 4 contexts

content · checkernew

Headline Analyzer

Score any blog title, meta title, or ad headline 0-100 on length, power words, emotion, format fit, and SERP-pixel width.

6 thresholds unicode-aware top words

content · checkernew

Character Counter

Live counts of characters, words, sentences, paragraphs, lines, and reading time. Plus colored threshold badges for tweet (280), Bluesky (300), SEO title (60), meta description (155), Google Ads.

validate + pretty sort keys line+col errors

dev · formatternew

JSON Formatter

Validate, pretty-print, minify, sort keys, escape, unescape. Parse errors with exact line + column. Browser-only — your JSON never leaves the page, safe for API responses with secrets.

4 variants words/sent/para HTML wrap

design · generatornew

Lorem Ipsum Generator

Words, sentences, or paragraphs in four variants — classic Cicero Latin, hipster, designer-jargon, plain English. The placeholder text every wireframe needs without the cookie-walled generator pages.

12 cases live click to copy smart split

Case Converter

Type once, see all 12 cases live: UPPERCASE, lowercase, Title, Sentence, camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, dot.case, aLtErNaTiNg, iNVERSE. Click any to copy.

GFM toggle live preview .html download

Markdown → HTML

Type Markdown left, see live HTML preview right, raw HTML below. GitHub-flavored mode (tables, task lists, autolinks). Copy or download as a complete .html file. Powered by marked.js (MIT).

URL-safe mode file upload data:URI

dev · encodingnew

Base64 Encoder / Decoder

Auto-detect direction, URL-safe mode (RFC 4648 §5) for JWTs and URL params, file upload for binary, optional MIME detection + data:URI prefix wrap. UTF-8 native, browser-only.

NDJSON mode 6-mistake detector structure stats

dev · validatornew

JSON Validator

Deeper than parse-pass-fail. Surfaces parse errors with line + col + 30-char context. Common-mistake detector (BOMs, trailing commas, single quotes, comments). NDJSON / JSON Lines mode validates each line.

3 encode modes query parser RFC 3986

dev · encodingnew

URL Encoder / Decoder

Auto-detect direction. Three modes: encodeURIComponent (per-param), encodeURI (full URL), form (space-as-plus). Built-in query-string parser breaks URLs into key / value pairs.

8 styles live acronym-safe click to copy

content · converternew

Title Case Converter

Type once, see all eight renderings: AP Stylebook, Chicago Manual, MLA, APA 7th, NYT, sentence case, every-word-capped, ALL CAPS. Each card explains its style-guide rule. Click to copy.

accent-safe word-boundary trim change log

content · generatornew

URL Slug Generator

Transliterates accents (NFD), strips reserved characters, optional stopword removal, max-length truncation at word boundary. Hyphen / underscore separator, change log shows what was modified.

live highlight capture groups 8 presets

dev · testernew

Regex Tester

JavaScript RegExp flavor. Live highlight of every match, capture groups + named groups in side panel, replace preview with $1/$2 references, all 6 flags, library of 8 common patterns (email, URL, phone, ISO date, IPv4, UUID, hex, slug).

content · calculatornew

Reading Time Calculator

Live word count plus four reading-speed bands (slow / average / fast / scan) per Brysbaert 2019 baseline. Content-type multipliers for technical, narrative, casual prose. Custom WPM override.

4 speed bands content-aware 238 wpm default

auto-delimiter NDJSON output file upload

CSV → JSON Converter

Auto-detect delimiter (comma / tab / semicolon / pipe), header row, type inference. JSON array or NDJSON output for streaming consumers. File upload supported. Powered by PapaParse (MIT).

GFM tables live preview .md download

HTML → Markdown

Live side-by-side preview. GFM extension (tables, task lists, strikethrough). Bullet style and code-block style toggles. Copy or download as .md. Reverse direction of our Markdown → HTML. Powered by Turndown (MIT).

JSON view multi-doc 6-mistake check

dev · validatornew

YAML Validator

Live syntax check, parse-error line + col with surrounding context, equivalent JSON view to verify type inference, common-mistake detector for tabs / mixed indent / Norway-problem booleans. Powered by js-yaml (MIT).

3 gradient types unlimited stops Tailwind snippet

design · generatornew

CSS Gradient Generator

Linear, radial, conic gradients with unlimited color stops and draggable positions. Live preview, CSS output, Tailwind config snippet for design-system tokens. 6 brand-themed presets included.

5-layer stack 8 presets Material elevation

design · buildernew

Box Shadow Generator

Stack up to 5 shadow layers — per-layer offset, blur, spread, color, alpha, inset. Material elevation 1-4, neumorphism, soft-glow, retro hard, brutalist presets. Live preview on adjustable background.

6 cleanup passes live preview savings %

design · optimizernew

SVG Optimizer

Strips comments, editor metadata (Inkscape, Adobe, Sketch), redundant default attributes. Rounds decimals to configurable precision. Side-by-side preview + byte-savings percentage. Each pass independently toggleable.

median-cut algo 8 swatches Tailwind export

design · extractornew

Color Palette Extractor

Drop image to extract dominant + 8-color palette via median-cut quantization. Hex, RGB, HSL output per swatch. Click to copy. Tailwind config + CSS variables export. Powered by ColorThief (MIT).

9 variants JPEG/WebP/AVIF resize toggle

design · calculatornew

Image Compression Calculator

Drop any image. We re-encode at JPEG / WebP / AVIF across 3 quality levels each (9 variants total). Side-by-side preview with byte size + savings %. Pick the variant, download. Pure canvas API.

z-test math time projection scenarios

cro · calculatornew

A/B Test Sample Size

Per-variation sample size from baseline conversion + minimum detectable effect + power + confidence. Time-to-significance projection from daily traffic. Two-proportion z-test math.

finance · calculatornew

Startup Runway Calculator

Cash on hand + monthly burn + optional revenue → runway in months + extinction date + Chart.js visualization across four burn scenarios (current, +10% creep, -10% easy cuts, -25% restructure).

4 scenarios Chart.js timeline stage presets

p-value 4 verdict states technical breakdown

cro · calculatornew

Statistical Significance

Post-test analysis. Control + variant visitors and conversions in; p-value, confidence, lift, and verdict at 90/95/99% threshold out. Two-tailed default with one-tailed toggle.

4 verdict bands CAC payback stage presets

SaaS LTV:CAC Ratio

ARPU + gross margin + churn + CAC → LTV, LTV:CAC ratio, CAC payback. Industry-standard verdict bands at 1, 3, 5 cuts. Contribution-margin LTV (not the inflated revenue version).

5 verdict bands canonical formula board-deck ready

SaaS Magic Number

Sales-efficiency ratio per Scale VP definition. Previous-quarter S&M + current-quarter Net New ARR → magic number with five verdict bands (poor / monitor / healthy / under-investing / scale).

5 stages 2 engines + 2 leaks stage benchmark

SaaS Quick Ratio

(New MRR + Expansion) divided by (Churned + Contraction). The Mamoon Hamid growth-efficiency ratio with stage-aware verdict (Seed / Series A / B / C / Growth) showing whether the business is compounding or treading water.

Sacks tiers runway sanity $/$ growth

Burn Multiple Calculator

Net cash burn divided by net new ARR. The David Sacks 2020 framework with verdict tiers (amazing under 1, great 1-1.5, good 1.5-2, OK 2-3, suspect over 3). Cash-runway sanity check included.

7 categories engaged-MAU habit tiers

DAU/MAU Ratio Calculator

Stickiness percentage from daily active over monthly active. 7 category benchmarks (messaging, social, productivity, B2B daily/weekly, content, ecommerce). Habit-tier classifier per the Andrew Chen 20% line.

24-mo curve half-life 5 categories

Cohort Retention Calculator

24-month survivor curve from monthly retention rate, plus cohort half-life and total revenue per cohort. 5 category presets (B2B SaaS, consumer SaaS, mobile app, DTC subscription, marketplace). Chart.js retention curve.

3 ROAS thresholds refund-aware LTV-aware

Break-Even ROAS Calculator

Minimum ROAS to break even on ad spend = 1 / contribution margin. Refund-adjusted floor + LTV-aware target + operating multiple. Honest paid economics that account for COGS, refunds, and repeat purchases.

A-F grade 5 categories paste mode

HTTP Headers Checker

Paste raw response headers from curl -I or DevTools. Audits caching, security (HSTS, CSP, X-Frame, Referrer-Policy, Permissions-Policy), compression, server fingerprint. Letter-grade verdict.

25+ platforms confidence score evidence trail

CMS Detector

Paste HTML source — we identify 25+ platforms (WordPress, Shopify, Squarespace, Wix, Webflow, Ghost, Magento, BigCommerce, Hugo, Next.js, Gatsby, Astro, etc.) with weighted-confidence scoring per match.

60+ tools 10 categories signature evidence

Tech Stack Detector

Paste HTML — scans 60+ tools across 10 categories: JS/CSS framework, analytics (GA, Plausible, Mixpanel, PostHog), payment (Stripe, PayPal), ads (FB Pixel, TikTok), chat (Intercom, Crisp), A/B testing.

25 bot signatures AI crawler aware my-UA preset

dev · parsernew

User Agent Parser

Paste any UA string — get browser + version, OS + version, rendering engine, device class. Bot detection covers ~25 crawlers including AI training bots (GPTBot, ClaudeBot, Google-Extended, PerplexityBot).

15+ servers CDN + WAF detect security verdict

Web Server Detector

Paste Server header / response headers — identifies origin (nginx, Apache, IIS, Caddy), CDN / edge (Cloudflare, Vercel, Netlify, Fastly, CloudFront), app stack (PHP, ASP.NET, Express). Version-exposure security verdict.

live fetch redirect chain SEO verdict

HTTP Status Code Checker

Enter URLs — live-fetches each through AllOrigins. Reports status code, redirect chain, response time, plus per-code SEO verdict (301 vs 302 link-equity, 4xx categories, 5xx severity). Bulk URL paste supported.

live test preflight aware per-error fix

CORS Checker

Enter a target URL — runs live cross-origin GET, POST, and preflight tests from your browser. The browser's CORS error itself is the answer. Reports each Access-Control-* response header with a recommendation per failure mode.

paste or live RFC 6265bis OWASP audit

Cookie Analyzer

Paste Set-Cookie headers OR read this page's live cookies. Audits Secure, HttpOnly, SameSite (Lax / Strict / None), Path, Domain, Max-Age vs Expires, __Host- + __Secure- prefixes. OWASP-aligned hardening verdict.

A-F grade per-directive CSP Level 3

CSP Validator

Paste Content-Security-Policy header — parses every directive, flags unsafe-inline, unsafe-eval, wildcards, missing critical directives (default-src, script-src, frame-ancestors). Letter-grade hardening audit, OWASP-aligned.

9 frameworks 7 tooling layers deep signature

JavaScript Framework Detector

Paste HTML — identifies the JS framework (React, Vue, Angular, Svelte, Solid, Preact, Lit, Alpine, htmx) plus deeper layers: meta-framework, state management, routing, data fetching, UI library, build tool. Full developer-experience picture.

20+ CDNs multi-CDN aware per-CDN advice

CDN Detector

Paste curl -I or DevTools headers — identifies Cloudflare, Fastly, CloudFront, Vercel, Netlify, Akamai, Bunny, KeyCDN by signature header (cf-ray, x-vercel-id, x-served-by, x-amz-cf-id, +15 more). Multi-CDN stack detection.

5 algorithms Vary check Brotli + Zstd

Compression Detector

Paste curl -I — checks Content-Encoding (gzip / brotli / deflate / zstd / none), validates Vary: Accept-Encoding correctness, recommends optimal compression by traffic profile. RFC 9110-aligned.

A-F grade RFC 9111 9 directives

Cache Headers Checker

Paste curl -I — parses Cache-Control directives (max-age, s-maxage, public, private, no-cache, no-store, immutable, stale-while-revalidate), validates ETag + Last-Modified pairing. A-F caching grade per RFC 9111.

Protocol version Alt-Svc parse QUIC-aware

HTTP/2 + HTTP/3 Checker

Paste curl -I — identifies HTTP protocol version (1.1 / 2 / 3) from status line, validates Alt-Svc header for HTTP/3 advertising, recommends upgrade path. RFC 9113 / RFC 9114-aligned.

hop trace 301/302 audit loop detect

Redirect Chain Checker

Paste curl -ILv output — traces every 301 / 302 / 307 / 308 hop with destination URL, flags chain length, mixed 301/302 (link-equity bug), and protocol/host downgrades. Loop detection.

live API IPv4 + IPv6 ASN / ISP

IP Geolocation Lookup

Live IP-to-place lookup via ipapi.co free public API. Country, region, city, ISP, ASN, timezone, currency, calling code. Works for any IPv4 / IPv6 — or detects your own.

PSI live 4 audits SEO-ranking signal

Mobile-Friendly Test

Live Google PSI mobile audit — checks viewport, tap targets ≥48×48, font size ≥12px, content-width fit. Pass/fail per audit + fix recommendation. Critical for mobile-first indexing (Oct 2023).

A-F grade crt.sh CT log CAA + reach

HTTPS / SSL Checker

Composite TLS posture: live HTTPS reach + crt.sh Certificate Transparency log (cert history + issuer) + Cloudflare DoH CAA records (issuer authorization). A-F TLS-posture grade.

5 signals honest framing A-F grade

Domain Authority Checker

Composite 0-100 site-maturity score from public APIs: Wayback age + crt.sh cert count + CAA + SPF + DMARC. Honest about being NOT Moz DA — links out for paid backlink intel.

4-cat composite top 5 fixes A-F grade

Site Health Checker

PSI 4-category composite (Performance 40% + SEO 25% + Best Practices 20% + Accessibility 15%) with weighted health grade + top 5 cross-category fixes ranked by impact. Mobile or desktop strategy.

7 types per-type budget A-F grade

Page Weight Analyzer

PSI resource-summary breakdown — bytes by HTML / CSS / JS / image / font / third-party with per-type budget verdict. Surfaces the budget gap that's leaking weight.

LCP savings per-file fix CSS + JS

Render Blocking Checker

PSI render-blocking-resources audit — every CSS / JS file blocking initial paint with byte size + estimated LCP savings + per-file fix (critical CSS / async / defer / lazy-load).

1P / 3P split parse-time est. top 10 files

JavaScript Size Checker

PSI per-bundle JS breakdown — every JS file with size, first-party vs third-party split, top 10 by size, parse + execute time estimate on mid-tier mobile.

5 URLs side-by-side copy export

Multi-URL Audit

Bulk PSI audit on up to 5 URLs sequentially — comparison table with Performance / SEO / Accessibility / Best Practices scores + worst audit per URL flagged. Copy-table export.

1P/3P split RB flag A-F grade

CSS Size Checker

PSI per-stylesheet breakdown — every CSS file with byte size, first-party vs third-party split, render-blocking flag. PurgeCSS guidance + Google Fonts audit.

int/ext split rel audit noopener check

External Link Counter

Paste HTML — splits internal vs external <a> tags, lists rel attributes (nofollow, sponsored, ugc, noopener), flags missing rel=noopener security on target=_blank links.

outline tree skip detect WCAG 2.4.6

Heading Hierarchy Checker

Paste HTML — parses H1-H6 outline tree, flags multiple H1s, skipped levels, missing H1, empty headings. WCAG 2.4.6 + SEO featured-snippet ready.

6 formats CLS check lazy + srcset

Image Format Checker

Paste HTML — scans every <img> for format (JPG / PNG / WebP / AVIF / SVG / GIF), loading=lazy, srcset, width+height (CLS prevention). Modern-format adoption %.

25+ hosts ASN classify tier verdict

Hosting Provider Detector

DoH + ASN composite — identifies AWS, GCP, Azure, Vercel, Netlify, Cloudflare, DigitalOcean, Hetzner, Linode, OVH, Shopify, WP Engine + 15 more by ASN classification.

live verify honest framing 10 URL batch

Backlink Signal Checker

Live backlink verifier — paste up to 10 candidate URLs + your domain, fetches each, confirms link is present with anchor + rel + dofollow status. Honest about NOT being Ahrefs / Moz.

contribution net margin verdict

Profit Calculator

Contribution margin, net profit, and margin percentage from revenue minus COGS, shipping, fees, ads, and fixed costs.

payback 3-year NPV lift model

Shopify ROI Calculator

Payback month, 12-month return, and 3-year cumulative value on a Shopify rebuild from current GMV and lift assumptions.

blended CAC MER paid share

Blended CAC Calculator

True customer-acquisition cost past vendor dashboards. Sum paid + organic + tools + fees; divide by new customer count.

gross LTV LTV:CAC payback

LTV Calculator

Gross LTV, contribution LTV, LTV:CAC ratio, and CAC payback months from AOV, frequency, lifespan, and margin.

ecommerce · calculatordepth

CAC Payback Period

Exact months to recover acquisition cost. Cohort-aware retention curve, gross-margin adjustment, risk verdict per bracket.

months to payback cohort curve

per-channel break-even blended

ROAS Calculator

Return-on-ad-spend per channel, blended ROAS, and break-even ROAS from gross margin. Honest channel-level math.

lift simulator 8 categories CM/order

AOV Calculator

Average order value, CM per order, and category benchmark. Interactive lift simulator: what each +$5 of AOV adds in revenue.

BEP units margin of safety days runway

Break-Even Calculator

Break-even units, revenue, CM per unit, margin of safety, and days-to-break-even at your daily order velocity.

bidirectional conversion table effective margin

Markup Calculator

Bidirectional: enter cost plus markup %, margin %, or selling price. Markup vs margin conversion table, category presets, effective margin with shipping + CAC.

JSON-LD 6 types validated

Schema Markup Generator

Valid JSON-LD for Article, Product, FAQPage, LocalBusiness, Event, BreadcrumbList. Real-time validation, copy-ready, spec-aligned.

3 sub-types 110-char gate ImageObject

Article Schema Generator

Dedicated Article / BlogPosting / NewsArticle generator. Auto-counts headline at 110 chars, validates author + datePublished + image dimensions, outputs ImageObject (not bare URL).

merchant-grade offer + rating return policy

Product Schema Generator

Product + Offer + AggregateRating + Brand. Includes the merchant-listing fields (priceValidUntil, shippingDetails, hasMerchantReturnPolicy) Google requires for shopping rich results.

14 sub-types geo + hours NAP-aware

LocalBusiness Schema Generator

PostalAddress + GeoCoordinates with 5-decimal precision + per-day OpeningHoursSpecification. 14+ LocalBusiness subtypes (Restaurant, Dentist, Plumber, etc.). NAP-consistency reminder.

2 modes 10 itemReviewed policy gate

Review Schema Generator

Switch between individual Review and aggregate AggregateRating. Pick itemReviewed type from 10 options (Product, LocalBusiness, Movie, Book, Recipe, etc.). Self-serving check baked in.

unlimited Q+A dup-check policy gate

FAQ Schema Generator

Add unlimited Q+A pairs, get FAQPage JSON-LD with required fields. Inline validator catches duplicates, empty answers, and 220-char question over-length. Visible-mirror policy explained.

auto-numbered SERP preview CTR +3-7pp

Breadcrumb Schema Generator

Build BreadcrumbList JSON-LD with auto-numbered ListItem positions. Live SERP-style preview. The one rich result Google still renders for commercial sites in 2026.

11 sub-types attendance mode ticket offers

Event Schema Generator

Date + venue + offers + organizer. Includes the post-pandemic eventAttendanceMode + eventStatus fields Google requires (Offline / Online / Mixed). 11 Event subtypes.

3 previews 4 stacks char counter

Meta Tag Generator

Title, description, OG, Twitter Card with live Google SERP, Facebook, and X previews. Stack presets for HTML, WordPress, Shopify, Next.js Metadata API.

5 platforms quality score HTML parser

Open Graph Preview

Side-by-side preview of Facebook, X, LinkedIn, Slack, and Discord share cards. Paste HTML to auto-extract tags. Quality score 0-100, image dimension check.

5 checks duplicate detect paste-HTML

Canonical URL Checker

Paste page HTML — extracts the rel=canonical link, validates absolute / HTTPS / non-duplicate / no fragment / no UTM params. Catches the 'two canonical tags' bug.

ISO validation x-default check UK→GB warn

Hreflang Checker

Paste HTML — extracts every rel=alternate hreflang tag, validates ISO 639-1 + ISO 3166-1 codes against full lookup table, x-default presence, en-UK typo trap.

4 card types OG fallback paste-HTML

Twitter Card Validator

Paste HTML — extracts twitter:card / title / description / image / site / creator. Validates lengths + HTTPS image. Falls back to OG tags exactly like X's parser.

4 categories ≥3 floor nofollow detect

Internal Link Counter

Paste HTML + your origin. Splits every <a> into internal / external / fragment / pseudo-URL. Lists unique destinations + flags accidental nofollow on internal links.

5 buckets ratio bars scheme gate

Anchor Text Analyzer

Paste HTML + brand + target keyword. Buckets anchors as branded / URL / generic / partial / exact-match. Live ratio bars with the 8% exact-match safe-ceiling threshold.

priority sort A-resolve DoH

MX Record Checker

Type a domain — queries Cloudflare DoH for MX records, lists each by priority, and resolves each mail-server hostname's A record so you see the full delivery chain.

3 records SPF lookup count policy gate

SPF DKIM DMARC Checker

Email-auth triple-lock check. SPF mechanism count (10-lookup limit), DMARC policy strictness + pct=, DKIM with selector input. Required by Gmail+Yahoo since Feb 2024.

chain follow loop detect ≤ 2 hops

CNAME Lookup

Walks every CNAME hop until it reaches a terminal A or AAAA record. Catches alias loops + missing terminals. Flags chains over 2 hops (latency cost).

2 resolvers parallel query match-check

DNS Propagation Checker

Queries Cloudflare 1.1.1.1 + Google 8.8.8.8 in parallel. Match = propagated globally. Mismatch = still propagating across resolver caches. 6 record types supported.

A + AAAA + PTR 10 providers IP-input mode

IP Lookup

Type a hostname or IP. Resolves A + AAAA, performs reverse DNS (PTR), and surfaces the hosting provider hint (AWS / GCP / Azure / Vercel / Cloudflare) from the PTR string.

RDAP gateway acquisition signals no affiliate

domain · checkernew

Domain Availability Checker

Type a domain — one RDAP query tells you whether the registry has a record. No registrar funnel, no email gate, no affiliate redirect. Five reputable registrar links rendered for open names.

CT logs SAN list 5 quality checks

ssl · checkernew

SSL Certificate Inspector

Pulls the most-recent cert from public Certificate Transparency logs via crt.sh: issuer, subject, full SAN list, validity dates, days remaining. No agent install, no TLS handshake from your IP.

20 hosts at once 3 status bands copy summary

ssl · bulknew

SSL Expiry Monitor

Paste up to 20 hostnames at once. We query CT logs for each and render a sorted dashboard — days remaining, issuer, status band. Most cert outages live on a sub-domain you forgot you had.

CT enumeration live filter CSV export

recon · passivenew

Subdomain Finder

Enumerates every sub-domain ever issued a public SSL cert via Certificate Transparency logs. Passive — no scan packets at the target. Filter, sort, and CSV export the list.

RDAP + Wayback divergence flag re-registration

domain · historynew

Domain Age Checker

Cross-references RDAP registration date with Wayback Machine first-capture. Catches re-registered domains where the registry record looks fresh but the brand has been around for years.

7 presets QR code saved campaigns

marketing · buildernew

UTM Link Builder

Tag URLs with UTM parameters. 7 platform presets (Meta, Google, TikTok, LinkedIn, Email, Klaviyo, Newsletter), auto-lowercase, QR code output, localStorage saved campaigns.

15 AI bots 5 presets verdict

Robots.txt Generator

Platform presets for Shopify, WordPress, Webflow, Next.js. Individual toggles for every AI crawler (GPTBot, ClaudeBot, PerplexityBot, 12 more). Verdict line included.

auto-split 50k image sitemap hreflang

seo · generator

XML Sitemap Generator

Paste URLs or upload CSV, set priority + changefreq + lastmod. Image and hreflang annotations supported. Auto-splits above 50,000 URLs into a sitemap-index.

3 formats reciprocal check x-default

seo · generator

Hreflang Generator

Three-format output (HTML tags, XML sitemap, HTTP headers) with built-in reciprocal-link validator that flags every missing pair in amber. 4 locale presets.

n-gram Flesch score threshold

seo · checker

Keyword Density Checker

1-gram, 2-gram, 3-gram density with stop-word filtering. Flesch reading ease bundled. Calibrated over-optimization thresholds per content type (blog / landing / product).

ecommerce · checkernew

Shopify Speed Test

Google PageSpeed data for all four Lighthouse categories. CrUX field data. Shopify-specific app weight table (Klaviyo, Yotpo, Judge.me, etc.) sorted by kilobytes.

app weight CrUX field

GST split VAT reverse PDF

Invoice Generator

Client-ready PDF in 30 seconds. Four tax presets: US sales tax, UK/EU VAT with reverse-charge, India GST with CGST+SGST or IGST split, agency retainer. Multi-currency.

seo · flagship auditflagship

Website Audit

Four-category scorecard across Performance, SEO, Accessibility, and Best Practices. Runs Google PageSpeed Insights; surfaces top 2-3 wins per category with DH service pairing.

4 categories PSI API top wins

PSI API radar chart findings ranked

Lighthouse Score Checker

Single-purpose Lighthouse scoring across Performance, SEO, Accessibility, Best Practices. Mobile + desktop strategy. Top 10 audit findings ranked by impact, radar chart visualization.

field + lab 5 metrics CrUX p75

Core Web Vitals Checker

28-day p75 field data from CrUX plus a lab run for LCP, INP, CLS, FCP, TTFB on any URL. Per-metric verdict tied to Google's published thresholds. Field-vs-lab comparison chart.

5 signals DoH + RDAP grade A-F

Domain Health Checker

Five-signal composite: DNS records, HTTPS reachability, domain age (RDAP + Wayback), first-archive timestamp, PageSpeed score. Single composite Health Grade A-F with breakdown bars.

WHOIS Lookup

Live RDAP record for any domain: registrar, registration date, expiration, name servers, status flags. Dates auto-aged, status flags explained in plain language.

RDAP 6 cards EPP status

7 record types DoH SPF/DMARC

DNS Lookup

A / AAAA / MX / TXT / NS / CNAME / CAA in one parallel query via Cloudflare DoH. SPF + DMARC auto-detected and badged. Hygiene verdict on email + SSL posture.

timeline archive.org trust signal

Wayback Archive Viewer

First-capture date plus year-by-year snapshot timeline from Internet Archive. Click any year to open the snapshot. Coverage verdict per archive density.

8 types @graph in-browser

Structured Data Validator

Paste JSON-LD; we walk every node (including @graph), check ~30 rules per type across 8 schema.org types, surface pass/warn/fail per check. Runs entirely in your browser.

RFC 9309 16 UAs bulk URLs

Robots.txt Tester

RFC 9309 longest-match in-browser. Paste robots.txt + URL(s); pick from 16 user agents (Googlebot, GPTBot, ClaudeBot, PerplexityBot, etc.). Bulk-test up to 50 URLs.

mobile + desktop pixel gauge live render

SERP Preview Generator

See your title, URL, and meta description rendered as a live Google search-result snippet — mobile + desktop side by side. Pixel-width gauges, query bold-match preview, truncation marked.

8 checks canvas pixel-width stop-words

Title Tag Checker

Eight checks per title: length, pixel-width vs Google's 580-px cut-off, brand placement, keyword position, capitalization, separator consistency, duplicates, stop-word density. Paste plain text or full HTML.

120-155 chars CTA detector 920px gauge

Meta Description Checker

Seven meta-description checks: length, mobile pixel-width, action-verb presence, primary-keyword position, sentence count, trailing punctuation, generic-CTA detection.

WCAG 1.1.1 DOM scan 6 checks/img

Image Alt Text Checker

Paste HTML; we walk every <img> tag and run six checks per image: alt presence, decorative-empty, filename-as-alt, keyword stuffing, length, clickable-but-empty conflict. WCAG 1.1.1 alignment.

12 checks DOMParser urlset + index

XML Sitemap Validator

Paste a sitemap.xml; we run the full sitemaps.org spec: namespace, <loc> required, ISO-8601 lastmod, valid changefreq enum, 0.0-1.0 priority, 50K URL limit, same-origin rule. Handles sitemap-index too.

WCAG AA/AAA 5 thresholds swatch

Color Contrast Checker

WCAG AA and AAA ratio for normal text, large text, and UI components. Live swatch preview, brand presets, verdict per threshold. Accessibility compliance first.

6 sizes manifest ZIP download

brand · generatornew

Favicon Generator

Upload one square image. Download a ZIP with 6 PNG sizes (16-512px), apple-touch-icon, web manifest, and copy-ready HTML head tags. Canvas-based resize.

CVR + RPV 6 categories lift slider

Conversion Rate Calculator

CVR percent, revenue per visitor, category benchmark, and incremental-revenue lift simulator from +0.5% to +2.0% CVR. DTC, beauty, fashion, B2B, SaaS presets.

5 categories GA4-aware drop simulator

Bounce Rate Calculator

Bounce percentage, engaged sessions, conversion impact, and category benchmark gap (DTC, blog, B2B, SaaS, lead-gen). Drop simulator shows incremental conversions from 5-20pp bounce reduction.

5 stages leak detect 3 templates

Conversion Funnel Calculator

5-stage funnel: top-of-funnel volume × per-stage CVR. Identifies the leakiest stage by gap-vs-benchmark, projects incremental conversions from a +5pp lift on that stage. DTC, SaaS, B2B presets.

9 channels organic positions lift chart

CTR Calculator

Click-through rate, CPC spend, channel benchmark gap (Google Search, Meta, Display, TikTok, LinkedIn, email, organic SERP positions 1-10). Lift chart shows incremental clicks at +0.25 to +2pp.

24-mo projection target line $ at horizon

Email List Growth Calculator

Net monthly subscriber growth from signup % minus churn %. Projects subscribers at 6/12/24 months as a chart, plots target line, computes monthly email revenue at horizon. Klaviyo, Mailchimp, Beehiiv presets.

3 models tier targets net of fees

Affiliate Commission Calculator

Per-sale commission, monthly + annual net (network-fee adjusted), tier-bonus targets, and recurring SaaS lifetime value per signup. Flat, tiered, and recurring models. DTC, course, SaaS, hosting presets.

logo + revenue NRR annualized

Churn Rate Calculator

Logo churn, revenue churn, Net Revenue Retention, and annualized churn from monthly movement. SMB, mid-market, and enterprise SaaS presets with benchmark verdicts.

Net New MRR Quick Ratio MoM growth

MRR / ARR Calculator

End-of-month MRR, annualized ARR, net new MRR, MoM growth, and SaaS Quick Ratio from plan-mix movement. Early, growth, and scale-stage presets with Quick Ratio verdict.

auto-apply 5 redirects QR code

marketing · buildernew

Shopify Discount URL

Auto-apply discount share URL with 5 redirect presets (home, product, collection, cart, checkout), optional UTM tags, and QR code download for offline campaigns.

H1-H6 tree skip warnings WCAG 1.3.1

Heading Outliner

Paste HTML, get an indented H1-H6 outline with warnings for missing H1, skipped levels, duplicate H1s, and empty headings. SEO and WCAG 1.3.1 compliance in one view.