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.

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

seo · generatornew

Schema Markup Generator

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

3 previews 4 stacks char counter

seo · generatornew

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

seo · checkernew

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.

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

seo · generatornew

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

WCAG AA/AAA 5 thresholds swatch

seo · checkernew

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.

logo + revenue NRR annualized

saas · calculatornew

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

saas · calculatornew

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

seo · checkernew

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.