Comparison 22 // Local Voice DNA Workbench vs. Public Author Imitation Library.
grai ($79/yr Solo or $99/mo or $790/yr Agency) is an approximately 630 KB local HTML5 workbench built for founders and ghostwriting agencies. It measures your own cadence, enforces 8 deterministic regex rules plus a CV >= 0.32 burstiness floor, and issues signed client verification links.
| Option | Best For | Starting Price | Key Difference |
|---|---|---|---|
grai (Solo) |
Founders and ghostwriters enforcing their own or a client's real cadence before publishing. | $79/yr Solo ($99/mo or $790/yr Agency) | about 630 KB local HTML5 workbench. 8 structural rules + CV >= 0.32 floor + A4 SHA-256 Dossiers + ECDSA seals. |
| DoppelWriter | Experimenting with 129 famous or public writer styles across 71 task templates in the cloud. | $15/month billed annually ($180/yr, or $19/mo monthly; 20 free uses/mo) | Cloud catalog of 129 public voices and 71 templates, plus custom voice creation on the Pro plan. |
DoppelWriter starts with a library of 129 public writer voices and 71 task templates. Pick a voice, choose a template, and generate inside the cloud web app.
grai is built for people whose own name is on the line: founders, executives and boutique ghostwriting agencies. An executive on LinkedIn does not want to sound like a famous novelist. They want their draft to match their own historical sentence-length variance and pass a strict mechanical check so no reader spots synthetic phrasing.
grai Solo is $79/yr.CV >= 0.32 gate: checks every sentence against eight structural anti-slop rules and a mathematical burstiness floor. It highlights exact spans for 1-click surgical repair.connect-src 'none' by default, plus the MIT-licensed grai-mcp server for Claude Desktop, Cursor, Cline and Windsurf.grai.page/verify/:hash.| Criterion | grai (Solo $79/yr / Agency $99/mo or $790/yr) | DoppelWriter (Free / Pro $15 to $19 per month) |
|---|---|---|
| Pricing model | $79/yr (Solo) or $99/mo or $790/yr (Agency) | Free (20 uses/mo), $15/mo Pro billed annually ($180/yr) or $19/mo billed monthly ($228/yr) |
| Primary focus | Measuring and enforcing your own or your client's Voice DNA | 129 public writer voices + 71 task templates + Pro custom voices |
| Cadence verification | Deterministic 8 regex rules + CV >= 0.32 floor + span highlights |
No deterministic sentence-rhythm gate |
| Where profiles live | Browser localStorage and portable .grai files on disk |
Hosted inside the DoppelWriter cloud account |
| Agency proof | A4 SHA-256 Dossier + public ECDSA P-256 receipts at grai.page/verify/:hash |
None |
| What happens if you stop paying | You keep grai.html and your .grai voice files permanently |
Pro custom voices and unlimited cloud generation stop |
| Setup | Month 1 | 12-Month Total | 24-Month Total | What Is Included |
|---|---|---|---|---|
| DoppelWriter Pro (annual billing) | $15 | $180 | $360 | 129 public voices, 71 templates, custom voices in cloud |
| DoppelWriter Pro (monthly billing) | $19 | $228 | $456 | Same Pro features on month-to-month billing |
grai Solo Offline Edition |
$79 | $79 | $158 | Local about 630 KB workbench + Voice DNA profiler + 8-rule Cadence Gate + grai-mcp |
grai Agency Verification Protocol (annual) |
$790 | $790 | $1,580 | Up to 10 client profiles + A4 SHA-256 Dossiers + live ECDSA seals at /verify/:hash |
grai.html): Ships with a Content Security Policy (default-src 'none'; style-src 'unsafe-inline'; font-src data:; img-src data:; script-src 'unsafe-inline'; connect-src 'none'; object-src 'none'; base-uri 'none') that allows inline styles and inline scripts (plus data: fonts and images) while blocking direct API connections (connect-src 'none') from the page. Out of the box, it runs in Copy-Paste mode.localStorage when available. If your browser settings or private-browsing mode block localStorage on local file:// pages, grai falls back to in-memory session storage (memStorage), which lasts until the tab closes. Export a .grai backup file to save your profiles permanently to disk..grai file or PDF Dossier yourself. DoppelWriter runs generation and custom voices inside its cloud workspace by design.Choose DoppelWriter ($15 to $19/month) if: you want a cloud catalog of 129 famous writer styles and 71 templates for quick creative experiments.
Choose grai ($79/yr Solo, or $99/mo or $790/yr Agency) if: you publish under your own or your client's executive name, you need a deterministic 8-rule + CV >= 0.32 cadence gate, and you want local .grai profile files that you own permanently.
Annual licence. 30-Day Distinction Guarantee via [email protected].