Comparison 21 // Local Voice Workbench vs. Cloud AI Rewriter.
grai ($79/yr Solo or $99/mo or $790/yr Agency) is an approximately 630 KB local HTML5 workbench and MCP gate with zero character quotas, 8 deterministic regex rules, a CV >= 0.32 burstiness floor, and signed client verification receipts.
| Option | Best For | Starting Price | Key Difference |
|---|---|---|---|
grai (Solo) |
Full drafting, surgical span repair, unlimited local cadence checks, and agency proof. | $79/yr Solo ($99/mo or $790/yr Agency) | about 630 KB local HTML5 workbench + 3-galley Writing Desk + 8-rule deterministic gate + grai-mcp. |
| Timbro | Rewriting existing AI drafts in the cloud with character-metered quotas and fact preservation. | $12/month ($144/yr, 110,000 characters; 3 free rewrites) | Hosted cloud rewriter with 7 rewrite modes and explicit fact, number, quote and link preservation. |
Timbro is designed for the final rewrite pass. You upload at least 900 words of your own writing, paste a draft produced by ChatGPT or Claude, pick one of seven rewrite modes, and let Timbro rewrite the text inside its cloud interface while keeping your numbers, quotes and links intact.
grai covers the entire workflow before and after the draft exists. It extracts a quantitative Voice DNA profile from 5 to 20 posts, challenges weak premises before drafting, generates three structural galleys (Scalpel, Broadsheet, Ledger), and runs a deterministic 8-rule + CV >= 0.32 audit locally in your browser. Instead of rewriting the whole page blindly, grai highlights the exact offending spans and repairs only those spans.
grai runs locally on your machine with unlimited cadence audits.grai checks the output against 8 hard regex rules and a CV >= 0.32 sentence-length variance floor.grai-mcp lets Claude Desktop, Cursor, Cline and Windsurf score drafts offline before showing them to you.grai.page/verify/:hash.| Criterion | grai (Solo $79/yr / Agency $99/mo or $790/yr) | Timbro ($12 to $59 per month) |
|---|---|---|
| Pricing model | $79/yr (Solo) or $99/mo or $790/yr (Agency) | 3 free rewrites, then $12/mo Starter ($144/yr), $23/mo Pro ($276/yr), $59/mo Premium ($708/yr) |
| Usage limits | Unlimited local audits and unlimited local prompts | Metered monthly character quotas (110,000 / 240,000 / 620,000 characters) |
| Core mechanism | Voice DNA profiler + 3-galley Writing Desk + 8-rule deterministic gate + surgical span repair | Cloud neural rewriter across 7 modes |
| Cadence verification | 8 regex rules + CV >= 0.32 burstiness floor in browser and via grai-mcp |
No deterministic sentence-rhythm gate or public receipt |
| Where data lives | Browser localStorage and local .grai files on disk |
Hosted in the Timbro cloud web application |
| What happens if you stop paying | You keep grai.html and your .grai voice profiles permanently |
Monthly character quota and cloud rewriter access end |
| Setup | Month 1 | 12-Month Total | 24-Month Total | What Is Included |
|---|---|---|---|---|
| Timbro Starter (110,000 chars/mo) | $12 | $144 | $288 | Entry cloud rewriter with 110k monthly character cap |
| Timbro Pro (240,000 chars/mo) | $23 | $276 | $552 | Mid-tier cloud rewriter with 240k monthly character cap |
| Timbro Premium (620,000 chars/mo) | $59 | $708 | $1,416 | High-volume cloud rewriter with 620k monthly character cap |
grai Solo Offline Edition |
$79 | $79 | $158 | Unlimited local Voice DNA profiling, 3-galley desk, and 8-rule Cadence Gate |
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. Timbro processes every rewrite inside its cloud service by design.Choose Timbro ($12 to $59/month) if: you only want a cloud rewrite button for existing drafts, your monthly volume fits inside a character quota, and you do not need a deterministic cadence gate or agency verification receipts.
Choose grai ($79/yr Solo, or $99/mo or $790/yr Agency) if: you want an offline HTML5 workbench with zero character caps, a deterministic 8-rule + CV >= 0.32 gate that highlights exact spans instead of rewriting blindly, and cryptographic proof for client deliverables.
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