1. Voice DNA Profiler
Paste 5 to 10 posts. In 30 seconds, Grai extracts your unique cadence, sentence variance, and signature phrasing. Your Voice DNA stays saved in local browser storage.
grai
THE PERSONAL VOICE ENGINE.
100% OFFLINE.
ZERO SUBSCRIPTION.
Everyone sounds the same.
You do not have to.
Your feed is flooded with generic AI text: polite, flat and instantly forgettable. Nobody remembers it. The only unfair advantage left is a distinct personal voice. Grai turns your writing into your strongest personal brand: it measures rhythm, cuts template phrasing, and locks in your natural authority. The generic gets culled. So every post sounds unmistakably like you.
One fileRuns in your browser100% private
Brand contrast: corporate template vs. distinct voice
Most founders think they lack distribution. They don't. They lack voice. When your writing sounds like a polite corporate summary, nobody remembers you. When your rhythm hits like a conversation, clients reach out.
LIVE VOICE CALIBRATOR
Browser local
32
/100
Flat cadence. Sounds like everyone else.
Sentence rhythmshort/long --monotone
shortlongest --long
Voice mechanicSignals
Six checkers and one rhythm floor. Paste the specimen over the draft. Nothing leaves your browser.
The method
Deleting banned words did not fix your writing.
It just made you a quieter robot.
Every AI writing tool tells you to block the mocked words. You deleted the vocabulary. The habits stayed.
Our analysis of 134,522 LinkedIn posts from 1,499 profiles, January 2023 to September 2026, proved it: writers removed the mocked words, but identical sentence lengths and predictable rhythms increased by 400%.
| Habit | 2023 | 2026 | Change |
|---|---|---|---|
| "Here is why" opening | 1.3% | 9.6% | 7.4x |
| "It is not X, it is Y" | 1.2% | 5.9% | 4.9x |
| Arrow bullets | 0.6% | 12.3% | 20.5x |
| The word everyone mocks | 4.2% | 0.5% | blocklist worked |
Source: LigoSocial, published 2026-09-25. The percentage pairs were read from a CSV export, not from the published page, so treat them as directional. Read the full empirical study and methodology →
Your personal brand cannot be built on word blocklists. It is built on architecture: sentence variance, rhythm shifts, and structural authority that no generic model can copy.
How it works
Your complete writing cockpit. 100% offline on your machine.
2. The Writing Desk
Type a rough thought, bullet points, or a voice memo transcript. Grai challenges your weak premises, then writes three complete drafts calibrated strictly to your voice: Scalpel (short punch), Broadsheet (deep essay), or Ledger (data-first).
3. Cadence Gate & Proof
Every draft is measured against your Voice DNA before you publish. Flat AI corporate habits get highlighted and removed. You publish prose that sounds unmistakably human and authentically yours.
Why it works
We did not fine-tune a model. We harnessed one.
Google Research proved it with Harness2: don't burn cash fine-tuning models. Harness them with deterministic prompts, cadence verifiers, and offline profiles.
The paper keeps model weights frozen and improves the system around the model: prompt, tools, skills, memory, guardrails. One harness step lifted GLM-5 and Gemini 3.5 Flash by up to 11.5 points on WorkBuddy-Bench, 4.5 points on JobBench, and 11.8 percentage points on LAB's partial pass rate.
The harness is the product
Grai ships the harness: a deterministic instruction set, six cadence verifiers, a rhythm floor, and a voice profile stored on your machine. Swap the model and your voice survives. No training run, no GPU bill, no vendor lock.
For ghostwriters & agencies
Prove to clients your work is not lazy ChatGPT.
When you charge $2,000+ a month per client, you cannot deliver copy that sounds like a default AI prompt. The Ghostwriter & Agency edition generates a Client Cadence Certificate: a printable A4 page documenting the measured cadence of their profile and a SHA-256 cryptographic fingerprint.
Attach it to your invoice or deliverable. It gives clients hard, mathematical proof that their copy was calibrated to their unique voice, not generated at random.
Client Cadence CertificateA4 / SHA-256
Distinct client voice verified. Cadence and structure recorded.
Profile fingerprint: 64 hexadecimal characters.Free Voice Guide
Get the Offline Voice Architecture Blueprint.
Not ready for the full engine? Start with the 12 syntactic patterns that separate distinct founder writing from generic AI output. One compact reference sheet (PDF) with prompt formulas. Keep it on your desktop. Zero spam.
Editions
Two editions, one payment each.
Founder Edition
$69
one-time payment · lifetime access · one person
Built for founders and independent builders who want an unmistakable personal brand that commands attention and attracts clients.
- The complete offline writing app (grai.html)
- Voice DNA profiler (extract your personal cadence)
- The Writing Desk (generate Scalpel, Broadsheet & Ledger drafts)
- Six structural cadence checkers & rhythm floor
- 100% private: runs locally in your browser, zero telemetry
- One year of engine updates included
most ghostwriters start here
Ghostwriter & Agency Edition
$149
one-time payment · commercial licence · one company
Built for professional writers and agencies managing multiple high-paying client voices every day.
- Everything included in Founder Edition
- Multi-client voice switcher (unlimited distinct client profiles)
- Client Cadence Certificate generator (A4 / SHA-256 proof)
- Premise sparring engine (pushes back on weak premises)
- Commercial client licence & priority updates
The 30-Day Distinction Guarantee. If Grai does not make your writing visibly sharper and faster to produce within 30 days, send one email. 100% refund, no forms, no questions.
Checkout by Lemon Squeezy. They handle VAT and receipts. One payment, no subscription.
Questions
The five questions everyone asks.
Is this a subscription?
No. One payment buys one file. There is no server, no account, no seat count. You download a folder, open grai.html, and it runs, about 600 KB in your browser storage. No telemetry, no third party tracking, no monthly charge.
Does it write for me, or just score me?
Both, in that order. The Voice Profiler measures your cadence first. The Writing Desk then drafts inside your exact voice: you drop a rough thought or transcript, Grai sparres with your premise, and delivers three distinct drafts (Scalpel punch, Broadsheet depth, Ledger evidence). Connect your own API key (Anthropic, OpenAI, OpenRouter or local endpoints), or use offline Copy & Paste mode with zero keys.
What does the Cadence Certificate prove?
One measurement, one profile, one moment. The page carries a SHA-256 fingerprint of the profile it was measured against, so any later change is detectable. It gives clients cryptographic proof that the draft respects their calibrated Voice DNA.
What if I want my money back?
30 days, one email, no forms, no questions. If Grai did not make your writing visibly sharper or faster to produce, you should not keep it.
Can I see it before paying?
The calibrator above is the real engine. It runs the same deterministic rules that ship in the app. Paste any draft into it. If you want the full build measured against your own drafts, buy it, use it for 30 days, and keep the guarantee in your pocket.
How does an offline HTML app work on my computer?
You receive one standalone file: grai.html. Double-click to open in any modern browser. Zero installation. Your Voice DNA stays saved directly in local browser storage, and the entire engine works offline with no Wi-Fi.
Your unfair advantage
Build a personal brand voice nobody can imitate.
Take last week's post. Grai returns a number and the six mechanics behind that number. You already suspected the flat lines. Nine minutes of edits and they are gone.
Then publish it again, in your own cadence, with no name attached. Not cleaner. Not more polite. Yours, from the first two lines.
Get the licence $69One payment · One file · No account · A voice nobody can imitate
Checkout by Lemon Squeezy. Grai is a trademark. The instruction set is MIT and free if you only want the prompts.