Comparison 09 // Voice Measurement vs. Detection and Evasion.
grai ($69 once) does neither: it measures your own Voice DNA from 5 to 20 real samples, removes invisible Unicode watermarks (U+200B to U+200D, U+FEFF), and enforces 6 syntactic rules plus a burstiness floor (CV = sigma / mu >= 0.32) on text that is still yours.
| Option | What It Produces | Where the Voice Comes From | Key Difference |
|---|---|---|---|
grai (Founder $69 / Agency $149) |
A measured cadence profile, a scored draft with flagged spans, and an A4 Client Voice DNA Dossier. | From your own 5 to 20 samples, stored locally. | No detection score and no rewriting by a third party. The text stays yours and the gate is deterministic. |
| AI detectors (GPTZero, Originality.ai) | A probability that the text was machine-generated. | No voice model at all. | A guess about authorship, not a measurement of your rhythm. False positives are a known failure mode. |
| Cloud humanizers (Undetectable AI and similar) | A rewritten text tuned to lower a detector score. | A generic register chosen by the vendor. | The rewrite removes your signature habits along with the machine tells, and the text goes through a third party. |
A detector answers one question: how likely is this text to be machine-generated? That is a probability about authorship, computed by a model, and it is wrong in both directions often enough that universities and publishers argue about it publicly.
A humanizer answers a different question: how do I lower that probability? The usual method is to rewrite the text into a smoother, more neutral register. The output often passes the detector because it now reads like a careful student, which is precisely the voice a founder or a ghostwriter cannot afford.
grai answers a third question: does this draft still match the way this specific person writes? It compares the draft against a measured profile and a deterministic floor, then shows exactly which spans broke the pattern. It is not a detector and it does not promise to beat one.
Copy-pasted model output often carries invisible characters: zero-width space (U+200B), zero-width non-joiner (U+200C), zero-width joiner (U+200D) and the byte order mark (U+FEFF). They are invisible in every editor and they travel with the text into your CMS, your email client and your client deliverable.
grai strips them in the same pass that runs the audit, so the text you ship contains only the characters a reader can see. A detector score does not clean your file, and a humanizer may add its own artifacts.
| Criterion | grai (Founder $69 / Agency $149) | AI detectors and cloud humanizers |
|---|---|---|
| Pricing model | $69 once (Founder) or $149 once (Agency) | Subscription tiers per vendor, usually monthly; check the vendor page for current pricing |
| What it measures | Your own Voice DNA and the cadence of the draft | A probability of machine authorship, or a rewrite aimed at lowering it |
| Who owns the output | You. The text stays local and stays yours | The rewrite is produced by a third-party service |
| Effect on your voice | Preserves it and shows where it broke | Normalizes it toward a generic register |
| Invisible Unicode cleanup | Yes: U+200B to U+200D and U+FEFF are removed |
Not part of a detection score; a humanizer may add artifacts |
| What happens if you stop paying | You keep grai.html and your .grai files permanently |
Access to the service stops |
| Setup | Month 1 | 12-Month Total | 24-Month Total | What Is Included |
|---|---|---|---|---|
grai Founder (one-time) |
$69 | $69 | $69 | Local Voice DNA + Cadence Gate + Unicode cleaner + A4 Dossier export |
grai Agency Edition (one-time, for studios) |
$149 | $149 | $149 | 25 client profiles and client-ready SHA-256 Dossiers |
| Detector or humanizer subscription | Vendor price | Vendor price | Vendor price | A score or a rewrite, renewed for as long as you need it |
grai Founder + existing AI subscription |
$89 ($69 + $20) | $309 ($69 + $240) | $549 ($69 + $480) | The model you already use, gated locally before publishing |
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. A detector or a cloud humanizer receives the full text on its own servers by design, which is a different privacy trade than a local audit.Use a detector if: you need a second opinion on whether a submission looks machine-generated, and you accept that the score is a probability, not a verdict.
Avoid cloud humanizers if: the text carries your name or your client's. The rewrite trades your voice for a lower score, and the trade is usually bad.
Use grai ($69 once) if: you want the draft to be measurably yours before it ships. It cleans the invisible characters, shows the exact spans that broke your rhythm, and keeps the profile on your machine.
One-time payment. 30-Day Distinction Guarantee via [email protected].