GPTZero and tools like it read a finished piece of text and estimate the odds an AI wrote it. Proofwriter takes the opposite approach: it records how you actually wrote the piece, in real time, so there's real evidence instead of a probability score.
| Proofwriter | GPTZero | |
|---|---|---|
| How it works | Records your process as you write — checkpoints, revisions, timing | Analyzes finished text and estimates a probability it was AI-written |
| What you get | A shareable Proof page: the writing, the revision history, a timestamp | A percentage score on a piece of text |
| Who it defends | The writer — evidence you can point to when accused | The reader/editor screening incoming text — not built for the writer’s defense |
| False positives | Not applicable — Proofwriter never accuses anyone of anything | A known risk with any detector scoring finished text after the fact |
| Durability of evidence | Blockchain-anchored timestamp, independently verifiable | A score at a point in time, not an anchored record |
GPTZero-style detectors are built to screen text after the fact — useful for an editor scanning submissions, but they can only ever produce a guess, and guesses can be wrong in both directions. If you’re the writer being screened, a detector’s verdict isn’t something you can appeal; it’s just a score.
Proofwriter puts the evidence in the writer’s hands instead. Every checkpoint, every revision, and the timing of how the piece came together are recorded as you draft — then anchored to the blockchain so the record can’t be quietly edited after the fact. Instead of hoping a detector reads your writing correctly, you have a Proof page that shows your actual process.
Your first three Proofs are free.
Start writing free