Understand how your students write with AI
Colophon logs every edit, paste, and AI interaction as a verifiable timeline.
It's one file — a verifiable record you control.
See it in action
A real look at the extension and the TWFF viewer.
At a glance, in the popup
Click the toolbar icon any time to see the current document's own-writing / AI / pasted breakdown and a running activity feed — no need to open a dashboard.
Lives beside your document
The panel floats right next to the page you're actually writing in — nothing to switch to, no separate app to keep open.
Open any session in the TWFF viewer
Drop a .twff file into the viewer — entirely in your browser, nothing uploaded — and get the full annotated, exportable report.
Don't have one? Try our sample essay or download the raw file.
Watch a full walkthrough
An early, unedited preview recording — start to finish, in real Google Docs.
Individual
Free
Students & independent writers
- ✓ Unlimited sessions
- ✓ Manual TWFF upload
- ✓ Personal writing timeline
- ✓ Offline-first & student-owned data
- ✗ Educator dashboard
- ✗ Share with teacher
Educator
Free
Accepted beta & case study educators
- ✓ Full educator dashboard
- ✓ Per-student AI usage reports
- ✓ Google Classroom sync
- ✓ Assignment-level breakdown
- ✓ Export PDF & CSV
- ✓ GDPR-compliant data handling
We review each application — accepted educators get full access at no cost.
Institutional
€3/student/semester
Per cohort · post-beta
- ✓ Everything in Educator
- ✓ Multi-class & whole-institution dashboard
- ✓ Admin & researcher views
- ✓ Anonymised longitudinal exports
- ✓ Bulk GDPR-compliant data management
- ✓ Dedicated onboarding support
Institutional pricing excludes VAT. Educator beta access is granted at our discretion — we prioritise case study partners. Research & institutional licensing enquiries — get in touch.
How we compare
| Feature | Colophon | GPTZero | Turnitin |
|---|---|---|---|
| Process logging | ✓ | ✓ | ✗ |
| Student-controlled data export | ✓ | ✗ | ✗ |
| Works offline / locally | ✓ | ✗ | ✗ |
| GDPR-compliant anonymisation | ✓ | Partial | Partial |
| Educator price | Free (beta) | ~$15/mo | Institutional |
| Open data format (TWFF) | ✓ | ✗ | ✗ |
Partner with us
Ethical AI in education.
Colophon is built on the belief that transparency — not surveillance — is how we make AI work for students and teachers alike. If you'd like to talk, get in touch below.
Research partnership
Access anonymised longitudinal writing data, co-author findings, and influence the research agenda.
Development sponsor
Fund a specific feature or integration. Get custom development, early access, and logo placement.
Institutional pilot
Deploy Colophon across a department or institution. Help shape the product for large-scale use.
Get in touch
Tell us a bit about your interest and we'll follow up within 48 hours.
Or email us directly at hello@firl.nl
Frequently asked questions
Is Colophon an AI detector?
No. Colophon does not try to guess whether text was written by AI. Instead it gives students and teachers a verifiable, timestamped record of the entire writing process — every keystroke block, paste, and AI interaction. A percentage score can be disputed; a timestamped edit history can be checked against the document itself.
What is a TWFF file?
TWFF (Transparent Writing Framework File) is an open format developed by the Functional Intelligence Research Lab. It is a ZIP archive containing a structured JSON log of writing events and the document content. Students own their TWFF files and can share or archive them independently. Read the spec →
Does data leave the student's device?
The Chrome extension records locally and never transmits data without explicit action. Uploading to the web app is opt-in. Students can use Colophon entirely offline and export their own TWFF files at any time.
Is student data GDPR-compliant?
Yes. Data is stored in the EU, retained for a configurable period (default 2 years), and students can request full erasure at any time. Data from users under 16 requires explicit parental consent and is excluded from all research exports unless fully anonymised.
How does the Educator beta work?
We're onboarding a small number of educators as case study partners during the beta. Apply by emailing us with your institution, subject area, and cohort size. Accepted educators get full dashboard access for their cohort at no cost for the duration of the beta period.