Study companion for Android
Your material. Your phone. Your study companion.
Upload your notes, ask questions grounded in your documents, and test what you learned — all running on your phone. No account. No subscription. No data leaves your device.
Get early access
Built for students
AI study tools,
without the catch.
Free
Without the bill
No server means no per-user cost. Study tools that don't need a subscription to sustain themselves.
Unlimited
Without the quota
The model runs on your hardware. No rate limits, no session caps, no waiting.
Private
Without the tradeoff
Your coursework stays on your device. Nothing is uploaded, processed, or stored anywhere else.
What you can do
Study, verify, test.
Ask from your documents
Import lecture notes, readings, or a resume. Cairn chunks and indexes them locally, then answers your questions from that specific material.
See where it came from
Every answer cites its source — the document, the passage. Tap a citation to see the original text. Verify, don't trust.
Quiz yourself
Generate quizzes from your notebook material. Same documents, different mode — study, then test what stuck.
Local-first
Nothing leaves your phone.
Private by architecture. Useful offline. No account required.
Closed testing
Get early access
Cairn is in closed testing on Google Play. Send us your Google account email and we'll add you to the internal track.
Request accessAndroid only. Requires a device with 8 GB RAM.