Your lectures, handled.
Hit Record when class starts. By the time you close your laptop, Tentaku has clean notes, the moments you flagged, new flashcards, and your week’s study plan — all built by your own AI, with audio that never leaves your computer.
Free for one class, every feature · Every install starts with a 14-day Pro trial · Mac (Apple silicon and Intel) · Windows installer in final testing
Press Stop. Your brief is already there.
Key terms, worked examples, the moments you flagged and the announcements — on screen in seconds.
Key terms
- Unconditioned stimulus
- Conditioned response
- Positive reinforcement
- Reinforcement schedules
Worked example
Pavlov’s dogs: food (unconditioned stimulus) makes them salivate. Pair a bell with food enough times and the bell alone triggers salivation — the bell is now a conditioned stimulus.
⭐ You flagged · 31:12
“Classical conditioning pairs two stimuli; operant conditioning pairs a behavior with its consequence. That distinction is on every exam.”
“The midterm covers chapters 3–5.”
Due for review tomorrow
Works the same in every class you take:
- Organic Chemistry I · SN1 vs SN2
- Calculus II · Integration by parts
- Microeconomics · Price elasticity
- Intro Biology · Cellular respiration
- US History · Causes of the Civil War
- Intro to CS · Recursion
- Statistics · p-values
Everything a lecture can turn into
One app from the first day of class to the final.
In class
One-button recording
No bots, no meeting links, works in any lecture hall.
Live notes while you listen
Grounded only in what was actually said, refreshed every few minutes, with a live transcript that keeps up with the room.
Highlight
One tap flags what the professor just said; it gets its own spot in your notes. Flag one from any app with ⌘⇧H (Ctrl+Shift+H on Windows).
Catch me up
Zoned out? Three bullets on the last five minutes, instantly.
After class
Instant brief on Stop
Notes open before you’ve packed your bag. ✨ Day brief on multi-lecture days.
Flashcards from anything
Your notes, the textbook, the slides, any PDF; edit any card, skip any card.
Spaced review
Cards come back right before you’d forget (1 → 3 → 7 → 14 → 30 days).
Exam mode
Review only what your professor actually tests.
Your AI, your choice
Bring your own AI
One-click OpenRouter, or an API key from Anthropic, OpenAI or Google. Balanced is quick and inexpensive; Best uses a stronger model for lessons, drawings, Analyze and practice tests.
Ask in Claude, ChatGPT or Gemini
No key? Tentaku shows exactly what it will copy, lets you edit it, puts it on the clipboard and opens the AI app you already use. You paste and press send yourself.
Useful with no AI at all
Recording, on-device transcripts, search, highlights, your own flashcards (+ New card) and every export work without connecting anything. AI buttons just say “Connect an AI to use this”.
Organized for you
A hub per class
Lectures, documents, search, all in one page.
Drop anything, it sorts itself
Tentaku reads the file and files it: Homework, Syllabus, Tests, Slides, Readings (and you can always move it).
Built-in textbook viewer
Jump to any page or chapter; ask it “summarize pages 120–130” or “help me with problem 3”.
Downloads auto-filing (opt-in)
Off until you say yes. When on, course documents you download are filed into the right class by name, with an ↩ undo. Nothing leaves your computer.
Connected to your school
Any school calendar
Canvas, Blackboard, Moodle and Brightspace deadlines through the read-only calendar-feed link. No login, no password.
Professor’s course sites
Tentaku checks it for new PDFs and lists them on the class page with a ⤓ Get button.
Deadline check-off
Done is done; checked items leave your plan.
Phone calendar export
Your deadlines as a file Google or Apple Calendar imports. Flashcards export to Anki.
Priced like a textbook
Every install starts with a 14-day Pro trial — no card, nothing to cancel.
Free
$0
1 class, every feature, 3 recordings/week. Forever.
Pro — Semester
$29
One-time. Unlimited classes and recordings for one semester. No subscription.
Pro — Year
$49/yr
Best value. Cheaper than two semesters, includes summer.
Founding student
$29
First year, then $39/yr for life. First 100 students with a .edu email.
Private by architecture
- Audio never leaves your laptop. Recording and transcription happen on your machine, offline.
- Bring your own AI. One-click OpenRouter sign-in, or an API key from Anthropic, OpenAI or Google (pay-as-you-go, usually cents per lecture, separate from any ChatGPT Plus / Claude Pro subscription). Tentaku never meters, marks up, or resells AI.
- Keys are encrypted on your computer. Tentaku stores them scrambled with a key your operating system’s keychain protects, inside Documents/Tentaku.
- Your data is yours. Plain files in Documents/Tentaku; export, back up, or walk away anytime. No lock-in, ever.
- Never records on its own. You press the button, every time.
Built in public by a Columbia student
Tentaku started as the tool I wanted for my own lectures. Follow the build on X and the devlog.
Your next lecture, handled.
Free for one class. Every feature. Audio that stays on your laptop.