Tentaku for Mac — private beta

Tentaku for Mac is in private beta while we finish Apple’s signing and notarization. Leave your email and you’ll get the download the day it’s public.

Get the download the day it’s public

JavaScript is off — email help@tentaku.app with the subject ‘notify me’ and your platform.

Windows

Windows 10/11 (x64) — installer in final testing.

Windows on ARM runs the x64 installer under emulation.

System requirements

Mac

macOS 13 Ventura or newer · native builds for both Apple silicon (M-series) and Intel
About half a gigabyte of disk (the transcription engine is built in — nothing extra to install)
Recordings are kept as audio files, about 115 MB per hour of lecture, until you delete them. Keep a few GB free for a full semester.
Microphone permission, asked the first time you press ● Record

Windows

Windows 10/11, 64-bit (x64) — installer in final testing; join the list to get it first.
Import recordings, class packs and Back up everything are Mac features.

AI

Easiest: OpenRouter — sign in once, one account, every model.
Or an API key from Anthropic (Claude), OpenAI (ChatGPT) or Google (Gemini).
Advanced: a local model via a custom command (e.g. Ollama).
No AI account? Recording, transcripts, search and your own flashcards still work, and Ask in Claude / ChatGPT / Gemini uses an AI app you already have.
Typical cost on the default Balanced model: about 5–7 cents per lecture hour for automatic notes, which is most of the spend. A student recording 4 classes pays about $4 a month to their own AI provider (light use about $1.50, heavy up to about $9).
API keys are pay-as-you-go and separate from a ChatGPT Plus or Claude Pro subscription.

Internet

Internet is needed for AI note-writing, your school calendar feed, professor-site checks, OpenRouter sign-in and Pro license checks.
Recording and transcription are fully offline.

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.

The full list of what leaves your computer →