Centi: AI Lecture Recorder

Record your lecture. Centi turns it into a transcript, clear notes, flashcards and a quiz, all on your iPhone.

No account. No upload. No lost recordings.

NEVER LOSE A LECTURE Centi saves your audio every few seconds in pieces that stay readable even if your phone dies, the app closes or a call comes in. The next time you open Centi, the lecture is finished and transcribed. Recording keeps going with the screen locked, with a Live Activity on the Lock Screen and in the Dynamic Island so you can pause, bookmark or stop without unlocking.

TRANSCRIPTS THAT WORK OFFLINE Speech-to-text runs on your iPhone, so it works in airplane mode and in lecture halls with bad Wi-Fi. Long lectures are fine. Lock each course to its language so a Spanish class stays in Spanish.

NOTES YOU CAN TRUST After class, Centi writes structured notes with sections, key terms, definitions and formulas. Every note links to the exact moment in the recording, so you can tap and hear your professor say it. Math is shown as real equations, not broken symbols.

FLASHCARDS WITH SPACED REPETITION Centi makes flashcards from every lecture and schedules them with FSRS, a modern spaced repetition algorithm, so you review each card right before you'd forget it. Set your target retention and daily limits.

QUIZZES AND EXAM MODE Quiz yourself after every class. Exam mode mixes questions from any range of lectures and focuses on what you haven't seen or got wrong. Missed questions come back until you get them right.

ASK YOUR LECTURES Ask a question across a whole course and get an answer with citations that play the source moment.

ADD YOUR SLIDES Scan slides or handwritten notes with the camera, or import audio and video you already have.

ORGANIZED BY COURSE Courses, semesters, exam dates, a daily review queue, streaks and a Home Screen widget to keep you on track.

EXPORT ANYTHING PDF, Markdown, Anki decks, transcripts and audio. Your work is yours.

PRIVATE BY DESIGN Recording, transcription and study tools run on your device. There's no account to create and no server that stores your lectures. Your library syncs between your devices through your own iCloud.

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