Lecsy for iPhone
Keep up with English lectures.
Record any English class on iPhone. Your first 3 hours run on Premium AI — high-accuracy English, live captions. After that, free offline English keeps going. Read the AI summary in your native language. Free to start — Pro optional ($9.99/mo, 7-day free trial).
3 hours Premium AI on us · .m4a stays on your iPhone · No ads, no trackers
What Lecsy does
From class to study notes
in three taps.
Tap once.
Don't miss a word.
Open Lecsy, tap record. Keeps running with the screen locked, in the background, all the way through a 90-minute class.
- Background recording, screen-locked
- Bookmark important moments mid-class
- Audio file saved only on your iPhone
Premium AI
for your first 3 hours.
Lecsy starts with 3 hours of Premium AI — high-accuracy English, live captions, academic terminology handled. After that, on-device English (WhisperKit tiny.en) keeps you covered offline. All free.
- Premium AI: high-accuracy English transcription
- Offline fallback in English (lecture-hall Wi-Fi safe)
- Tap any sentence to jump in audio
This lecture covered the mechanism of cell division and how it functions in the development of multicellular organisms, with particular focus on mitosis and meiosis.
Notes you can
actually study from.
Tap once for an AI summary, key terms, and likely exam questions — in the language you read fastest.
- AI summary with key points & definitions
- Exam Mode: likely Q&A from the lecture
- Read on iPhone or laptop at lecsy.app
この講義では細胞分裂のしくみと、多細胞生物の発生における役割を扱いました。 特に有糸分裂と減数分裂のちがいに焦点が当てられています。
- • 有糸分裂 = 同じ DNA をもつ娘細胞 2 つ
- • 減数分裂 = 配偶子をつくる、染色体半減
- • チェックポイントが分裂の品質を担保
Compare and contrast mitosis and meiosis. Why does meiosis halve the chromosome count?
Privacy
Your recording file
stays on your iPhone.
The .m4a file never leaves your phone. During the Premium AI hours, the live audio stream is processed in the cloud for real-time transcription and is never stored by Lecsy. No ads. No trackers. No IDFA.
Audio file (.m4a)
Stays on your iPhoneThere is no code path that uploads the saved audio file. Not to our servers, not to OpenAI, not anywhere.
Live audio stream
Cloud during Premium AIDuring your first 3 hours of Premium AI, the live PCM stream is processed in the cloud for real-time transcription and is never stored by Lecsy. After those hours are used up, the stream stays on-device (English fallback).
Transcript text
Synced if signed inOptional cloud sync so you can recover transcripts if you lose your phone. Toggle off anytime.
AI Summary & Exam Mode
Text only, on demandWhen you tap the button, only the transcript text goes to GPT-4o-mini. Audio is never sent.
Ads, trackers, IDFA
NoneNo ad SDKs. No third-party analytics. No IDFA tracking. We don't sell your data.
Everything in one place
Built for how students actually study.
AI Summaries
Key points, outlines, and definitions written in the language you study in.
Exam Mode
AI generates likely test questions with model answers, straight from your lecture.
Offline fallback (English)
When Premium AI is unused or you're offline, Lecsy keeps transcribing English on-device — lecture-hall Wi-Fi safe.
Summary in your language
Lecsy transcribes the English lecture, then generates the AI summary in your native language — Japanese, Spanish, French, German, and more. Understand the class at your own reading speed.
Synced playback
Audio and text move together. Tap any sentence to jump. 0.75× to 2× speed.
Web sync
Read on your laptop at lecsy.app. Search across your entire lecture library.
Pricing
Free to start.
Lecsy is free to start. Every new user gets 3 hours of Premium AI (high-accuracy English, live captions). After that, offline English transcription, native-language summaries, and Exam Mode keep going — at no cost. Pro is an optional upgrade ($9.99/mo, 7-day free trial) for more Premium AI cloud transcription.
3 hours of Premium AI, then free offline English. Pro optional ($9.99/mo, 7-day free trial).
FAQ
Questions, answered.
Is my data safe?
Your audio file (.m4a) is always saved only on your iPhone — there is no code path that uploads it. During the 3-hour Premium AI intro, the live audio stream goes over an encrypted TLS connection to our speech-to-text engine for real-time transcription and is never stored by Lecsy. After those hours are used up, transcription runs entirely on-device (WhisperKit, English), so audio never leaves your iPhone. Transcript text syncs to our cloud only if you sign in. AI features send transcript text only (never audio) to OpenAI.
Do I need internet to record and transcribe?
Recording is always offline. The Premium AI transcription (your first 3 hours) streams audio to our speech-to-text engine in real time, so it needs Wi-Fi or cellular. After those hours are used up, transcription runs on-device (English) and works without internet.
What languages are supported?
Lecsy transcribes English lectures. Premium AI (your first 3 hours) delivers high-accuracy English, and the on-device fallback after that keeps transcribing English offline. AI summaries can be generated in your native language: record the lecture in English, read the summary in Japanese, Spanish, French, German, and more.
How accurate is the transcription?
During the 3-hour Premium AI intro, Lecsy uses high-accuracy cloud transcription for English — high accuracy for clear English lecture audio, even for non-native speakers, with stable handling of academic, medical, engineering, and legal terminology. After those hours are used up, the on-device fallback (WhisperKit tiny.en, English) handles everyday English well but is less reliable on specialised vocabulary and long lectures.
Is it legal to record lectures?
In most US and UK universities, recording lectures for personal study is permitted. Many schools actively encourage it as an accessibility tool. Always check your specific university's policy.
What iPhones are supported?
Any iPhone running iOS 17.6 or later. iPhone 12 and newer recommended for best transcription speed.
Is Lecsy free to start?
Yes — Lecsy is free to start. Every new user gets 3 hours of Premium AI English transcription (high accuracy, live captions) — sign in with Apple or Google, no credit card. After those 3 hours, you keep using Lecsy for free with on-device English transcription, native-language AI summaries, and Exam Mode. Pro is an optional upgrade ($9.99/mo with a 7-day free trial) if you want more Premium AI cloud transcription.
What data goes to OpenAI?
Only your transcript text, and only when you tap the AI Summary or Exam Mode button. The audio file is never sent. OpenAI does not use API content to train its models.
Never miss a word.
Record, transcribe, and ace your exams. 3 hours of Premium AI on us.
Download on the App Store