Features

The notes are just the beginning.

One recording gets you the whole toolkit. Every word, transcribed and searchable. Study notes built for the exam. Cards that quiz you on what's about to slip. And a tutor that answers from what your professor actually said. All of it on your Mac. No subscription. Nothing uploaded.

Hit record. Then just listen.

Use your mic for an in-person class, or capture the sound playing on your Mac for an online one. While you record, a little red dot with a running timer lives in your menu bar, so you always know it's working, even with the window closed.

  • Your mic or your Mac's own audio: live classes, online classes, videos, calls
  • Menu bar timer with one-click stop, from anywhere on your Mac
  • Live level meter so you can see it's hearing the room
  • Step out without losing the thread: pause the recording and pick it back up in the same lecture: a break, a room change, a side conversation. It all comes back as one set of notes
  • Name the lecture while it records, or skip it and it names itself from what was said
  • A gentle nudge if the room goes quiet for a while ("still recording?"); it never stops on its own
LectureSync recording a lecture, with a running timer, a live audio waveform, pause and stop controls, the course's earlier lectures listed below, and an earlier lecture's notes open beside it.

Recording in progress: timer, level meter, and your course list.

Built like a black box

You cannot lose a lecture to bad luck.

A lecture only happens once. So LectureSync treats every recording like it's irreplaceable, because it is. Your audio is saved continuously while you record, not at the end.

Survives a crashIf the app (or your whole Mac) dies mid-lecture, you lose a couple of seconds at most. Next launch, it offers to pick up where it left off.
Survives a flaky micHeadphones die? Mic unplugged? Recording rolls right on and stitches itself back together. You do nothing.
Survives youQuitting or closing the window mid-recording is politely blocked until you stop or cancel: no accidental โŒ˜Q disasters.
Survives second thoughtsDeleted recordings go to the macOS Trash, not into the void. Changed your mind? Get it back.
Survives a moved fileThe files you drop in are looked after too. If an imported file later moves or you lose access to it, LectureSync tells you and helps you point it back, instead of quietly failing later.

Drop in anything. Get the same notes.

Recording live is optional. Drag a file (or a whole stack of them) onto a class and LectureSync takes it from there. Even straight out of Apple's Voice Memos.

  • Voice Memos, right from your iPhone: record the class on your iPhone or iPad, and when you're back at your Mac, drag the memo straight out of the Voice Memos app. The audio and its transcript come along in one drop
  • Audio files: the usual suspects, straight in
  • Video files: the audio is pulled out automatically
  • Transcripts & caption files: already have the text? It skips straight to notes
  • Smart re-drops: drop a file twice and it finds the existing lecture instead of duplicating it
  • Drop a whole folder: got a semester of recordings sitting in one folder? Drop the folder in and LectureSync sorts them into classes and lines them up to process, no one-at-a-time

Watch it happen: a Voice Memo dragged straight onto a class, and the notes start writing themselves.

Notes you can walk into an exam with.

Every lecture comes back as clean, organized Summary notes. And with the app's built-in models, you can go a step further: a full Study Guide built for exam prep, not just review.

What's in a Study Guide

  1. A short overview: the lecture in a few honest sentences
  2. Key concepts: each big idea explained, one at a time
  3. Facts, definitions & worked examples: exact numbers, names, and quotes kept word-for-word, never recalculated or paraphrased
  4. Likely exam questions: a handful of questions to test yourself with

Study Guide works with LectureSync's built-in note-writing models (and oMLX, if you run one). Other setups get the Summary style, and if a lecture's too short for a full guide, the app says so instead of padding it.

  • Equations come out right: calc and physics notes look like a textbook, even offline
  • Who said what (optional): turn on speaker labels and a seminar or Q&A reads like a script, handled on your Mac
  • Tell it about your class: a per-class context note (like "the professor loves exact terminology") shapes how your notes are written
  • Every take is kept: run the notes again and the new take stacks on as a version instead of replacing what you had. Flip through them side by side, mark the best one with the checkmark, and that's the keeper saved to your notes folder
A calculus lecture's notes in LectureSync's dark mode, with limit notation and fractions rendered like a textbook.

Real lecture math, rendered like a textbook, and it looks right at 9am or 2am. Try the switch.

Don't just reread it. Quiz yourself.

Any lecture can become a deck of study cards: a question on the front, the answer on the back, and under every answer, the exact words from the lecture it came from.

  • Every card has receipts: each card carries a word-for-word quote, checked against the transcript before it makes the deck. A card the lecture can't back up gets dropped, and the deck tells you how many were
  • Hear it from the professor: every card links to its moment in the lecture. "Show in Lecture" opens the transcript at the quote, and the play button starts the audio right there
  • You do the grading: in a study session you answer from memory first, then call it: Again, Hard, Good, or Easy. No scores from a machine
  • Review what's about to slip: one Review button per course gathers today's cards across all its lectures. Miss a card and it comes back sooner; nail it and it waits longer
  • An honest wrap-up: after a session you see what you actually recalled, how that compares with what you predicted, and which cards gave you trouble, each linked back to its moment

Cards are made with the same note setup you already use, fully on your Mac if that's how you run it. Re-transcribe a lecture later and its deck flags itself, with a one-click rebuild.

A physics lecture's Study tab in LectureSync showing a deck of 11 study cards; one card is opened to its answer, with the lecturer's word-for-word quote, a Show in Lecture link, and a play button.

A lecture's deck: flip a card and the professor's exact words are right under the answer.

Stuck on something? Ask the lecture.

Once a class is in, you can ask it questions in plain English and get answers from your own lectures, not the open internet, not a textbook it guessed at.

  • It only knows your class. Answers come from what was actually said in your lectures. If they don't cover it, it tells you instead of making something up
  • It teaches, not just tells. Close to the answer? It nudges you with a question. Properly stuck? It gives it to you straight
  • Every answer shows its work. Each reply links back to the exact moment in a lecture it came from: click to jump there and hear it
  • It stays on your Mac. Same on-device setup as your notes; your questions don't leave the machine
LectureSync's Course Assistant in a back-and-forth about a physics lecture, answering from the student's own recordings, nudging with follow-up questions, and citing each answer with chips that link to timestamped lecture moments.

Ask in plain English; each answer links back to the moment it came from.

The full transcript, not just the notes.

Every lecture keeps its complete transcript right alongside its notes, nothing thrown away once the summary is written.

  • Search the whole thing: type a word and every place it was said lights up, so you can find that one definition fast
  • Timestamped line by line: click any line to jump the audio straight to that exact moment and hear it again
  • The source, word for word: when the summary isn't enough, the raw transcript is right there to check
A physics lecture's full transcript open in LectureSync with a search box above it; each paragraph is timestamped and can be clicked to seek the audio.

Search the transcript, then click any line to jump the audio right to it.

Private by design

Everything runs on your Mac.

Out of the box, everything (recording, turning speech into text, writing the notes) happens on your computer. No account. No sign-in. No tracking inside the app. Once its models are downloaded, it works with the Wi-Fi off. Cloud AI exists only if you turn it on, with your own key, and your pick of provider, and your key lives in the Mac's own secure Keychain.

On your Macrecording โ†’ text โ†’ notes
Works offlineonce models are downloaded
No accountand no tracking in the app

Read the privacy policy โ†’  ยท  See which models we recommend โ†’

Your notes are files in your folder.

Notes land in a folder you choose, as plain files any notes app can open, designed to drop straight into an Obsidian vault, sorted into a folder per class with tidy dated filenames.

  • It never overwrites your edits. Polish a note in Obsidian and LectureSync notices; it won't touch that file again unless you explicitly tell it to
  • Rename or move a note? It keeps track and stays linked
  • Works with synced vaults, including iCloud
  • Delete a lecture in the app, keep the note: your saved notes are never the casualty
A LectureSync study note open in an Obsidian vault, filed under semester and course folders, with its equations rendered.

The finished note at home in Obsidian, yours to edit, tag, and keep.

It sets itself up. You just say yes.

No menus to decode on day one. LectureSync checks what Mac you have and recommends the right note-writing setup for it: you see the download size up front, watch the progress bar, and you're done. Setup only finishes when everything's actually ready to record. The first time you open the app, a short walkthrough gets transcription and notes set up and leaves you a sample lecture to look around, so you see real notes before you record your first class.

  • Best-quality path: one recommended download, matched to your Mac (about 5 GB; a bigger option exists for big-memory Macs)
  • Quick-start path: on macOS 26 or later, Apple's built-in intelligence writes notes instantly, nothing to download (expect lighter notes)
  • Already run local AI? Ollama, LM Studio, and oMLX are spotted automatically; one click to connect
  • Cloud, if you want it: plug in OpenAI, Anthropic, xAI (Grok), or OpenRouter with your own key; see our tested picks
  • Lectures in other languages? Detected automatically, or set per class
LectureSync's model picker showing curated top picks for notes.

Choices stay curated: the app surfaces good picks, not a wall of options.

A whole semester, organized without trying.

Tags, folders, and a Recent list keep a whole semester of lectures findable, and a lot of it happens on its own while the notes are being written.

  • Tag a lecture, find it later. Put labels like "exam," "lab," or "week 3" on any lecture. LectureSync can also add tags for you while it writes the notes, so leave it on and your lectures sort themselves
  • Group your classes into folders. Bundle related courses together and collapse the ones you're not working on this week
  • Smart folders fill themselves. Make a folder like "Exam prep" that gathers every lecture carrying a tag you pick, and keeps gathering them as you tag more
  • Pick up where you left off. A Recent list keeps your latest lectures one click away, whatever class they're in
LectureSync's sidebar with courses grouped into semester folders, a smart folder that gathers every lecture carrying a chosen tag, and a Recent list; the smart folder is open, showing its tag rule and the matching lectures from several courses.

The sidebar: course folders, a self-filling smart folder, and Recent, all in reach.

Every class gets its own setup

Its own icon and color, its own notes folder, its own settings. Set once, forget forever.

Every lecture shows its status

A live badge on each one (recorded, in line, being written up, done), so nothing silently stalls.

Notes write themselves in the background

Lectures process one by one in the background with a progress bar at the bottom. Reorder the line, cancel something, or just let it run.

Looks right at 9am and 2am

A true Mac app: light mode, dark mode, or follow the system. Notes (and their math) adapt too.

Duplicate a lecture. Try anything.

Transcript, notes and all: try a different style or model on the copy without touching the original.

Redo anything. Keep every take.

Redo the transcript from the saved audio, or take another pass at the notes; every pass is kept as its own version.

Before you ask

Does my audio go to the cloud?
Not unless you send it there. By default, transcription and note-writing both happen on your Mac. Cloud AI is strictly opt-in: your own account, your own key, your chosen provider. And there's no account, sign-in, or tracking in the app itself.
Does it work offline?
Yes. Once the on-device models are downloaded, recording, transcription, and notes all work with no internet at all.
Can I ask questions about my lectures?
Yes. After a class is transcribed, open the assistant and ask in plain language. It answers only from your own lectures and links each answer back to the moment it came from. Like everything else, it can run entirely on your Mac.
Can I search across all my lectures?
Yes. One search box looks inside every transcript, note, and study card across all your classes. Click a result and it takes you straight to the spot. (That's plain text search for the exact words. When you'd rather ask a question and get an explanation, that's the assistant, just above.)
Can it quiz me before the exam?
Yes. Any lecture can become a deck of study cards: question on the front, answer and the professor's exact words on the back, with a play button that starts the audio at that moment. You grade yourself (Again, Hard, Good, or Easy), and each course's Review round brings back the cards you're about to forget first. Cards the lecture can't back up word-for-word never make the deck.
Can I record lectures on my iPhone or iPad?
Yes. Record the class in Apple's Voice Memos app on your iPhone or iPad. With iCloud, the recording shows up in Voice Memos on your Mac on its own; drag it from there straight into LectureSync. The audio and its transcript come over together, and your notes are generated like any other lecture.
Will it work on my Mac?
It needs macOS 26 or later on an Apple Silicon Mac. That's where the recommended models and the newest Apple features live, including Apple's instant built-in notes.
How much disk space do the models take?
Honest numbers: roughly 0.5โ€“3 GB for speech-to-text (you pick the quality tier), and about 5 GB for the note-writing model, or ~17 GB for the bigger option on high-memory Macs. The app recommends one for your hardware and shows the size before anything downloads.
What if I don't like the notes it wrote?
Run it again. Every generation is kept as its own version; a small bar above the notes flips through them so you can compare takes side by side. Mark the best one with the checkmark and it becomes the keeper saved to your notes folder. Toss the misses to the Mac's Trash, where you can still fish them out, and there's no cap on how many versions you keep. Each version also remembers how and when it was made, handy when you're comparing setups.
What happens if I edit a note afterward?
LectureSync notices your edits and backs off. It will never overwrite a note you've touched unless you explicitly click "Overwrite."
Am I allowed to record my lectures?
That depends on your school and where you live; it's your responsibility to check the rules that apply to you. The app shows a reminder about this the first time you record, and our privacy policy covers it too.

Your next lecture can write its own notes.

Record it, drop it in, or paste the transcript, then walk away with study material that's actually yours.

$9.99 on the Mac App Store, running entirely on your Mac.