NewPaste a TikTok, Reel or any link
Make what you study stick.
Watching feels like learning. A week later, most of it is gone. Paste a lecture, a PDF, a YouTube video or a TikTok and Synapsi builds the study kit. Cards come back right before you'd forget. Explain it back, and the AI checks what stuck.
- 3-day free trial of Pro
- iPhone, Android and web
What powers the electron transport chain?
It's a loop in the matrix that strips carbons off, one turn at a time.
- YouTube
- TikTok
- X
- Any article
- Slides
- Ebooks
- Photos of notes
- Lecture audio
- Video files
One paste. A kit that sticks.
- 01
Paste anything
Record, upload a file, or paste any link: a YouTube video, a TikTok, an article, even a whole playlist.
- 02
Get the kit
AI builds a summary, mind map, flashcards, and quiz in about 60 seconds, all from your source.
- 03
Review on time
Real FSRS spaced repetition brings each card back right before you'd forget. Chat with your notes when you're stuck.
- 04
Explain it back
Feynman teach-back: say it in your own words, and an AI checks it against your source and finds the gaps.
Not just notes. Everything that makes them stick.
AI writes the notes
A clean, structured summary built straight from your source, with the transcript one tap away. Ready before you stand up.
Real spaced repetition
FSRS brings each card back right before you'd forget it, so the gaps actually close and review takes minutes.
Quiz yourself first
Questions from your own lecture, with the reason behind every answer. Find the gaps while they're still cheap.
Mind maps, drawn for you
Every concept in the lecture and how they connect, laid out as a map you can explore.
Feynman teach-back, judged by AI
Explain it back in plain English. Synapsi judges what you actually understand, surfaces the gaps, and writes cards for them.
Chat with your notes
Ask your lecture anything. Answers come from your source, not the open internet, and quote the passages they used.
Any link becomes a study kit
YouTube, TikTok, Instagram, Facebook, X, or any article on the web. Docs, slides, ebooks, recordings and photos of your notes too. Paste it, or search YouTube without leaving the app.
Import a whole course
Pick the videos from any YouTube playlist and get a folder of study kits, ready to learn in order.
Record any lecture
Hit record on your laptop. Synapsi keeps transcribing for hours, even if you switch tabs.
Share with one link
Send a read-only link to your study group. Nobody needs an account to read it.
Most apps make the flashcards. Synapsi makes sure you still remember them.
Each review lands right before you'd forget, so the memory curve stays flat. Explaining it back shows what you understand, not just what you recognise.
Illustrative, based on the forgetting curve and spaced-repetition research.
Rated 4.7 out of 5 by learners
19 ratings, asked right after a study round, a quiz or a mock exam. Real accounts, emails hidden.
- today
le••••@icloud.comUniversity student
Rated from the app
- 3 days ago
ka••••@icloud.comUniversity student
Rated after a practice round
- 12 days ago
Apple user
Rated after a practice round
- 13 days ago
ma••••@icloud.com
Rated after a practice round
- 13 days ago
ma••••@icloud.com
Rated from the app
- 2 weeks ago
Apple user
Rated after a review session
- 2 weeks ago
su••••@gmail.com
Rated after their first study round
- 3 weeks ago
“i wish to have friend list in here. make a room and we can study together. we can chat with friend too like discord. but overall i like this app. the plan is also really affordable. thank youu”
mimi
Rated from the app
- 3 weeks ago
34••••
Rated after a quiz
- 3 weeks ago
sa••••
Rated after a review session
- 4 weeks ago
ba••••@naver.comHigh-school student
Rated after a review session
- 6 weeks ago
ha••••@gmail.comUniversity student
Rated after their first study round
Start on your laptop, review on the bus.
On web, iPhone, iPad, Mac & Android. One subscription unlocks Pro on every device you sign in on. Your notes sync automatically.
Try it free, no signup
- YouTube transcript
- TikTok transcript
- Instagram transcript
- X (Twitter) transcript
- Flashcard generator
- AI summarizer
- Quiz generator
- Key points extractor
- Mind map generator
- PowerPoint to flashcards
- PowerPoint to quiz
- PowerPoint summarizer
- Handwritten notes to flashcards
- Image to text
- Study guide generator
- Reviewer maker
- PDF to EPUB
- PDF to text
- EPUB to PDF
- Merge PDF
- Split PDF
Try it free. Pro when it clicks.
Free
$02 free notes a month to try it.
- 1 note from any source, as a preview
- First summary section, 10 flashcards, 4 quiz questions, 5 concepts
- The rest of the kit is visible, locked
- Free study tools, 3 runs a day, no signup
- Most popular
Pro
$9.99/ month3-day free trial, then $9.99 / month. Cancel anytime.
- Unlimited notes, each with its full study kit
- AI chat, Feynman test & mind-map expand
- 50 MB uploads, full-depth kits
- Free tools with no daily cap
- Priority email support
New subscribers only. The trial needs a card on web. Cancel before it ends and you pay nothing.
Lifetime
$199onceEverything in Pro, forever. Same price everywhere.
- Everything in Pro
- All future features
- No subscription to manage
- Refundable for 30 days
No subscription? Buy lecture credits instead.
One credit processes one lecture: summary, mind map, flashcards, quiz, and Feynman test included. Credits never expire and work on the free tier. Same price everywhere.
Web prices, set for your region. App Store and Google Play prices are set by each store and can be higher. Full pricing
Things students ask
What can I paste into Synapsi?
YouTube, TikTok, Instagram, Facebook and X videos, any article or web page, Google Slides and Docs links, PDFs, PowerPoint and Word files, ebooks, text and Markdown files, subtitle files, photos of your notes, and audio or video files. You can also record a lecture live or type your own notes.
How does Synapsi help me remember what I study?
Two ways. FSRS spaced repetition brings each card back right before you'd forget it, so review takes minutes and the memory holds. The Feynman teach-back asks you to explain a concept in your own words, and an AI checks it against your source and finds the gaps. Reminders land on the day cards are due, so nothing slips.
How is Synapsi different from NotebookLM or Knowt?
They make the study material. Synapsi makes it stick. After the summary and flashcards, real FSRS spaced repetition brings each card back right before you'd forget it, and a Feynman teach-back has an AI check you can explain each concept in your own words. Most apps stop once the notes are written.
What is the Feynman test?
Explain a concept in plain English without looking back. Synapsi compares your answer to the source and shows what you got, what you almost had, and what you missed, then turns each gap into a flashcard for tomorrow. It's how you know it will stay, not just that you recognized it.
How does the free trial work?
You can try Synapsi free, no card needed. Pro starts with a free trial if you haven't had Pro before. On web, Pro is free for 3 days and checkout asks for a card. On iPhone and Android the trial runs through the App Store or Google Play. Cancel before it ends and you pay nothing, and Pro stays on until the trial is over.
Why is the price different in my country?
Pro is priced for each region, so students in more countries can afford it. This site shows the price for the country you visit from, and your account keeps the region it signed up in. Lifetime and credit packs cost the same everywhere.
What languages does Synapsi support?
Synapsi transcribes lectures in 90+ languages. The study tools it builds from them (summary, mind map, flashcards, quiz, and chat) work best in English, Mandarin, Spanish, and French.
How accurate are the AI summaries?
For lecture audio recorded on a normal laptop, transcription is reliable and the summary picks up the structure your professor used.
Can I use this on my phone?
Yes. There are native iOS and Android apps, and the web app works in any mobile browser. The same account syncs everywhere.
Is my data used to train AI?
No. Your recordings and notes are private to you and never used for training.
Do I have to subscribe?
No. Signing up is free and needs no card, and your first note is a real study kit from your own lecture. To open all of it, plus mind map, quiz, Feynman test, spaced repetition, and chat, start the free trial of Pro. On web the trial takes a card and renews as Pro unless you cancel. You can also buy lecture credits that never expire.
Walk into the exam still knowing it.
Paste your first lecture. The kit is ready before your coffee is.
