NewPaste a TikTok, Reel or any link
Studied it? Prove it.
Watching feels like learning. It isn't. Paste anything, a lecture, a YouTube video, a TikTok, even a whole playlist, and Synapsi builds the study kit, grades how you explain it back, and drills the gaps until it sticks.
- 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 checks you.
- 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
Prove it
Feynman teach-back: explain it cold, and an AI finds what you only thought you knew.
Not just notes. Proof you learned them.
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 checks you learned them.
Reviewing right before you'd forget keeps the memory curve flat. Teaching it back proves you understand it, not just recognise it.
Illustrative, based on the forgetting curve and spaced-repetition research.
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
- Reviewer maker
- PDF to EPUB
- PDF to text
- EPUB to PDF
- Merge PDF
- Split PDF
Try it free. Pro when it clicks.
Free
$01 free note 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 is Synapsi different from NotebookLM or Knowt?
They make the study material. Synapsi checks you actually learned it. After the summary and flashcards, a Feynman teach-back has an AI judge whether you really understand each concept, and real FSRS spaced repetition keeps the gaps in rotation. Most apps stop at 'here are your notes.'
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 you learned it, not just 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.
Your next exam, handled.
Paste your first lecture. The kit is ready before your coffee is.
