F2S vs fork ai
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
F2S
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Block social media until you can prove you've learned something. F2S intercepts your social media habit and turns it into a study session. When you open Instagram, TikTok, or any app you choose, F2S steps in with a quiz. Answer correctly by explaining concepts in your own words, and earn your scroll time. Fail, and try again. It's the Feynman Technique meets screen time control. HOW IT WORKS ⢠Upload your study notes, PDFs, or any learning material ⢠AI generates quiz questions from YOUR content ⢠When you try to open a blocked app, F2S intervenes ⢠Answer 3 voice-based questions by explaining concepts out loud ⢠Pass the quiz ā earn 15 minutes of scroll time ⢠Track your streak, daily stats, and average score WHY VOICE? Typing an answer is easy to fake. Speaking forces you to actually understand. The Feynman Technique says: if you can't explain it simply, you don't understand it. F2S puts that to the test every time you reach for social media. SMART LEARNING ⢠AI validates your spoken explanations in real time ⢠Spaced repetition brings back questions you struggled with ⢠Questions adapt to your study materials, not generic trivia ⢠Focus mode lets you drill specific topics before an exam BUILT FOR YOUR WORKFLOW ⢠Works with iOS Shortcuts for seamless app blocking ⢠Sign in with Apple ā no new account needed ⢠Cloud-synced across all your devices ⢠Clean, minimal design that stays out of your way START FREE Try F2S free for 3 days. See how much you learn when your scroll time depends on it. Privacy Policy: https://feynman2scroll.web.app/privacy.html Terms of Use: https://feynman2scroll.web.app/terms.html
fork ai
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Upload your lecture PDF and fork ai turns it into a mind map of notes. Then dig into any part of it: open a branch on the map, or tap a sentence and Ask AI about exactly that. Every question becomes a branch on your map, so you can find your place again. HOW IT WORKS ⢠Upload a lecture PDF (lecture slides saved as PDF are fine), a text file, a Markdown file or an image ⢠fork ai builds a mind map of notes from it ⢠Open any branch from the map to read it ⢠Tap a sentence, or highlight a passage, and tap Ask AI to ask about exactly that ⢠Each answer becomes a new branch on the map ⢠Mix several branches into one new answer with the Mixer KEEP AND SHARE YOUR WORK ⢠Highlight in colors and pin callouts ⢠Export a session to Notion as a structured page ⢠Share a session with a link. Anyone can read it without an account ⢠Choose the AI model for each branch ⢠Turn on web search to get answers with cited sources ⢠Get a notification when a long research run finishes BEFORE YOU UPLOAD ⢠fork ai reads up to 50 pages, or about 40,000 characters, of a file ⢠Scanned PDFs with no text layer are read by OCR: the first 10 pages only, and English only ⢠If a file was only partly read, the app tells you, so you can split it and upload the rest ⢠You need an account to upload. Sign-up is free CREDIT New accounts get a one-time $5 starting credit. AI answers use up credit. When it runs out, you can buy more inside the app.
Screenshots
Verdict
The clearest difference is ads: fork ai at none against F2S's shown. fork ai also leads on iOS requirement (15.0 vs 18.6). F2S's advantage is update cadence (every 3 weeks vs every 2 months). On price, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. F2S sells 2 in-app purchases, starting at $5.99 per month and fork ai sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
F2S ships an update every 3 weeks, fork ai every 2 months. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.
| Parameter | F2S | fork ai |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks ā better | Every 2 months |
| Ads | Yes | No ā better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad, iPod ā better |
| Requires iOS | 18.6 | 15.0 ā better |
| Further details ā not scored | ||
| Size | 57 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Destan Gokalp | Gokul Madathupalyam Chinnappan |
In-app purchases
F2S
- Monthly3 Days trial$5.991 Month
- Yearly3 Days trial$34.991 Year
fork ai
- $5 Credit$6.99
- $10 Credit$13.99









