Knowt vs Debugging
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Knowt
This study app uses AI to transform notes and lecture videos into flashcards and practice tests. It offers various study modes, including spaced repetition, and provides free AP exam study guides. Millions of student-created resources are available.
- AI flashcard maker
- Summarize lecture videos
- Create practice tests from notes/PDFs/videos
- Free Learn Mode with multiple study modes
- Spaced Repetition algorithm
- Free AP Study Guides
- Sync across mobile and web
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Discover a new way to study with Knowt, the all-in-one study app trusted by 7 million students. On top of being the #1 Flashcard App with Free Learn mode, Knowt also has unique AI features designed to save you time when studying. With one click, turn your notes into flashcards, or ask our AI to summarize your lecture videos and whip up flashcards on the key info for you. Knowt creates practice tests from any note, pdf, or video to help you prepare for exams. We offer a more efficient way to study, join us and take your learning to the next level with Knowt. What can you do on Knowt? Make flashcards sets: Use our AI flashcard maker to create your own set or grab some from popular sites like Quizlet. Turn your notes into flashcards and practice : Upload your notes and let our AI makes flashcards and practice tests to help you learn the material better. Study with Free Learn Mode : Master your flashcards with unlimited rounds of learn mode or one of our other study modes (Practice Test, Match, Spaced Repetition) Efficient note-taking: Use our AI note-taking feature to take notes faster Spaced Repetition : Nail your tests with our scientifically proven algorithm that helps you remember your flashcards longer Free AP Study Guides : Check out the Exams Tab for free AP exam study guides, flashcards, and practice tests. (We're adding more exams soon!) Explore Free Learning Resources: Choose from millions of digital flashcard sets, class notes, study guides, and pdfs on a wide range of subjects, all created by fellow students. Seamless Sync: All your stuff syncs between the mobile app and website, making it easy to pick up where you left off, regardless of the device you're using. --------- Download the new Knowt App today and take your notes & flashcards wherever you go. Improve your grades and unleash the power of AI to learn better & faster. Terms of Service : https://knowt.com/terms Privacy Policy : https://knowt.com/privacy --------------------------- Join the Knowt Community! Discord: https://knowt.com/discord TikTok: https://www.tiktok.com/@getknowt Instagram: https://www.instagram.com/getknowt --------------------------- We are committed to protecting your personal information and your right to privacy. If you have any questions or concerns about our practices with regard to your personal information, please contact us at contact@knowt.com
Debugging
Practice debugging skills in a fun arcade platformer. Solve real AP Computer Science exam questions to fix glitches and escape a corrupted machine. Features multiple difficulty levels and offline play.
- Debugging practice arcade platformer
- AP CSP & CSA modes
- Multiple difficulty levels
- Collectible bugs with multiple-choice questions
- Offline play, no account required
- Built for phones and tablets
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Debugging: Inside the Machine is a free debugging-practice arcade platformer for students preparing for AP Computer Science Principles or AP Computer Science A. You're inside a corrupted machine — find the USB Key, fix the glitches, and escape the firewall before the system collapses. CSP and CSA modes ship in the same app. Tap once to switch. — EASY · MED · HARD — Each difficulty is a different level, with its own glitch tilemap and its own question bank. CSP topics: Selection, Iteration, Functions & Lists. CSA topics: Variables · Strings, Iteration · Loops, Arrays · Recursion. Two bonus levels (K-Pop Demon Hunters, Minecraft) unlock when you've cleared all three difficulties. — CODE LENS — Glitches scatter across each level as collectible bugs. When you're in range, the CODE LENS button pulses on screen. Tap it and a real multiple-choice debugging question appears: read the broken code, pick the actual bug from four explanations, and the glitch repairs. Wrong answer? Stability drops 10 percent. Right answer? Stability recovers 5 percent and the level inches closer to stable. — Real questions, not filler — Every question is hand-written and scoped to AP exam topics. No random AI hallucinations, no off-curriculum trivia. The pseudocode reference card (CSP) and Java Quick Reference (CSA) are one tap away during any question. — Built for phones and tablets — Touch controls only. Bottom-left D-pad to move, big JUMP button on the right, hold for higher jump. Question screens use full-size answer buttons. Designed for landscape iPhone and iPad. — Offline, no account, no tracking — Everything ships in the app. The game makes zero network calls, collects zero analytics, and requires no sign-in. — More from CS++ — A "More from CS++" button connects you to the rest of the CS++ family: the AP CSP and AP CSA full-curriculum apps, the CS++ Java IDE for on-device Java practice, and the free csplusplus.com web resources (curriculum, vocab trainer, practice exams). For: AP CSP and AP CSA students, CS teachers building exam prep sessions, anyone who likes finding bugs.
Screenshots
Verdict
The clearest difference is review sentiment: Debugging at 100% against Knowt's 62%. Debugging also leads on in-app purchases (none vs 32) and update cadence (daily vs weekly). Knowt's advantage is ratings volume (11K vs 5) and chart position (#77 vs unranked). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Knowt sells 27 in-app purchases, starting at $5.99 per month. Debugging asks for nothing beyond the download.
Debugging holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Knowt has 11K ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 62% of Knowt's written reviews are positive against 100% of Debugging's.
Knowt ships an update weekly, Debugging daily. The most recent releases landed on October 29, 2026 and October 16, 2026 respectively.
| Parameter | Knowt | Debugging |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (11K ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 61.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 11K — better | 5 |
| Update frequency | Weekly | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #77 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 150 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Knowt Inc. | Kevin Hare |
Customer experience
Knowt
Debugging
Bugs and requests
Knowt
Reported bugs
4 issues- Flashcards disappearing or duplicating
- Incorrect answers marked as correct
- Freezing on update screen
- Compatibility issues on certain devices
Requested features
6 requests- Split screen support for iPad
- Ability to manually sort flashcards
- More formatting options for flashcards
- Improved AI-generated notes
- Offline study mode
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- Customizable audio/visual feedback
Debugging
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Knowt
- Student Plus Monthly3 Days trial$5.991 Month
- Student Plus Monthly3 Days trial$7.991 Month
- Teacher Plus Monthly7 Days trial$7.991 Month
Show 24 moreShow fewer
- Student Ultra Weekly$9.997 Days
- Student Ultra Monthly3 Days trial$12.991 Month
- Teacher Ultra Monthly7 Days trial$12.991 Month
- Student Ultra Monthly3 Days trial$14.991 Month
- Teacher Ultra Monthly7 Days trial$14.991 Month
- Student Ultra Monthly3 Days trial2 variants$19.991 Month
- Student Ultra Monthly7 Days trial$19.991 Month
- Student Ultra Monthly$19.991 Month
- Teacher Ultra Monthly3 Days trial$19.991 Month
- Student Plus Annual3 Days trial$23.991 Year
- Student Ultra Monthly$24.991 Month
- Teacher Plus Annual7 Days trial$35.991 Year
- Teacher Ultra Annual7 Days trial$47.991 Year
- Student Ultra Annual3 Days trial2 variants$59.991 Year
- Teacher Ultra Annual$59.991 Year
- Student Ultra Annual3 Days trial2 variants$95.991 Year
- Teacher Ultra Annual7 Days trial$95.991 Year
- Student Ultra Annual3 Days trial2 variants$119.991 Year
- Student Ultra Annual$119.991 Year
- Student Ultra Annual7 Days trial$119.991 Year
- Student Ultra Annual14 Days trial$119.991 Year
- Teacher Ultra Annual3 Days trial$119.991 Year
- Student Ultra Annual7 Days trial$149.991 Year
- Student ultra annual3 Days trial$149.991 Year
Debugging
No in-app purchases









