Knowt has grown rapidly as an all-in-one study platform, combining flashcards, note-taking, AI quiz generation, and spaced repetition into a single app. It positioned itself as the free Quizlet alternative and attracted over 5 million users with a generous free tier and AI-powered study tools.
Sticky takes a more focused approach. Instead of bundling every study tool into one platform, it does two things: uses AI to create flashcards from your notes instantly, and schedules your reviews with the SM-2 spaced repetition algorithm.
Both apps use AI to reduce the friction of studying. But they are designed around different philosophies: Knowt gives you an all-in-one study suite with flashcards, notes, quizzes, and AI tools, while Sticky gives you a focused flashcard experience with proven spaced repetition scheduling. Here is where they differ and where each one wins.
Quick Verdict
you want an all-in-one study platform that combines flashcards, note-taking, AI quizzes, and community content in a single app — especially if you study across multiple formats.
you want AI to create flashcards from your own notes instantly and prefer a focused, ad-free spaced repetition experience with proven SM-2 scheduling.
What Is Knowt?
Knowt is an AI-powered study platform founded in 2019 by Abheek Pandoh, Abhishek Patel, and Daniel Like. It combines flashcard creation, note-taking, AI quiz generation, and spaced repetition into a single platform available on iOS, Android, and web.
Knowt's core pitch is breadth. You can create flashcards manually, generate them with AI from PDFs, lecture videos, or notes, take practice quizzes, use a built-in note editor, and browse millions of user-created study sets. It also offers a voice-based AI study mode called "Call with Kai" where an AI tutor quizzes you on your material. Knowt saw 700,000 users during the May 2025 AP exam season alone, and has crossed 5 million total users.
The free tier is genuinely generous — unlimited flashcard creation, Learn Mode, and Spaced Repetition mode are all included, though with ads and monthly AI usage limits.
What Is Sticky?
Sticky is an iOS flashcard app that strips studying down to two steps: create cards with AI, then review them on a schedule backed by the SM-2 algorithm.
Rather than bundling notes, quizzes, and tutoring into one platform, Sticky stays focused on the active recall loop. Photograph your lecture notes or paste text, and the AI generates question-answer flashcards in seconds. From there, the spaced repetition engine takes over — tracking your performance card by card and surfacing material right before you would forget it. No ads interrupt the session, and no monthly AI limits slow you down during exam season.
Knowt Features vs Sticky: Side-by-Side Comparison
Here is how Knowt and Sticky compare across the features that matter most for studying.
| Feature | Knowt | Sticky |
|---|---|---|
| Spaced repetition | Forgetting curve-based, free | SM-2 algorithm, built into every review |
| Card creation | Manual, AI from PDFs/videos/notes | AI from photos, text, and voice, plus CSV import |
| AI features | Quiz gen, lecture summary, AI tutor (Kai) | Photo to Card, Note to Card (included) |
| Study modes | Learn, Spaced Rep, Practice Test, Match | Spaced repetition review, quiz mode |
| Note-taking | Built-in editor (Notion-like) | No |
| Community content | Millions of user-created sets | Curated subject decks |
| Platforms | iOS, Android, web, Chrome extension | iOS |
| Ads | Yes (free tier) | No ads on any tier |
| Pricing | Free with limits, Ultra from $10.99/mo | Free with premium options |
Knowt Spaced Repetition vs Sticky: Breadth vs Depth
Both Knowt and Sticky include spaced repetition, but they implement it differently.
Knowt's Spaced Repetition mode is based on the Ebbinghaus forgetting curve. Cards move through three states — Learning, Almost-Graduated, and Graduated — based on your self-ratings of Again, Hard, Good, or Easy. The system calculates daily review targets and tracks "Days Late" if you miss sessions. It is a solid implementation that is available for free.
Sticky uses the SM-2 algorithm, the same system originally developed for SuperMemo and validated by decades of cognitive science research. When you review a card and rate it Easy, Medium, or Hard, the algorithm calculates a specific next review date based on your individual history with that card. Each successful recall increases the interval between reviews.
The practical difference is that Knowt's spaced repetition is one mode among many — you might also use Learn Mode, Practice Tests, or Match in the same session. Sticky's entire experience is built around spaced repetition. Every review is scheduled by the algorithm, and the app is designed to make daily spaced repetition reviews as frictionless as possible.
If you want spaced repetition as part of a broader study toolkit, Knowt includes it alongside other modes. If you want spaced repetition to be the core of your study routine — which research suggests is the most effective approach — Sticky's focused implementation may serve you better.
Knowt AI Features vs Sticky: Study Suite vs Focused Card Creation
Both apps use AI, but in fundamentally different ways.
Knowt offers a broad AI toolkit: generate flashcards from PDFs, lecture videos, YouTube links, and notes. Generate practice quizzes from any uploaded content. Summarise lectures automatically. Have a voice conversation with Kai, an AI tutor that quizzes you and explains concepts. The breadth is impressive — Knowt is trying to be your complete AI study assistant.
Sticky's AI is focused on one thing: turning your study material into flashcards. Take a photo of your lecture notes, handwritten pages, or textbook, and the AI extracts key concepts and generates question-answer pairs. Paste text and get cards. Use voice input and get cards. Every AI feature flows into the same output: flashcards ready for spaced repetition review.
The trade-off depends on how you study. If you want AI to help you across multiple study activities — note summarisation, quiz creation, conversational tutoring — Knowt covers more ground. If you want AI to do one thing exceptionally well and feed directly into a proven review system, Sticky's focused approach means less setup and more actual studying.
It is worth noting that Knowt's broader AI features come with monthly usage limits on the free tier. Heavy users may hit those limits during exam season. Sticky's AI card creation is included without usage-based restrictions.
Knowt Pricing vs Sticky: What You Actually Pay
Knowt's free tier is generous — unlimited flashcard creation, Learn Mode, Spaced Repetition mode, and basic AI generation are all included. The catch is ads, which users report can be intrusive and affect performance, plus monthly limits on AI features.
Knowt paid plans:
- Student Basic: ~$5/month or ~$35/year
- Student Ultra: $19.99/month or $10.99/month annually (~$120/year)
- Teacher Ultra: $12.99/month or ~$96/year
Sticky is free to download with core features included — AI card creation, SM-2 spaced repetition scheduling, and no ads on any tier.
For students on a budget, both apps offer meaningful free tiers. The key difference is the ad experience: Knowt's free tier includes ads that can disrupt study sessions, while Sticky is ad-free across all tiers. If you find ads distracting during focused study time, this is a meaningful quality-of-life difference.
Who Should Use Knowt
Knowt is a strong choice if:
- You want an all-in-one study platform. If you prefer having flashcards, notes, quizzes, and AI tools in a single app rather than switching between multiple tools, Knowt's breadth is its strength.
- You study from video lectures. Knowt's ability to generate flashcards and summaries from YouTube videos and lecture recordings is unique and genuinely useful for college students.
- You want community content. Knowt has millions of user-created flashcard sets, which is helpful if you want to study from existing material rather than creating your own.
- You study on multiple platforms. Knowt works on iOS, Android, web, and has a Chrome extension, making it accessible from any device.
- You are switching from Quizlet. Knowt's Chrome extension makes importing Quizlet sets straightforward, and its free tier covers features that Quizlet now paywalls.
Who Should Use Sticky
Sticky is a strong choice if:
- You want to study your own material without hours of card creation. If you have lecture notes, textbook pages, or handwritten notes, Sticky turns them into flashcards in seconds with AI.
- You want proven SM-2 spaced repetition. Sticky uses the same algorithm validated by decades of research, with zero configuration required.
- You want an ad-free study experience. Sticky has no ads on any tier, which means uninterrupted focus during study sessions.
- You prefer depth over breadth. Instead of juggling multiple study modes, Sticky focuses on the two things research shows matter most: effective flashcard creation and spaced repetition scheduling.
- You study on the go. Sticky's camera-to-card workflow is built around how students actually capture information: in class, at a desk, on a commute. It also offers curated decks for popular subjects like AP Biology and Spanish vocabulary if you want a head start.
Is Sticky the Best Knowt Alternative?
Knowt and Sticky represent two different philosophies in study app design. Knowt is a broad platform that tries to be your complete study toolkit — flashcards, notes, quizzes, AI tutor, and community content all in one place. Sticky is a focused tool that does two things exceptionally well: AI card creation and spaced repetition scheduling.
If you want a single app that covers every study activity and you do not mind ads on the free tier, Knowt's breadth is impressive. If you want to turn your notes into flashcards fast and review them on a scientifically proven schedule without distractions, that is exactly what Sticky is built for.
Many students find that having too many study modes leads to time spent choosing how to study rather than actually studying. Sticky removes that decision: create cards, review on schedule, build long-term memory. The simplicity is the point.
Weighing other alternatives? See how Sticky compares to Quizlet, Anki, and Brainscape, or explore more study guides and learning science to find the method that works best for you.
