Knowunity vs Astra AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Knowunity
This AI-powered learning companion helps students prepare for exams and master subjects. It creates personalized study plans with flashcards, quizzes, and mock tests, and offers homework assistance by explaining problems step-by-step. Users can also access shared study materials from a large student community.
- Personalized AI study plans
- Flashcards and quizzes
- Step-by-step homework help
- Voice recall and tutor chat
- Mock exams with AI scoring
- Community-shared study notes
- Gamified learning with streaks
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Hey, I'm Knowie - your new way of learning. Whatever you're working on, I'll help you understand it, remember it, and walk into your next SAT, ACT, or AP feeling ready. 30 million students already study with me, I am created by the best students and the core tools are free. This is a the new way of learning - here is how we do it. Everything runs through one place: your exam plan. Instead of a pile of separate features, I pull it all together - flashcards, quizzes, summaries, mock exams, voice practice, and the official SAT, ACT, and AP guidelines - and structure it into a day-by-day plan built around your test date and your topics. Your exam plan, made with you. Tell me when your test is and what you need to cover, and I'll map out exactly what to do each day, with the right notes and flashcards for your course. Add your class timetable and I'll fit study around your lessons - no all-nighters. As the test gets closer the plan adapts, and you always see what you've got down and what's next. Study that actually sticks - active recall. Rereading feels productive but fades fast, so your plan is built around active recall: pulling answers out of your own memory. Quizzes and flashcards ask you to remember, not just recognize, and mastery tracking shows each topic move from shaky to solid. Just say it out loud. This is where voice comes in. With voice recall in your plan, you say your answer from memory and I check it with you - hands-free, out loud, the way real recall works. And in chat, switch on voice mode to talk to me like a tutor: ask anything, no typing needed. Stuck on homework? Snap a photo of any problem - math, chemistry, physics, biology - and I'll walk you through it step by step, so you get the how, not just the answer. Keep a separate chat for each class so nothing gets mixed up. Turn anything into study material. Upload PDFs, slides, photos, or handwritten notes, paste in text and links, bring your old flashcard decks, or drop in a YouTube video - I'll turn it into flashcards, quizzes, and clean summaries in seconds, ready to slot straight into your plan. Need vocab for a language class or a clearer essay outline? I've got you there too. Practice like it's the real thing. Take full, AI-scored mock exams in real SAT and AP format and see where you stand before test day - then I fold the results back into your plan, so you review exactly what needs work. Learn from real students. Browse over 1 million notes, summaries, and past-paper solutions shared by students in your subject and grade - right alongside everything we make together. Keep your streak going. Earn XP as you study, join a weekly league of up to 30 classmates, and climb from Bronze to Gold. A little friendly competition to keep you coming back. I'm built for every subject - AP courses, Math, Sciences, Social Studies, English, World Languages, Computing, and SAT and ACT prep. Whether you're cramming tonight or planning weeks ahead, we'll get you there - and the core tools are always free. Ready when you are. Download Knowunity, and let's study smarter, not harder. TOS: https://knowunity.com/legal/tos
Astra AI
This AI-powered study assistant provides instant, step-by-step guidance for subjects like math, physics, and chemistry. It offers features for homework help, exam preparation, and in-depth subject exploration, adapting to your learning pace.
- AI-powered step-by-step solutions
- Snap and solve homework
- Personalized exam study plans
- Curriculum-aligned lessons
- 24/7 subject assistance
- Covers 14 subjects
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Join millions of students enhancing their grades with Astra AI, the leading AI tutor providing personalized support in math, physics, chemistry, and beyond. Astra AI offers instant, step-by-step guidance tailored to your individual level, available anytime to adapt to your pace. Master your coursework with features like "Exam Prep" for targeted test readiness, "Solver Mode" for on-the-spot homework assistance, and "Socratic Mode" for in-depth subject exploration. This study app transforms how you learn, helping you achieve faster and smarter progress. Build a solid foundation in subjects including algebra, geometry, linear equations, chemical reactions, the periodic table, forces, and kinematics. Key Features: - Snap and Solve: Snap a photo of any assignment or question and receive immediate, clear solutions. - Step-by-Step Problem Solving: Tailored guidance adapts to your progress, identifying learning gaps and suggesting next steps. - Exam Prep: Take a photo of your exam or select topics to create a personalized study plan. - Curriculum-Based Learning: Lessons are customized to align with your country's official curriculum, ensuring you're learning what's taught in class. - Comprehensive Subject Coverage: From Math, Physics, and Chemistry to English, German, and beyond, explore 14 subjects tailored to your needs. - Available 24/7: No need for appointments or waiting times—ask anything, anytime. Why Choose Astra AI? Breakthrough understanding of previously challenging topics. Stop guessing and start learning efficiently, with confidence in class, exams, and the entire school year. With Astra AI, it's like having a dedicated tutor right in your pocket. Globally Trusted With millions of users, Astra AI empowers students and teachers worldwide to discover a more effective way to learn. Whether in classrooms, at home, or during crucial exam periods, students gain confidence and clarity, often asking and understanding questions without hesitation. Download Astra AI today and excel in your next exam. Prepare and succeed in Math, Physics, Chemistry, or any subject of your choice.
Screenshots
Verdict
The clearest difference is update cadence: Knowunity at daily against Astra AI's every 9 days. Knowunity also leads on chart position (#10 vs #195). On price, rating, review sentiment and ratings volume 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. Knowunity sells 10 in-app purchases, starting at $4.99 per 7 days and Astra AI sells 10 in-app purchases, starting at $8.00 per 7 days. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.7 for Knowunity against 4.8 for Astra AI. Both are backed by a comparable volume of ratings — 14K and 5.7K respectively. Written reviews are what separate them: 82% of Knowunity's written reviews are positive against 81% of Astra AI's.
Knowunity ships an update daily, Astra AI every 9 days. Both last shipped on November 13, 2026.
| Parameter | Knowunity | Astra AI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (14K ratings) | 4.8 (5.7K ratings) — better |
| Positive reviews | 82.4% of reviews — better | 81.2% of reviews |
| Number of ratings | 14K — better | 5.7K |
| Update frequency | Daily — better | Every 9 days |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #10 — better | #195 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 238 MB | 27 MB |
| Age rating | 4+ | 9+ |
| Developer | Knowunity GmbH | Astra AI d.o.o. |
Customer experience
Knowunity
Astra AI
Bugs and requests
Knowunity
Reported bugs
4 issues- Frequent app crashes and freezes
- Issues with uploading and saving notes
- Problems with group chat functionality
- Inconsistent behavior when navigating the app
Requested features
4 requests- Add more advanced class options
- Improve search and organization of notes
- Implement a draft feature for creating study materials
- Add more customization options
Astra AI
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Knowunity
- Knowunity Lite$4.997 Days
- Knowunity Max$14.997 Days
- Knowunity Max$23.991 Month
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- Knowunity Pro$25.993 Months
- Knowunity Lite$29.991 Year
- Knowunity Pro$29.993 Months
- Knowunity Pro$33.993 Months
- Knowunity Pro3 Months trial$49.991 Year
- Knowunity Pro$61.991 Year
- Knowunity Max$74.991 Year
Astra AI
- Astra AI Plus - Weekly$8.007 Days
- Astra AI Plus - Monthly$24.001 Month
- Astra AI Sigma - Monthly$80.001 Month
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- Astra AI Plus - Yearly$119.991 Year
- Astra AI Plus - Monthly (12 Mo Com)$119.991 Year
- Astra AI Plus - Yearly3 Days trial$119.991 Year
- Credit Pack 2x$15.00
- Credit Pack 3x$28.00
- Credit Pack 10x$99.00
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- Exam Pass$121.99







