CellWalk vs Knowable
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CellWalk
Explore the intricate world of cells in a 3D environment, from the overall structure down to molecular details. Tap on terms to receive clear, contextual explanations powered by on-device AI, adapting to your learning level. Designed for students and educators to foster a deeper understanding of cell biology.
- 3D cell exploration
- On-device AI definitions
- Multi-level explanations
- Interactive concept chains
- Touch-first navigation
- High-fidelity visuals
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CellWalk puts a living cell in your hands and on your desk. Zoom from a whole cell down to the atoms in DNA. Explore a cell modeled protein by protein from real structures discovered by scientists. Start your journey with Ako, an AI tutor that helps you understand what you see. Built for students, teachers and anyone curious about how life works at the molecular scale. 2025 Apple Design Award finalist. EXPLORE A REAL CELL Zoom from a whole Mycoplasma cell down to single atoms. Thousands of proteins, DNA and RNA, ribosomes and membranes, rendered from published scientific data. Tap any molecule to learn what it is and what it does. Tap any term for an explanation at your level, written on your device with Apple Intelligence. Place molecular scenes in your space with augmented reality on compatible iPhone and iPad devices. LEARN WITH AKO Ako helps you build understanding through questions. It brings molecular structures into view, invites you to look closer and explain what you notice, then builds on your answers to help you make connections. Socratic learning, one discovery at a time. Type or dictate. Ask anything about what’s on screen or in your space. Your Ako lessons, your progress in them and what Ako has learned about you stay with you: on your device and, if you use iCloud, in your own iCloud. Get more of Ako with CellWalk Pro. GUIDED TOURS Start your journey with The Molecular Design of Life, a complete tour of the Mycoplasma cell made with Dr. David Goodsell. Each tour includes a guided narration, free explore mode and Ako practice lessons to test your understanding. CellWalk Pro adds more guided tours and lessons with an expanded library of cells and organisms. Explore the incredible molecular machines that power neurons and thought, or dive into the architecture of a virus like HIV. LEARN BY DOING Step into the Central Dogma of Biology with a hands-on interactive lesson on the all new Learning Path. Learn how the instructions in DNA are read and translated into the proteins that build and sustain your cells. WHAT’S FREE Explore The Molecular Design of Life tour and its accompanying Ako lesson and explore modes, and try the “What is a Protein?” interactive lesson on the Learning Path. You can also ask Ako in-depth questions with a free daily allowance. CELLWALK PRO Unlock all other guided tours and their accompanying Ako lessons, a larger daily question allowance and longer answers from Ako. Choose a monthly or annual auto-renewing subscription. One subscription covers iPhone, iPad and Mac. ASK FROM ANYWHERE Say “Ask CellWalk a biology question” and Siri answers from CellWalk’s own content without opening the app. “Continue my lesson in CellWalk” picks up where you left off. On iPhone and iPad, use Visual Intelligence on a textbook diagram, choose Search CellWalk with an Image, and tap a match to open that tour, lesson or molecule. HOW THE AI WORKS Ako is built with the Foundation Models framework. Where Apple Intelligence is available, it answers on Private Cloud Compute, and the on-device model explains the terms you tap. OpenAI, a third-party AI service, plans lessons and answers when Apple Intelligence isn’t available on your device or in your region. The app asks your permission before sending your first question. You can change that permission under Account → Privacy. CellWalk doesn’t require a separate CellWalk account, and AI requests aren’t tied to your name. Find details under Account → Privacy → About CellWalk & AI. Apple Intelligence features require iPhone 15 Pro or later, an iPad with M1 or A17 Pro or later, or a Mac with Apple silicon. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Service: https://cellwalk.ca/terms-of-service Privacy Policy: https://cellwalk.ca/privacy
Knowable
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Picture this. It's 8:47 on a Tuesday. Your worksheet is on the kitchen table. You've been staring at problem 4 for ten minutes, and you don't quite remember how to integrate. Worse, every "homework helper" you've tried just hands over the answer, and you learn nothing except how to copy. Knowable is different. Meet Milo, the next generation of AI tutoring. Open the app, point the camera at the problem, and Milo starts paying attention. As you work through a problem, in an instant you can get a hint tailored to wherever you are in your process. "What do you already know about the angles in a triangle?" "You wrote 3x there. What does the x stand for?" "Try reading the second sentence again. What's it actually asking you to find?" Just the kind of small nudge a great teacher gives; the one that makes you go "oh, I see it now" and write the next line yourself. WHAT MILO HELPS WITH Working out a problem on paper, on your own, can be daunting and frustrating. That's where we hope to help. A nudge here, a hint there, visually grounded in the work you've done so far goes a long way in improving understanding and instilling confidence in your own problem solving skills. FOR PARENTS AND TEACHERS Trusting AI with the task of teaching your loved ones is a huge ask. We don't want to replace teachers or game metrics. We have one goal: to unblock you in your problem solving process when you're stuck. We don't ever save the desk view images on our servers. They're processed and deleted after the session is over. Voice recognition runs entirely on-device. Teachers can follow along with their classes through a shared link. Parents decide what gets shared and what stays at home. BUILT FOR REAL TESTS Use "Test Prep" mode to drill dynamically generated problems on a loop, iteratively tuned to your exact level of understanding in the topic. All you need to do is upload your course materials and a short blurb about what to focus on, and what your goals are. For free you get 1000 credits/month. If you want more, you can subscribe and get 10,000 credits/month. If that's still not enough, you can purchase additional credits in the app. Open Knowable. Let yourself have the 24/7 patient tutor everyone deserves. Privacy Statement at https://knowable.ca/privacy Terms of Use at https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Knowable at every 3 days against CellWalk's every 3 weeks. Knowable also leads on iOS requirement (17.0 vs 27.0). On price, ads, in-app purchases and device support 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. CellWalk sells 3 in-app purchases, starting at $9.99 per month and Knowable sells 4 in-app purchases, starting at $24.99 per month. Whichever you choose, the download price is not the number that matters.
CellWalk ships an update every 3 weeks, Knowable every 3 days. The most recent releases landed on October 17, 2026 and October 15, 2026 respectively.
| Parameter | CellWalk | Knowable |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (71 ratings) — better | — |
| Positive reviews | 91.7% of reviews | — |
| Number of ratings | 71 — better | — |
| Update frequency | Every 3 weeks | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac, Vision Pro — better | iPhone, iPad, Mac |
| Requires iOS | 27.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 552 MB | 67 MB |
| Age rating | 12+ | 4+ |
| Developer | Ako Biotica Inc. | Samuel Xu |
Bugs and requests
CellWalk
Reported bugs
4 issues- ATP synthase described backwards
- Renderer noise causes nausea
- Buggy and low framerate
- Renderer not responsive to head movements
Requested features
10 requests- More cells to explore (eukaryotic, mammalian, computer cells)
- More content and depth
- Expand on descriptions with an 'expand on' feature
- Add tutorials for new users
- Add color to highlighted text for easy reference
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- Depict a minimal eukaryotic cell
- Depict a cell undergoing mitosis
- Make cell models free-floating instead of behind windows
- Option to purchase additional content
- Update renderer for responsiveness to head movements
Knowable
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CellWalk
- CellWalk Pro Monthly$9.991 Month
- CellWalk Pro Annual$79.991 Year
- Pro Lessons$29.99
Knowable
- Monthly7 Days trial$24.991 Month
- 1 Year Upfront7 Days trial$249.991 Year
- 500 Credits$4.99
- 10,000 Credits$24.99









