Osmo Numbers Classic vs Katachi
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Osmo Numbers Classic
Engage children in hands-on math play by adding, counting, and multiplying tiles to pop number bubbles. This interactive game fosters a creative and explorative mindset towards mathematics, making learning fun and engaging in a vibrant underwater world.
- Add, count, and multiply tiles
- Pop number bubbles
- Collect over 90 unique fish
- Learn math creatively
- Develop problem-solving skills
- Hands-on play experience
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Add, count & multiply tiles to pop the number bubbles. Popping enough will free fish & unleash a lightning storm! Learn to be the numbers master. **One of 2016’s most intuitive product designs.** - Fast Company Award "...once again, Osmo has built something wonderfully creative and interactive." - Venture Beat "Osmo Numbers takes the fear out of figures." - Forbes "…revamp the unimaginative worksheets educators use to teach math" - TechCrunch When kids understand there are many ways to solve a problem, math becomes creative & fun. By having no wrong answers, we replace fear of math with an explorative mindset. Your kids will play in this beautiful engaging underwater world for ages, collecting over 90 fish of all kinds, from Rainbow to Frankenfish! *Requires the Osmo Base and Numbers tiles, found at www.playosmo.com * Please see our device compatibility list here: https://support.playosmo.com/hc/articles/115010156067 About Osmo Osmo is using the screen to create a new healthy, hands-on learning experience that promotes creativity, problem-solving and social interaction. We do this with our reflective artificial intelligent technology.
Katachi
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〔What is Katachi?〕 Shapes stream across the screen — circles, triangles, squares, stars — in four directions and five colors. One rule: tap only the ones that match the prompt. Sounds simple. Gets real fast. 〔Four Ways to Play〕 · 10-Question Challenge — Four difficulty levels (Easy to Expert) plus negation prompts ("tap everything except…") keep every session fresh · Daily Challenge — 10 questions shared worldwide each day. Track your streak and share results Wordle-style · Endless Mode — Survive as long as you can. No mercy. · 200 Levels — A long-form progression that grows with you 〔Brain Age〕 Your reaction speed is measured and converted into a brain-response age (15–80). Play daily to push it younger. 〔Built with care〕 · 80 prompt patterns (4 shapes × 5 colors × 4 directions) · Detailed stats with Swift Charts · Dark mode and color-accessibility support · No internet required (except ads) · Zero personal data collected 〔Privacy〕 All gameplay data stays on your device. No account needed. Privacy Policy: https://kazusa703.github.io/privacy.html Terms of Use: https://kazusa703.github.io/terms.html Support: https://kazusa703.github.io/support.html
Screenshots
Verdict
The clearest difference is in-app purchases: Osmo Numbers Classic at none against Katachi's 1. Osmo Numbers Classic also leads on ads (none vs shown) and device support (3 vs 1). Katachi's advantage is update cadence (monthly vs every 2 months). On price 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. Katachi sells 1 one-off in-app purchase. Osmo Numbers Classic asks for nothing beyond the download.
Osmo Numbers Classic ships an update every 2 months, Katachi monthly. The most recent releases landed on August 12, 2026 and September 8, 2026 respectively.
| Parameter | Osmo Numbers Classic | Katachi |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (264 ratings) — better | — |
| Positive reviews | 55.0% of reviews | — |
| Number of ratings | 264 — better | — |
| Update frequency | Every 2 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 185 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Tangible Play | atsuko imai |
Bugs and requests
Osmo Numbers Classic
Reported bugs
10 issues- Apps not loading
- Never-ending loading screen
- App crashes
- Cannot access camera
- Doesn't recognize tiles properly
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- Profile and progress not saving
- Multiplication level displays addition
- Combos not detected often
- Game freezes
- App unusable due to camera access issues
Requested features
10 requests- Add more levels
- Include verbal number prompts
- Simpler starting point for younger kids
- More varied gameplay types
- Add an exit button for games
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- More challenging levels
- Allow profile and progress saving
- Fix multiplication portion issues
- Add visual cues for words
- Revert to older design
Katachi
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Osmo Numbers Classic
No in-app purchases
Katachi
- Remove Ads$2.99
Questions
Is Osmo Numbers Classic free?
Is Katachi free?
Do Osmo Numbers Classic or Katachi have ads?
Which is updated more often, Osmo Numbers Classic or Katachi?
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