Comparison

Osmo Numbers Classic vs Katachi

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Add, count, and multiply tiles
  • Pop number bubbles
  • Collect over 90 unique fish
  • Learn math creatively
  • Develop problem-solving skills
  • Hands-on play experience
Read full description

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.

About

Katachi

Features
Read full description

〔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

Osmo Numbers Classic4 screens
Katachi4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Katachi sells 1 one-off in-app purchase. Osmo Numbers Classic asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Osmo Numbers Classic versus Katachi: the parameters behind the verdict, then further details
ParameterOsmo Numbers ClassicKatachi
PriceFreeFree
Rating4.0 (264 ratings) — better—
Positive reviews55.0% of reviews—
Number of ratings264 — better—
Update frequencyEvery 2 monthsMonthly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better17.0
Further details — not scored
Size185 MB6 MB
Age rating4+4+
DeveloperTangible Playatsuko 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
Show 5 more
  • 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
Show 5 more
  • 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

None

Osmo Numbers Classic

No in-app purchases

1 purchases

Katachi

One-time1
  • Remove Ads$2.99

Questions

Is Osmo Numbers Classic free?
Osmo Numbers Classic is free to download, with no in-app purchases.
Is Katachi free?
Katachi is free to download, with in-app purchases available.
Do Osmo Numbers Classic or Katachi have ads?
Katachi shows ads; Osmo Numbers Classic does not.
Which is updated more often, Osmo Numbers Classic or Katachi?
Osmo Numbers Classic ships an update every 2 months, and Katachi monthly. Most recently, Osmo Numbers Classic was updated on August 12, 2026 and Katachi on September 8, 2026.

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