Osmo ABCs vs Build
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Osmo ABCs
Engage young learners in a hands-on adventure to build pre-reading skills. Through interactive play with a friendly monster, children develop confidence in letter recognition, phonics, and vocabulary. This app requires physical Osmo pieces and a compatible iPhone or iPad.
- Letter recognition
- Phonics learning
- Vocabulary building
- Over 300 words
- Hands-on play
- Interactive adventure
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More than 300 words! Through this playful hands-on adventure with Mo the Monster, kids become confident about letter recognition, phonics, and vocabulary. *Play your favourite Osmo ABCs on both iPhone and iPad! Use your iPhone with the Osmo Base for iPad and Silicone Sticks & Rings pieces - each can be found at playosmo.com. *Requires the Osmo Base for iPad and Silicone Sticks & Rings pieces. Learn more by visiting www.playosmo.com. *Please see our device compatibility list here: https://support.playosmo.com/hc/articles/115010156067 ABOUT OSMO -- 21ST CENTURY PLAY AND LEARNING Osmo uses 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 intelligence technology.
Build
This app offers short, focused math drills for addition, subtraction, multiplication, and division. It provides instant feedback and tracks progress through engaging sessions designed for quick practice.
- Short, focused math practice sessions
- Master addition, subtraction, multiplication, division
- Instant feedback with haptics, color, and sound
- Smart question rotation for confidence
- Progress tracking and summaries
- Works offline, no ads, no accounts
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Turn 1–5 minutes into real math practice. Build‑A‑Math is a focused drill app for mastering addition, subtraction, multiplication, and division. Tap answers on the large on‑screen keypad, get instant feedback, and watch your progress bar fill as you work. # Why it works - Short, focused sessions (1–5 minutes) keep practice consistent and stress‑free. - Instant feedback with gentle haptics, color, and sound—celebrate correct answers and learn from mistakes. - Smart rotation of questions: a small set of problems stays in play; fast, correct solves are retired so you can move forward confidently. - Results you can feel: a cheerful summary shows Questions tried and Mastered today after each session. # Designed for real life - Pick the operations you want: +, −, ×, ÷. - Auto‑check answers as you type (single‑digit checks instantly; two‑digit checks on the second digit). - Works great in portrait or landscape on iPhone and iPad. - No ads. No accounts. Works offline. Perfect for classroom warm‑ups, brain breaks, and at‑home practice—anytime you have a minute (or five).
Screenshots
Verdict
The clearest difference is rating: Build at 4.7 against Osmo ABCs's 3.7. Build also leads on monetization model (free vs free with in-app purchases) and update cadence (fortnightly vs every 6 weeks). Osmo ABCs's advantage is ratings volume (260 vs 3) and iOS requirement (15.0 vs 17.6). 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. Neither carries in-app purchases, so what you see is what you pay.
Build holds the better App Store score, 4.7 against 3.7. That said, the two scores are not equally well evidenced: Osmo ABCs has 260 ratings behind it against 3, so its average is the more settled of the two.
Osmo ABCs ships an update every 6 weeks, Build fortnightly. The most recent releases landed on September 19, 2026 and June 1, 2026 respectively.
| Parameter | Osmo ABCs | Build |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (260 ratings) | 4.7 (3 ratings) — better |
| Positive reviews | 18.9% of reviews | — |
| Number of ratings | 260 — better | 3 |
| Update frequency | Every 6 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 842 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Tangible Play | Weiran Ye |
Customer experience
Osmo ABCs
Build
Bugs and requests
Osmo ABCs
Reported bugs
11 issues- Not compatible with iPad Pro
- Not receiving verification code
- Faulty readings (wrong tile detection)
- Camera orientation issues on newer iPads
- App won't open for some users
Show 6 moreShow fewer
- Reflector not recognizing letters/pieces
- No sound
- Audio keeps dropping
- App crashes on opening
- ABC app not opening
- Connectivity issues with ABC game redirection
Requested features
3 requests- Update app for newer iPads
- Fix ABC game redirection to App Store
- Fix audio issues
Build
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Osmo ABCs
No in-app purchases
Build
No in-app purchases
Questions
Is Osmo ABCs free?
Is Build free?
Which has better reviews, Osmo ABCs or Build?
Do Osmo ABCs or Build have ads?
Which is updated more often, Osmo ABCs or Build?
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