Comparison

Osmo ABCs vs Build

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

Head to head
About

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.

Highlights
  • Letter recognition
  • Phonics learning
  • Vocabulary building
  • Over 300 words
  • Hands-on play
  • Interactive adventure
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

Osmo ABCs4 screens
Build2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Osmo ABCs ships an update every 6 weeks, Build fortnightly. The most recent releases landed on September 19, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
Osmo ABCs versus Build: the parameters behind the verdict, then further details
ParameterOsmo ABCsBuild
PriceFreeFree
Rating3.7 (260 ratings)4.7 (3 ratings) — better
Positive reviews18.9% of reviews
Number of ratings260 — better3
Update frequencyEvery 6 weeksFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.6
Further details — not scored
Size842 MB1 MB
Age rating4+4+
DeveloperTangible PlayWeiran Ye

Customer experience

Osmo ABCs

All ratings260 ratings
Positive63.1%
Neutral9.2%
Negative27.7%
Written reviews37 reviews
Positive18.9%
Neutral2.7%
Negative78.4%

Build

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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 more
  • 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

None

Osmo ABCs

No in-app purchases

None

Build

No in-app purchases

Questions

Is Osmo ABCs free?
Osmo ABCs is free to download, with no in-app purchases.
Is Build free?
Build is free to download, with no in-app purchases.
Which has better reviews, Osmo ABCs or Build?
Build is rated higher. Osmo ABCs averages 3.7 out of 5 from 260 ratings, while Build averages 4.7 from 3 ratings.
Do Osmo ABCs or Build have ads?
Neither Osmo ABCs nor Build shows ads.
Which is updated more often, Osmo ABCs or Build?
Osmo ABCs ships an update every 6 weeks, and Build fortnightly. Most recently, Osmo ABCs was updated on September 19, 2026 and Build on June 1, 2026.

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