Osmo World vs Primedor
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Osmo World
This app serves as a central hub for a collection of educational games designed to foster creativity, problem-solving, and social interaction in children. It allows users to launch into various Osmo games and collect virtual rewards.
- Launch Osmo games
- Explore game library
- Win collectible stickers
- Hands-on learning
- Promotes creativity
- Encourages problem-solving
- Fosters social interaction
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This is the home for Osmo! Launch into Osmo to explore all your favorite Osmo games, and win collectible stickers along the way. Osmo is connecting over 1 million kids around the world to a new healthy, hands-on learning experience that promotes creativity, problem-solving, and social interaction. Find out more at www.playosmo.com
Primedor
A strategic card game where players build a mathematical empire by collecting tokens, purchasing cards with permanent bonuses, and claiming legendary mathematicians. Challenge intelligent AI opponents in games of flexible speed and track your progress.
- Strategic token economy
- Intelligent AI opponents
- 90 unique math cards
- 10 mathematicians to claim
- Flexible gameplay speed
- Progress tracking
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PRIMEDOR is a strategic card game where you build a mathematical empire through careful planning and clever token management. Challenge yourself against three intelligent AI opponents—Bob, Abby, Emma, and Ann—as you purchase cards, collect tokens, and claim famous mathematicians. Core Gameplay: Collect mathematical tokens (Prime, Even, Odd, Square, Sequence, Perfect) to purchase valuable cards. Each card provides permanent bonuses and victory points. Build powerful card synergies to claim the patronage of legendary mathematicians like Euclid, Pythagoras, and Emmy Noether. Features: Strategic Token Economy: Manage a limited supply of tokens to outmaneuver opponents Intelligent AI: Face opponents that adapt their strategy and make calculated decisions 90 Unique Cards: Collect cards featuring famous mathematical concepts and sequences 10 Mathematicians to Claim: Earn bonuses from history's greatest mathematical minds Flexible Gameplay: Play 2-4 player games at your preferred speed (Slow, Normal, Fast) Track Your Progress: Monitor your stats across different player counts Beautiful Interface: Smooth animations and immersive sound design Perfect for strategy game lovers, math enthusiasts, and anyone who enjoys deep, engaging gameplay.
Screenshots
Verdict
The clearest difference is review sentiment: Primedor at 100% against Osmo World's 42%. Primedor also leads on rating (5.0 vs 3.9) and update cadence (every 3 days vs every 2 months). Osmo World's advantage is ratings volume (1.3K vs 1) and device support (3 vs 1). On price, ads and in-app purchases 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.
Primedor holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Osmo World has 1.3K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 42% of Osmo World's written reviews are positive against 100% of Primedor's.
Osmo World ships an update every 2 months, Primedor every 3 days. The most recent releases landed on September 27, 2026 and July 1, 2026 respectively.
| Parameter | Osmo World | Primedor |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (1.3K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 42.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 1.3K — better | 1 |
| Update frequency | Every 2 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 347 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Tangible Play | Harold Sultan |
Customer experience
Osmo World
Primedor
Bugs and requests
Osmo World
Reported bugs
4 issues- App crashes or freezes
- Camera recognition problems
- Saved progress/data loss
- Incompatibility with certain iPad models
Requested features
4 requests- More game content and updates
- Improved account/progress syncing
- Simplified setup and onboarding
- Better support for newer hardware
Primedor
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Osmo World
No in-app purchases
Primedor
No in-app purchases









