Isotropy vs Number Challenge
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Isotropy
A fast-paced puzzle game where players must quickly identify and tap the unique item among 100 identical ones within a strict time limit. Challenge yourself to find as many differences as possible in this addictive test of observation.
- Identify unique item
- 10-second time limit
- Fast-paced gameplay
- Observation challenge
- High replayability
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100 pieces, one of them unlike the others, and only 10 seconds to find it. Repeat as much as you can! Just tap the unsuitable piece.
Number Challenge
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Number Challenge: Brain Game is a fast, addictive focus test inspired by viral “think of a number” challenges. Pick a number in your head, keep your eyes locked on the center, and stay calm while numbers appear and distractions try to break your concentration. The better your focus, the higher your score. How to Play Choose a number (0–9) silently. Focus on the center area while numbers cycle. Tap to confirm when you’re ready. Beat the timer and keep your streak alive. Features Quick rounds for instant play Focus & perception challenge (simple rules, surprisingly hard) Streaks + best score tracking Clean minimal design (easy to understand, hard to master) Play anywhere — no complicated setup Train your attention, test your perception, and challenge friends to see who stays focused the longest.
Screenshots
Verdict
The clearest difference is in-app purchases: Number Challenge at none against Isotropy's 1. Isotropy's advantage is ads (none vs shown) and iOS requirement (6.0 vs 13.0). On price 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. Isotropy sells 1 one-off in-app purchase. Number Challenge asks for nothing beyond the download.
| Parameter | Isotropy | Number Challenge |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 6.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 72 MB | 73 MB |
| Age rating | 4+ | 4+ |
| Developer | Dmitriy Prikhodko | OPTOELECTRONICS FUTURE LTD |
In-app purchases
Isotropy
- Remove Ads$1.99
Number Challenge
No in-app purchases
Questions
Is Isotropy free?
Is Number Challenge free?
Do Isotropy or Number Challenge have ads?
Other comparisons
