# Shape Theory vs Cipher Challenge

The clearest difference is in-app purchases: Cipher Challenge at none against Shape Theory's 3. Cipher Challenge also leads on ads (none vs shown). Shape Theory's advantage is review sentiment (100% vs 67%) and update cadence (every 3 weeks vs every 5 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Shape Theory sells 3 in-app purchases, starting at $0.99 per month. Cipher Challenge asks for nothing beyond the download.

Shape Theory ships an update every 3 weeks, Cipher Challenge every 5 weeks. The most recent releases landed on September 27, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Shape Theory | Cipher Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/cipher-challenge-codebusters/id6742675455/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 13 MB | 1 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Bulltech](https://appshunter.io/developer/1586482702) | [Bao Lei](https://appshunter.io/developer/376966834) |

## What reviewers say

### Shape Theory

[App page](https://appshunter.io/ios/app/shape-theory-brain-puzzles/id6449924079)

Uncover hidden geometric shapes by strategically revealing parts of a concealed form. Deduce the correct shape from a list of suspects to advance through increasingly challenging levels. Compete globally for the top leaderboard spot.

**Highlights:** Shape discovery through limited reveals, Strategic deduction of hidden forms, Progressive difficulty levels, Minimalist, captivating graphics, Global leaderboard competition, Brain teaser and strategy gameplay

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads For 1 Month | $0.99 | per month |
| No Ads For 1 Year | $4.99 | per year |
| No Ads Forever | $8.99 | one-time |


### Cipher Challenge

[App page](https://appshunter.io/ios/app/cipher-challenge-codebusters/id6742675455)

Engage your mind with a variety of cipher decoding challenges. Practice different cipher types, track your progress, and compete with friends. Unlock quotes and sync your achievements across devices.

**Highlights:** Multiple cipher modes, Letter frequency analysis, Multiplayer competition, Unlocked quote gallery, Score history tracking, iCloud sync across devices, Hard mode challenge

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Shape Theory free?

Shape Theory is free to download, with in-app purchases available.

### Is Cipher Challenge free?

Cipher Challenge is free to download, with no in-app purchases.

### Do Shape Theory or Cipher Challenge have ads?

Shape Theory shows ads; Cipher Challenge does not.

### Which is updated more often, Shape Theory or Cipher Challenge?

Shape Theory ships an update every 3 weeks, and Cipher Challenge every 5 weeks. Most recently, Shape Theory was updated on September 27, 2026 and Cipher Challenge on September 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*