# Peg Pals vs Shape Theory

The clearest difference is price: Shape Theory at Free against Peg Pals's $0.99. Shape Theory also leads on update cadence (every 3 weeks vs every 5 months) and review sentiment (100% vs 88%). Peg Pals's advantage is in-app purchases (none vs 3) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Shape Theory is free to download; Peg Pals costs $0.99 up front. Shape Theory sells 3 in-app purchases, starting at $0.99 per month. Peg Pals asks for nothing beyond the download.

Peg Pals ships an update every 5 months, Shape Theory every 3 weeks. Both last shipped on October 12, 2026.

## The numbers

| Metric | Peg Pals | Shape Theory |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.6 (25 ratings)](https://appshunter.io/ios/app/peg-pals-triangle-solitaire/id468305550/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 87.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 29 MB | 13 MB |
| Requires iOS | **17** | 18.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [David P. Sumner](https://appshunter.io/developer/320952197) | [Bulltech](https://appshunter.io/developer/1586482702) |

## What reviewers say

### Peg Pals

[App page](https://appshunter.io/ios/app/peg-pals-triangle-solitaire/id468305550)

This game offers thousands of triangular peg solitaire puzzles with unique twists and unlimited hints. Learn to solve any puzzle, create your own, and enjoy a relaxing or challenging experience. The game state is always saved, allowing for seamless interruptions.

**Highlights:** Thousands of unique puzzles, Unlimited hints and undo, Custom puzzle creation, Solvable indicator, Optional timer, Auto-save game state

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Peg Pals free?

Peg Pals costs $0.99, with no in-app purchases.

### Is Shape Theory free?

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

### Do Peg Pals or Shape Theory have ads?

Shape Theory shows ads; Peg Pals does not.

### Which is updated more often, Peg Pals or Shape Theory?

Peg Pals ships an update every 5 months, and Shape Theory every 3 weeks. Most recently, Peg Pals was updated on October 12, 2026 and Shape Theory on October 12, 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.*