# P21 vs Sentopoly

The clearest difference is in-app purchases: P21 at none against Sentopoly's 2. P21 also leads on iOS requirement (11.0 vs 16.4). Sentopoly's advantage is update cadence (every 3 days vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Sentopoly sells 2 in-app purchases, starting at $4.99 per month. P21 asks for nothing beyond the download.

P21 ships an update every 6 weeks, Sentopoly every 3 days. The most recent releases landed on November 2, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | P21 | Sentopoly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/p21/id1453823561/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Monetization | Free | — |
| Size | 226 MB | 104 MB |
| Requires iOS | **11.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CAVES BOOKS LTD.](https://appshunter.io/developer/547924599) | [Ian Jukes](https://appshunter.io/developer/6802957338) |

## What reviewers say

### P21

[App page](https://appshunter.io/ios/app/p21/id1453823561)

This educational app supports a four-level phonics series for young learners. It offers audio tracks, videos, flashcards, and games to help children build foundational skills in phonological awareness, reading, and spelling.

**Highlights:** Audio tracks from student books, Educational videos, Keyword flashcards, Phonics games, Progress tracking

**Features:** macOS Compatibility

**In-app purchases:** none


### Sentopoly

[App page](https://appshunter.io/ios/app/sentopoly/id6818927873)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sentopoly Pro, monthly | $4.99 | per month |
| Sentopoly Pro, yearly | $29.99 | per year |


## Frequently asked questions

### Is P21 free?

P21 is free to download, with no in-app purchases.

### Is Sentopoly free?

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

### Do P21 or Sentopoly have ads?

Neither P21 nor Sentopoly shows ads.

### Which is updated more often, P21 or Sentopoly?

P21 ships an update every 6 weeks, and Sentopoly every 3 days. Most recently, P21 was updated on November 2, 2026 and Sentopoly on November 6, 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.*