# GetPrincipia vs Physics Playground App

The clearest difference is in-app purchases: Physics Playground App at none against GetPrincipia's 2. Physics Playground App also leads on update cadence (weekly vs every 2 months). GetPrincipia's advantage is iOS requirement (15.1 vs 18). On price, ads and device support there is nothing between them.

Both are free to download. GetPrincipia sells 2 in-app purchases, starting at $6.99 per month. Physics Playground App asks for nothing beyond the download.

GetPrincipia ships an update every 2 months, Physics Playground App weekly. The most recent releases landed on October 2, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | GetPrincipia | Physics Playground App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/physics-playground-app/id6773154302/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | — | Free |
| Size | 38 MB | 29 MB |
| Requires iOS | **15.1** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Axiom 38 LLC](https://appshunter.io/developer/1887968723) | [AJA Digital LLC](https://appshunter.io/developer/1329243304) |

## What reviewers say

### GetPrincipia

[App page](https://appshunter.io/ios/app/getprincipia/id6761139348)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $6.99 | per month |
| Annual | $44.99 | per year |


### Physics Playground App

[App page](https://appshunter.io/ios/app/physics-playground-app/id6773154302)

Explore the universe of physics and math through interactive simulations and real-time equation adjustments. Learn concepts from basic counting to advanced theories with hands-on playgrounds and mini-games that earn you badges. Designed for all levels of understanding, from children to PhDs.

**Highlights:** Interactive physics and math playgrounds, Real-time equation adjustments, Adjustable difficulty slider (Child to PhD), Mini-games with badge rewards, Concept map for interconnected ideas, Offline-first functionality, No ads or accounts required

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

**In-app purchases:** none


## Frequently asked questions

### Is GetPrincipia free?

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

### Is Physics Playground App free?

Physics Playground App is free to download, with no in-app purchases.

### Do GetPrincipia or Physics Playground App have ads?

Neither GetPrincipia nor Physics Playground App shows ads.

### Which is updated more often, GetPrincipia or Physics Playground App?

GetPrincipia ships an update every 2 months, and Physics Playground App weekly. Most recently, GetPrincipia was updated on October 2, 2026 and Physics Playground App on October 14, 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.*