# Sapling Isle vs Physics Handbook

The clearest difference is in-app purchases: Sapling Isle at none against Physics Handbook's 3. Physics Handbook's advantage is update cadence (every 5 days vs fortnightly) and iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Physics Handbook sells 3 in-app purchases, starting at $1.99 per month. Sapling Isle asks for nothing beyond the download.

Sapling Isle ships an update fortnightly, Physics Handbook every 5 days. The most recent releases landed on November 10, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Sapling Isle | Physics Handbook |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | Free | — |
| Size | 40 MB | 66 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [大鹏 张](https://appshunter.io/developer/937718061) | [Oleg Korunov](https://appshunter.io/developer/6811071409) |

## What reviewers say

### Sapling Isle

[App page](https://appshunter.io/ios/app/sapling-isle-physics-lab/id6792211746)

Explore physics and astronomy through interactive 3D experiments. Manipulate variables, observe system responses, and delve into underlying scientific concepts and equations. Offers multilingual support and adaptive layouts for iPhone and iPad.

**Highlights:** Interactive 3D physics experiments, 3D Solar System simulation, Black hole and light bending exploration, Microscopic world simulations, Multivariable comparisons and graphs, Exploration of equations and model limits, Multilingual interface

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

**In-app purchases:** none


### Physics Handbook

[App page](https://appshunter.io/ios/app/physics-handbook-formulas/id6811815476)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Physics Pro — Monthly | $1.99 | per month |
| Physics Pro — Yearly | $9.99 | per year |
| Physics Pro — Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Sapling Isle free?

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

### Is Physics Handbook free?

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

### Do Sapling Isle or Physics Handbook have ads?

Neither Sapling Isle nor Physics Handbook shows ads.

### Which is updated more often, Sapling Isle or Physics Handbook?

Sapling Isle ships an update fortnightly, and Physics Handbook every 5 days. Most recently, Sapling Isle was updated on November 10, 2026 and Physics Handbook on November 13, 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.*