# Soy ETST vs Physica

The clearest difference is in-app purchases: Soy ETST at none against Physica's 6. Soy ETST also leads on iOS requirement (13.0 vs 17.6). Physica's advantage is update cadence (every 2 months vs every 6 months) and device support. On price there is nothing between them.

Both are free to download. Physica sells 6 in-app purchases, starting at $6.99 per month. Soy ETST asks for nothing beyond the download.

Soy ETST ships an update every 6 months, Physica every 2 months. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Soy ETST | Physica |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | Every 6 months | **Every 2 months** |
| Size | 66 MB | 111 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Instituto de Ciencias y Estudios Superiores de Tamaulipas, A.C.](https://appshunter.io/developer/1619803124) | [Lojas Software Corp](https://appshunter.io/developer/1799458054) |

## What reviewers say

### Soy ETST

[App page](https://appshunter.io/ios/app/soy-etst/id6443921817)

**In-app purchases:** none


### Physica

[App page](https://appshunter.io/ios/app/physica-discover-physics/id6767663716)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Physica Pro (Monthly) | $6.99 | per month |
| 25 Hints - Photon Pack | $0.99 | one-time |
| 5 Skips - Tachyon Pack | $0.99 | one-time |
| 60 Hints - Kinetic Bundle | $1.99 | one-time |
| 15 Skips - Wormhole Bundle | $1.99 | one-time |
| 150 Hints · Photon Pack | $3.99 | one-time |


## Frequently asked questions

### Is Soy ETST free?

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

### Is Physica free?

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

### Which is updated more often, Soy ETST or Physica?

Soy ETST ships an update every 6 months, and Physica every 2 months. Most recently, Soy ETST was updated on October 30, 2026 and Physica on November 9, 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.*