# STDY vs Perfection in Physics

The clearest difference is update cadence: STDY at every 3 days against Perfection in Physics's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

STDY ships an update every 3 days, Perfection in Physics monthly. The most recent releases landed on September 17, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | STDY | Perfection in Physics |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Monthly |
| Size | 78 MB | 60 MB |
| Requires iOS | 15.0 | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ahmed Kassem](https://appshunter.io/developer/1212291808) | [Omar Ibrahim](https://appshunter.io/developer/1575706178) |

## What reviewers say

### STDY

[App page](https://appshunter.io/ios/app/stdy/id6475807664)

**In-app purchases:** none


### Perfection in Physics

[App page](https://appshunter.io/ios/app/perfection-in-physics/id6748640785)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is STDY free?

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

### Is Perfection in Physics free?

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

### Do STDY or Perfection in Physics have ads?

Neither STDY nor Perfection in Physics shows ads.

### Which is updated more often, STDY or Perfection in Physics?

STDY ships an update every 3 days, and Perfection in Physics monthly. Most recently, STDY was updated on September 17, 2026 and Perfection in Physics on September 7, 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.*