# STUDIO 20 CpH vs Aligner Diary

The clearest difference is in-app purchases: STUDIO 20 CpH at none against Aligner Diary's 3. STUDIO 20 CpH also leads on iOS requirement (13.0 vs 15.0). Aligner Diary's advantage is update cadence (weekly vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Aligner Diary sells 3 in-app purchases, starting at $0.99 per month. STUDIO 20 CpH asks for nothing beyond the download.

STUDIO 20 CpH ships an update every 3 weeks, Aligner Diary weekly. The most recent releases landed on October 3, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | STUDIO 20 CpH | Aligner Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 38 MB | 47 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YOGO.DK ApS](https://appshunter.io/developer/1473308022) | [思佳 李](https://appshunter.io/developer/1835312196) |

## What reviewers say

### STUDIO 20 CpH

[App page](https://appshunter.io/ios/app/studio-20-cph/id6470204510)

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

**In-app purchases:** none


### Aligner Diary

[App page](https://appshunter.io/ios/app/aligner-diary/id6802318433)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Annual | $3.99 | per year |
| Pro Lifetime | $7.99 | one-time |


## Frequently asked questions

### Is STUDIO 20 CpH free?

STUDIO 20 CpH is free to download, with no in-app purchases.

### Is Aligner Diary free?

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

### Do STUDIO 20 CpH or Aligner Diary have ads?

Neither STUDIO 20 CpH nor Aligner Diary shows ads.

### Which is updated more often, STUDIO 20 CpH or Aligner Diary?

STUDIO 20 CpH ships an update every 3 weeks, and Aligner Diary weekly. Most recently, STUDIO 20 CpH was updated on October 3, 2026 and Aligner Diary on October 5, 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.*