# OrthoFlow vs Aligner Diary

The clearest difference is in-app purchases: OrthoFlow at none against Aligner Diary's 3. Aligner Diary's advantage is update cadence (weekly vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

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

OrthoFlow ships an update every 3 months, Aligner Diary weekly. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | OrthoFlow | Aligner Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Size | 75 MB | 47 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Devinbi](https://appshunter.io/developer/1840846742) | [思佳 李](https://appshunter.io/developer/1835312196) |

## What reviewers say

### OrthoFlow

[App page](https://appshunter.io/ios/app/orthoflow-aligner-tracker/id6758885625)

**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 OrthoFlow free?

OrthoFlow 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 OrthoFlow or Aligner Diary have ads?

Neither OrthoFlow nor Aligner Diary shows ads.

### Which is updated more often, OrthoFlow or Aligner Diary?

OrthoFlow ships an update every 3 months, and Aligner Diary weekly. Most recently, OrthoFlow was updated on October 15, 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.*