# OrthoFlow vs Aliner

The clearest difference is in-app purchases: OrthoFlow at none against Aliner's 3. OrthoFlow also leads on iOS requirement (15.1 vs 18.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Aliner sells 3 in-app purchases, starting at $2.99 per month. OrthoFlow asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | OrthoFlow | Aliner |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Size | 75 MB | 16 MB |
| Requires iOS | **15.1** | 18.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Devinbi](https://appshunter.io/developer/1840846742) | [Bogdan Nikishin](https://appshunter.io/developer/1735946582) |

## 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


### Aliner

[App page](https://appshunter.io/ios/app/aliner-aligner-tracker/id6779657332)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Aliner+ Monthly | $2.99 | per month |
| Aliner+ Yearly | $19.99 | per year |
| Aliner+ Lifetime | $34.99 | one-time |


## Frequently asked questions

### Is OrthoFlow free?

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

### Is Aliner free?

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

### Do OrthoFlow or Aliner have ads?

Neither OrthoFlow nor Aliner shows ads.

### Which is updated more often, OrthoFlow or Aliner?

OrthoFlow ships an update every 3 months, and Aliner every 3 months. Most recently, OrthoFlow was updated on October 15, 2026 and Aliner on October 6, 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.*