# Smile Scan vs Aligner Diary

The clearest difference is update cadence: Aligner Diary at weekly against Smile Scan's every 2 months. Aligner Diary also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Smile Scan sells 3 in-app purchases, starting at $4.99 per 7 days and Aligner Diary sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Smile Scan ships an update every 2 months, Aligner Diary weekly. Both last shipped on October 31, 2026.

## The numbers

| Metric | Smile Scan | Aligner Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 87 MB | 47 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Fatih Erdogan](https://appshunter.io/developer/1526494037) | [思佳 李](https://appshunter.io/developer/1835312196) |

## What reviewers say

### Smile Scan

[App page](https://appshunter.io/ios/app/smile-scan-braces-and-aligner/id6785473745)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Monthly | $8.99 | per month |
| Annual | $17.99 | per year |


### 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 Smile Scan free?

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

### Is Aligner Diary free?

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

### Do Smile Scan or Aligner Diary have ads?

Neither Smile Scan nor Aligner Diary shows ads.

### Which is updated more often, Smile Scan or Aligner Diary?

Smile Scan ships an update every 2 months, and Aligner Diary weekly. Most recently, Smile Scan was updated on October 31, 2026 and Aligner Diary on October 31, 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.*