# SmileDiary vs Aligner Wear Timer

The clearest difference is update cadence: SmileDiary at every 5 days against Aligner Wear Timer's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SmileDiary sells 3 in-app purchases, starting at $2.99 per month and Aligner Wear Timer sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

SmileDiary ships an update every 5 days, Aligner Wear Timer monthly. The most recent releases landed on September 22, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | SmileDiary | Aligner Wear Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Monthly |
| Monetization | Freemium | — |
| Size | 12 MB | 6 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Nanjing Xiaowei Technology Co., Ltd.](https://appshunter.io/developer/1831757763) | [Karol Jaworski](https://appshunter.io/developer/1799974477) |

## What reviewers say

### SmileDiary

[App page](https://appshunter.io/ios/app/smilediary-aligner-tracker/id6753011249)

This app helps you track your clear aligner treatment privately and securely. It offers a smart wear timer, visual calendar, progress photos, and detailed insights into your compliance, all without collecting your personal data.

**Highlights:** Private data storage, No registration required, Smart wear timer, Visual compliance calendar, Guided progress photos, Detailed treatment insights, Data export functionality

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SmileDiary Pro Monthly | $2.99 | per month |
| SmileDiary Pro Annual | $12.99 | per year |
| SmileDiary Pro Lifetime | $19.99 | one-time |


### Aligner Wear Timer

[App page](https://appshunter.io/ios/app/aligner-wear-timer-tray/id6765633330)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tray Pro Monthly | $4.99 | per month |
| Tray Pro Yearly | $39.99 | per year |
| Tray Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is SmileDiary free?

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

### Is Aligner Wear Timer free?

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

### Do SmileDiary or Aligner Wear Timer have ads?

Neither SmileDiary nor Aligner Wear Timer shows ads.

### Which is updated more often, SmileDiary or Aligner Wear Timer?

SmileDiary ships an update every 5 days, and Aligner Wear Timer monthly. Most recently, SmileDiary was updated on September 22, 2026 and Aligner Wear Timer on September 20, 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.*