# SmileDiary vs Align

The clearest difference is in-app purchases: Align at none against SmileDiary's 3. SmileDiary's advantage is update cadence (every 5 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

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

SmileDiary ships an update every 5 days, Align every 3 weeks. The most recent releases landed on September 22, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | SmileDiary | Align |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/align-clear-aligner-tracker/id6765844379/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | Freemium | **Free** |
| Size | 12 MB | 27 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nanjing Xiaowei Technology Co., Ltd.](https://appshunter.io/developer/1831757763) | [Ethem Ozcan](https://appshunter.io/developer/453395447) |

## 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 |


### Align

[App page](https://appshunter.io/ios/app/align-clear-aligner-tracker/id6765844379)

This app helps users consistently track their clear aligner wear time and receive smart reminders for wearing, removing, and switching aligners. It provides progress tracking to keep users motivated throughout their treatment journey with a clean and minimal design.

**Highlights:** Clear aligner wear time tracking, Smart aligner reminders, Treatment progress tracking, Clean and minimal design, Daily use focus

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

**In-app purchases:** none


## Frequently asked questions

### Is SmileDiary free?

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

### Is Align free?

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

### Do SmileDiary or Align have ads?

Neither SmileDiary nor Align shows ads.

### Which is updated more often, SmileDiary or Align?

SmileDiary ships an update every 5 days, and Align every 3 weeks. Most recently, SmileDiary was updated on September 22, 2026 and Align on September 10, 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.*