# SmileDiary vs AlignerTime

The clearest difference is rating: AlignerTime at 4.4 against SmileDiary's 1.0. AlignerTime also leads on ratings volume (8 vs 1). SmileDiary's advantage is update cadence (every 5 days vs every 3 weeks). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. SmileDiary sells 3 in-app purchases, starting at $2.99 per month and AlignerTime sells 6 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

AlignerTime holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: AlignerTime has 8 ratings behind it against 1, so its average is the more settled of the two.

SmileDiary ships an update every 5 days, AlignerTime every 3 weeks. Both last shipped on October 28, 2026.

## The numbers

| Metric | SmileDiary | AlignerTime |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/smilediary-aligner-tracker/id6753011249/reviews) | **[4.4 (8 ratings)](https://appshunter.io/ios/app/alignertime-aligner-tracker/id6762070275/reviews)** |
| Number of ratings | 1 | **8** |
| Positive reviews | — | 88.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | Freemium | Freemium |
| Size | 12 MB | 90 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [Nanjing Xiaowei Technology Co., Ltd.](https://appshunter.io/developer/1831757763) | [卓学 陈](https://appshunter.io/developer/1892756052) |

## 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 | $29.99 | one-time |


### AlignerTime

[App page](https://appshunter.io/ios/app/alignertime-aligner-tracker/id6762070275)

Track your clear aligner or retainer wear time with a simple timer and photo timeline. Manage tray changes, build consistent habits, and visualize your smile's progress privately on your device.

**Highlights:** Aligner wear time tracking, Tray change management, Progress photo timeline, Daily wear habit building, Gentle reminders, Private, on-device data storage

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BraceTime Pro Monthly | $1.99 | per month |
| Monthly Subscription | $3.99 | per month |
| BraceTime Pro Annual | $23.99 | per year |
| Yearly Subscription | $29.99 | per year |
| BraceTime Pro Lifetime | $24.99 | one-time |
| Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is SmileDiary free?

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

### Is AlignerTime free?

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

### Which has better reviews, SmileDiary or AlignerTime?

AlignerTime is rated higher. SmileDiary averages 1.0 out of 5 from 1 ratings, while AlignerTime averages 4.4 from 8 ratings.

### Do SmileDiary or AlignerTime have ads?

Neither SmileDiary nor AlignerTime shows ads.

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

SmileDiary ships an update every 5 days, and AlignerTime every 3 weeks. Most recently, SmileDiary was updated on October 28, 2026 and AlignerTime on October 28, 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.*