# Smile Train vs Gnathic

Smile Train and Gnathic are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Smile Train ships an update every 4 months, Gnathic every 6 months. The most recent releases landed on August 14, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Smile Train | Gnathic |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 6 months |
| Size | 64 MB | 43 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [BioDigital, Inc.](https://appshunter.io/developer/581713012) | [David A. Tesini DMD and ASSOC, LLC](https://appshunter.io/developer/1166925511) |

## What reviewers say

### Smile Train

[App page](https://appshunter.io/ios/app/smile-train/id1508571431)

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

**In-app purchases:** none


### Gnathic

[App page](https://appshunter.io/ios/app/gnathic/id6475725359)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Smile Train free?

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

### Is Gnathic free?

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

### Do Smile Train or Gnathic have ads?

Neither Smile Train nor Gnathic shows ads.

### Which is updated more often, Smile Train or Gnathic?

Smile Train ships an update every 4 months, and Gnathic every 6 months. Most recently, Smile Train was updated on August 14, 2026 and Gnathic on September 14, 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.*