# The90 Gem vs Fitmo

The clearest difference is in-app purchases: The90 Gem at none against Fitmo's 2. The90 Gem also leads on iOS requirement (15.0 vs 17.0). Fitmo's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Fitmo sells 2 in-app purchases, starting at $11.99 per year. The90 Gem asks for nothing beyond the download.

The90 Gem ships an update every 3 weeks, Fitmo every 4 days. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | The90 Gem | Fitmo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (9 ratings)](https://appshunter.io/ios/app/the90-gem/id6758100822/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | Free | — |
| Size | 112 MB | 377 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [The90, Inc.](https://appshunter.io/developer/1870863367) | [旻鉴 胡](https://appshunter.io/developer/1884779992) |

## What reviewers say

### The90 Gem

[App page](https://appshunter.io/ios/app/the90-gem/id6758100822)

This jewelry-inspired sensor tracks your skin's real-time UV exposure. It helps you protect against aging and harness the sun's health benefits.

**Highlights:** Real-time UV tracking, Skin exposure monitoring, Aging protection, Sun health benefits, Jewelry-inspired design

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

**In-app purchases:** none


### Fitmo

[App page](https://appshunter.io/ios/app/fitmo-workout-tracker/id6802962429)

**Features:** Apple Watch app, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fitmo Pro Annual | $11.99 | per year |
| Fitmo Pro Annual | $11.99 | per year |


## Frequently asked questions

### Is The90 Gem free?

The90 Gem is free to download, with no in-app purchases.

### Is Fitmo free?

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

### Do The90 Gem or Fitmo have ads?

Neither The90 Gem nor Fitmo shows ads.

### Which is updated more often, The90 Gem or Fitmo?

The90 Gem ships an update every 3 weeks, and Fitmo every 4 days. Most recently, The90 Gem was updated on October 31, 2026 and Fitmo on November 6, 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.*