# HeatX vs U

The clearest difference is update cadence: U at every 3 days against HeatX's every 3 months. U also leads on iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

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

HeatX ships an update every 3 months, U every 3 days. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | HeatX | U |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 49 MB | 37 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Heat Experience](https://appshunter.io/developer/1531069538) | [Guangdong Crystal Island Healthwise Co.,Ltd](https://appshunter.io/developer/1585126989) |

## What reviewers say

### HeatX

[App page](https://appshunter.io/ios/app/heatx/id1531069536)

**Features:** Vision Pro support

**In-app purchases:** none


### U

[App page](https://appshunter.io/ios/app/u-spa/id1585126987)

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

**In-app purchases:** none


## Frequently asked questions

### Is HeatX free?

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

### Is U free?

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

### Do HeatX or U have ads?

Neither HeatX nor U shows ads.

### Which is updated more often, HeatX or U?

HeatX ships an update every 3 months, and U every 3 days. Most recently, HeatX was updated on October 7, 2026 and U on October 2, 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.*