# Smart Heat vs Fy Ring

The clearest difference is update cadence: Fy Ring at fortnightly against Smart Heat's every 22 months. Smart Heat's advantage is iOS requirement (12.0 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.

Smart Heat ships an update every 22 months, Fy Ring fortnightly. The most recent releases landed on September 29, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Smart Heat | Fy Ring |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Fortnightly** |
| Size | 27 MB | 77 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CAOS SRL](https://appshunter.io/developer/1630947069) | [MedVigilance Inc.](https://appshunter.io/developer/1452991546) |

## What reviewers say

### Smart Heat

[App page](https://appshunter.io/ios/app/smart-heat/id1630947067)

**Features:** macOS Compatibility

**In-app purchases:** none


### Fy Ring

[App page](https://appshunter.io/ios/app/fy-ring/id6449668673)

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

**In-app purchases:** none


## Frequently asked questions

### Is Smart Heat free?

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

### Is Fy Ring free?

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

### Do Smart Heat or Fy Ring have ads?

Neither Smart Heat nor Fy Ring shows ads.

### Which is updated more often, Smart Heat or Fy Ring?

Smart Heat ships an update every 22 months, and Fy Ring fortnightly. Most recently, Smart Heat was updated on September 29, 2026 and Fy Ring on October 4, 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.*