# FIDOSmart vs Four

The clearest difference is iOS requirement: Four at 12.0 against FIDOSmart's 14.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | FIDOSmart | Four |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 101 MB | 58 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [FIDO TECH UK](https://appshunter.io/developer/1551125549) | [Xiamen Sixin IoT Technology Co., Ltd.](https://appshunter.io/developer/1438611291) |

## What reviewers say

### FIDOSmart

[App page](https://appshunter.io/ios/app/fidosmart/id6446594310)

**Features:** macOS Compatibility

**In-app purchases:** none


### Four

[App page](https://appshunter.io/ios/app/four-faith-sensor-cloud/id6451084198)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FIDOSmart free?

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

### Is Four free?

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

### Do FIDOSmart or Four have ads?

Neither FIDOSmart nor Four shows ads.

### Which is updated more often, FIDOSmart or Four?

FIDOSmart ships an update every 2 months, and Four every 2 months. Most recently, FIDOSmart was updated on October 25, 2026 and Four on October 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.*