# IOT System vs Letopis

The clearest difference is iOS requirement: IOT System at 14.0 against Letopis's 26.0. 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.

IOT System ships an update every 3 days, Letopis every 2 days. The most recent releases landed on September 12, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | IOT System | Letopis |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 days | **Every 2 days** |
| Size | 3 MB | 36 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Mac |
| Age rating | 17+ | 17+ |
| Developer | [ITFORCE TECHNOLOGY DMCC](https://appshunter.io/developer/1777732762) | [Sergey Makarov](https://appshunter.io/developer/6777051498) |

## What reviewers say

### IOT System

[App page](https://appshunter.io/ios/app/iot-system/id6748664703)

**Features:** macOS Compatibility

**In-app purchases:** none


### Letopis

[App page](https://appshunter.io/ios/app/letopis/id6777051316)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is IOT System free?

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

### Is Letopis free?

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

### Do IOT System or Letopis have ads?

Neither IOT System nor Letopis shows ads.

### Which is updated more often, IOT System or Letopis?

IOT System ships an update every 3 days, and Letopis every 2 days. Most recently, IOT System was updated on September 12, 2026 and Letopis on September 13, 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.*