# SECTRON GSM Key vs BMR Heating Control

The clearest difference is update cadence: BMR Heating Control at every 2 months against SECTRON GSM Key's every 7 months. SECTRON GSM Key's advantage is iOS requirement (12.0 vs 15.0). 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.

SECTRON GSM Key ships an update every 7 months, BMR Heating Control every 2 months. The most recent releases landed on October 3, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | SECTRON GSM Key | BMR Heating Control |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Size | 7 MB | 12 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SECTRON s.r.o.](https://appshunter.io/developer/1448669971) | [BMR s.r.o.](https://appshunter.io/developer/1515894838) |

## What reviewers say

### SECTRON GSM Key

[App page](https://appshunter.io/ios/app/sectron-gsm-key/id1448669972)

**Features:** macOS Compatibility

**In-app purchases:** none


### BMR Heating Control

[App page](https://appshunter.io/ios/app/bmr-heating-control/id1515894839)

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

**In-app purchases:** none


## Frequently asked questions

### Is SECTRON GSM Key free?

SECTRON GSM Key is free to download, with no in-app purchases.

### Is BMR Heating Control free?

BMR Heating Control is free to download, with no in-app purchases.

### Do SECTRON GSM Key or BMR Heating Control have ads?

Neither SECTRON GSM Key nor BMR Heating Control shows ads.

### Which is updated more often, SECTRON GSM Key or BMR Heating Control?

SECTRON GSM Key ships an update every 7 months, and BMR Heating Control every 2 months. Most recently, SECTRON GSM Key was updated on October 3, 2026 and BMR Heating Control on October 11, 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.*