# mC HT500SET vs BT21

The clearest difference is update cadence: mC HT500SET at every 2 months against BT21's every 10 months. 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.

mC HT500SET ships an update every 2 months, BT21 every 10 months. The most recent releases landed on October 24, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | mC HT500SET | BT21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/mc-ht500set/id1489433682/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Free | — |
| Size | 83 MB | 23 MB |
| Requires iOS | **12.0** | 12.4 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ISIPARK IC VE DIS TICARET INSAAT ISITMA SISTEMLERI OTOMOTIV SANAYI ANONIM SIRKETI](https://appshunter.io/developer/1289067142) | [Thermogroup UK](https://appshunter.io/developer/915777303) |

## What reviewers say

### mC HT500SET

[App page](https://appshunter.io/ios/app/mc-ht500set/id1489433682)

Control your home's heating remotely with this smart thermostat app. Save on energy bills by setting custom schedules and utilizing location-based temperature adjustments. Manage multiple homes and share control with family members.

**Highlights:** Remote temperature control from anywhere, Daily and weekly scheduling, Six distinct operating modes, Location-based temperature adjustments, Historical heating reports, Multi-home and family sharing

**Features:** macOS Compatibility

**In-app purchases:** none


### BT21

[App page](https://appshunter.io/ios/app/bt21/id1561931603)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is mC HT500SET free?

mC HT500SET is free to download, with no in-app purchases.

### Is BT21 free?

BT21 is free to download, with no in-app purchases.

### Do mC HT500SET or BT21 have ads?

Neither mC HT500SET nor BT21 shows ads.

### Which is updated more often, mC HT500SET or BT21?

mC HT500SET ships an update every 2 months, and BT21 every 10 months. Most recently, mC HT500SET was updated on October 24, 2026 and BT21 on September 29, 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.*