BT21 vs Watergate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BT21
Read full descriptionHide full description
Customise your 7 day heating schedule faster than ever before with the BT21 app. Connect via bluetooth and control all of your thermostat settings quickly and easily. Once you've set up one thermostat, copy and paste all of your settings to another thermostat with easy presets. - Quick and easy heating schedule. - Copy presets to multiple thermostats. - View temperature data for the last 7 hours. - View %heating time for the last 7 days. - Send remote technical reports. - Manage temperature limits and calibration. - Set and manage all thermostat settings. - Connect to a wireless sensor (sold separately). - Lockdown mode to prevent tampering. - Hide unwanted thermostats. - Switch between heating, snow melting and power limit modes. - Switch between air, floor and remote sensors. - Access to online user guides and videos.
Watergate
Read full descriptionHide full description
Sonic is the smartest leak stopper ever designed. Using cutting-edge AI and HD Ultrasonic sensing technology, Sonic detects and prevents leaks throughout a whole home or business. The Watergate companion app lets you check up on your home from anywhere in the world and alerts you automatically if something looks wrong.
Screenshots
Verdict
The clearest difference is update cadence: Watergate at every 8 days against BT21's every 10 months. BT21's advantage is iOS requirement (12.4 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
BT21 ships an update every 10 months, Watergate every 8 days. The most recent releases landed on September 29, 2026 and October 25, 2026 respectively.
| Parameter | BT21 | Watergate |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 10 months | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.4 — better | 16.6 |
| Further details — not scored | ||
| Size | 23 MB | 95 MB |
| Age rating | 4+ | 4+ |
| Developer | Thermogroup UK | Watergate Europe Sp. z o.o. |
In-app purchases
BT21
No in-app purchases
Watergate
No in-app purchases
