Comparison

Watchlog Bluetooth vs Bolt Boiler

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

Watchlog Bluetooth

Bluetooth Data Collection App

About

Watchlog Bluetooth

This application facilitates Bluetooth connections for data collection from specific sensors. It is designed to work seamlessly with Hydrotechnik sensors, enabling efficient data transfer and management.

Highlights

Bluetooth connectivity
Hydrotechnik sensor support
Data collection
Data management

Features

Read full description

Bluetooth connection app for use with Hydrotechnik sensors.

About

Bolt Boiler

Features

Read full description

Connect to your Bolt boiler to select heating and hot water temperatures, choose your boiler's mode, control battery charging schedules, use smart tariff features, and more!

Screenshots

Watchlog Bluetooth4 screens

Bolt Boiler4 screens

Verdict

The call

The clearest difference is update cadence: Watchlog Bluetooth at every 2 months against Bolt Boiler's every 9 months. Watchlog Bluetooth also leads on iOS requirement (13.0 vs 15.1). 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Watchlog Bluetooth ships an update every 2 months, Bolt Boiler every 9 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 6 level

Watchlog Bluetooth versus Bolt Boiler: the parameters behind the verdict, then further details
Parameter	Watchlog Bluetooth	Bolt Boiler
Price	Free	Free
Positive reviews	100.0% of reviews	—
Update frequency	Every 2 months — better	Every 9 months
Ads	No	No
In-app purchases	No	No
Monetization	Free	—
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	13.0 — better	15.1
Further details — not scored
Size	25 MB	49 MB
Age rating	4+	4+
Developer	Hydrotechnik UK Test Engineering Ltd	BRITISH R&D LIMITED

In-app purchases

None

Watchlog Bluetooth

No in-app purchases

None

Bolt Boiler

No in-app purchases

Questions

Is Watchlog Bluetooth free?

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

Is Bolt Boiler free?

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

Do Watchlog Bluetooth or Bolt Boiler have ads?

Neither Watchlog Bluetooth nor Bolt Boiler shows ads.

Which is updated more often, Watchlog Bluetooth or Bolt Boiler?

Watchlog Bluetooth ships an update every 2 months, and Bolt Boiler every 9 months. Most recently, Watchlog Bluetooth was updated on November 4, 2026 and Bolt Boiler on October 30, 2026.