Toolwatch - Watch accuracy app

749 reviews
Content rating
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About this app

Measure and track the accuracy of your mechanical watches. Toolwatch is a free watch accuracy app trusted by the watchmaking industry's leaders and over 65,000 monthly users. Is your watch accurate? Should it be serviced? Is your watch magnetized? How does it compare versus other watches? Find out now by measuring the accuracy of your watch!

Toolwatch also brings to you the best tips, tailored on your watch for taking care of your watch collection.

"I had the feeling my watch was running late, now I am sure thanks to Toolwatch and I could get my watch serviced for free as it was still under warranty!" - Benjamin Baudisson, Vacheron Constantin

"As a watch collector, knowing when to service my watch is crucial. Toolwatch helps me taking care of my mechanical watches." - Alex Ghotbi, Watch Specialist and Associate Director at Phillips Auctions.

As seen on ABlogToWatch, FratelloWatches, Theo & Harris, WristReview, Europa Star and more.

Find out now if your watch is accurate, it is FREE using Toolwatch mobile app.
Updated on
May 28, 2017

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, App activity, and Device or other IDs
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

725 reviews
A Google user
July 26, 2019
It appears the time sync with the aromic clock is not accurate or has a lag. this causes huge swings in calculated "accuracy" of watches. My quartz was running +1.1 seconds which was probably close to correct, the next day it says its 102 seconds fast. I rechecked it with the atomic clock on the internet and it was spot on. If it was consistent this would be a great app, unfortunately, its not worth it if it cannot do its job well.
11 people found this review helpful
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Martin Brilliant
May 2, 2021
Tap the button when the second hand reaches 12? I'm using an old pocket watch that doesn't have (never had) a second hand! This app is totally useless! No, it's NOT useless. The width of the minute hand is the same as the width of the minute marks on the dial, and if I watch the watch with a loupe I can tell to the second when the minute hand is pointing exactly at a mark. It will work—especially since the watch was built as a "dollar watch" and isn't all that accurate to begin with.
4 people found this review helpful
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Feri Hermawan
January 11, 2024
New findings: after solving the problem with signing in, now time anchor for so called "accuracy checking" is very inconsistent everytime you open this app. Hence, the accuracy result is swinging extremely. One time it's spot on, next check within a week says -10, and then going to +12 another week. Note here that i'm measuring a Spring Drive movement, which is consistently gain/loss only 1 second per every month when comparing with the atomic clock for the last 4 month.
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What's new

In this version, we focused on bug fixes. In details:

- Watches with more than 1 and less than 2 measures were not properly displayed;
- The autocompletion on calibres wasn't available;
- Errors messages weren't displayed properly;
- Wrong password on login was crashing the app.