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Watch tools
Eighteen tools for the questions that come up when you are buying, wearing or trying to understand a watch. Everything runs in your browser, nothing is uploaded, and none of it needs an account.
Learn how watches work
How a mechanical watch works
The whole movement, running. Slow it down until you can see individual beats, then click any part to find out what it does.
Complication explorer
Build a dial one function at a time and see what each complication does, how often you would use it, and what it costs to own.
Beat rate converter
BPH to hertz to ticks per second, with the seconds sweep animated at the real rate.
Decide what to buy
The $10k collection challenge
Seventy real watches, honest prices, one budget. Blow it all on a Submariner or build a five-watch box, then share the card.
SOTC maker
Turn your watch list into a clean state of the collection card for Reddit and the forums. Nothing leaves your browser.
Watch brand tier list
Fifty brands, six tiers, zero official answers. Rank them, download the image, and defend your choices in public.
Watch finder
Eight questions about how you actually live, then specific suggestions with the reasoning and the trade-offs shown.
Collection planner
Map what you own against the situations it needs to cover and see the shape that stays empty.
Watch size calculator
Enter your wrist size and see the recommended case diameter and maximum lug-to-lug, drawn to scale.
Watch size comparison
Two watches side by side at true relative size, from presets or your own measurements.
Watch weight calculator
How heavy the same watch is in titanium, steel, gold or platinum.
Check and authenticate
Spot the fake
Eight rounds, two watches each, one counterfeit. Every flaw is a real authentication tell.
Water resistance checker
What 30 m, 50 m, 100 m and 200 m genuinely allow, and why the number misleads.
Crystal comparison
Sapphire, mineral and acrylic on scratch resistance, shatter resistance and repairability.
Own and maintain
Service interval planner
Whether your watch is actually due, based on symptoms rather than the calendar.
Power reserve tracker
When your automatic will stop, and when accuracy starts to drop before it does.
Bracelet link calculator
How many links to remove, and which side to take them from.
Money
Cost of ownership
Purchase price plus servicing, insurance and depreciation over the years you keep it.
Collection value tracker
Total up the whole collection. Stored privately in your browser.
Read your watch
More on watches
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