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Essential tools and reference for watch enthusiasts.
Precision tools and encyclopedic reference for watch enthusiasts and horologists. Track moon phases, explore thousands of calibers, compare watches, and learn the craft.
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From the watch world
Watch Service in 2026: Realistic Timelines for the Major Manufactures
Service is the cost of ownership most new collectors underestimate. A practical guide to realistic service timelines and costs at Rolex, Tudor, Omega, Patek Philippe, Audemars Piguet, A. Lange & Söhne, JLC, and IWC, plus the authorized vs independent watchmaker tradeoff.
By Thomas Kell · May 6
Headlines
Richemont FY 2026 Preview: What to Watch When the Watch Division Reports
James Harlow · May 6
How to Buy at a Geneva Watch Auction: A Primer for New Collectors
Thomas Kell · May 4
Raul Pages: The AHCI Maker Who Won the Louis Vuitton Watch Prize
Nadia Ostroff · May 4
Watches on Screen: A Brief History of Horology in Cinema
Sophie Clement · May 4
F1 Miami GP and the TAG Heuer Era: Watch Sponsorship in 2026 Formula 1
Marcus Veil · May 4
AHCI Geneva Days 2026: The Independent Watchmaking Moment
The Académie Horlogère des Créateurs Indépendants holds its Geneva Days during the spring auction week in May. After Raul Pages's Louis Vuitton Watch Prize win in 2024 and a string of independent results at recent auctions, the timing in 2026 looks pivotal.
Sophie Clement · Apr 28
Geneva Spring Auctions Preview: What to Watch in May 2026
Phillips, Sotheby's, and Christie's converge on Geneva in mid-May for their spring watch auctions. The post-Watches and Wonders sales will test whether the independent outperformance seen in New York carries over to Geneva.
James Harlow · Apr 28
Cartier's Crash Skeleton: 150 Pieces of an Asymmetric Icon
Cartier introduced a new skeletonized version of the Crash at Watches and Wonders 2026, limited to 150 numbered pieces, exposing the in-house manufacture caliber while preserving the asymmetric melted-clock case shape that has defined the line since 1967.
Nadia Ostroff · Apr 26
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Moon Phase Visualizer & Drift Calibrator
Is your moonphase still accurate?
Your moonphase complication tracks a 29.53-day lunar cycle. Our drift calculator tells you exactly how far it’s drifted and when to correct it. Plus, track upcoming eclipses, blood moons, supermoons, and traditional moon names.
Open Phase VisualizerMovement Database
Every caliber, searchable
Search across hundreds of watch movements and their complete specifications. Frequency, jewel count, power reserve, dimensions - discover movement lineage across brands and verify what powers your watch.
Browse MovementsWatch Comparison
Side-by-side, spec-by-spec
Place any two watches side by side. Case dimensions, movement specifications, water resistance, pricing - everything you need to make an informed decision, laid out for direct comparison.
Compare WatchesFree Tools
Built for watch owners
Interactive tools that solve real problems. Track your accuracy, check water resistance ratings, calculate service intervals, visualize watch sizes on your wrist, and more. No account needed, no data leaves your browser.
Learn Horology
The watch encyclopedia
In-depth articles on how movements work, what complications do, materials science, and practical care guides. Written by horologists, grounded in verified technical data. No marketing fluff.
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Find your watch
Search across our entire database of watches, movements, and brands.