LoupeLabLoupeLab
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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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.
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Free 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.