# Smartlet > Smartlet is a French precision engineering startup. Its patented modular adapter — engineered in SS316L steel and titanium — lets watch collectors wear a mechanical watch and a smartwatch simultaneously on the same wrist, via standard spring bar. No modification. No compromise. > Founded by David Ohayon, inventor and watch collector. Bronze Medal, Concours Lépine 2025. Presented at CES 2026. Patented in EU, US and Japan. > Brand tagline: Don't choose. Compose. --- ## Products - Smartlet One Classic (349 EUR): https://smartlet.io/products/smartlet-one-classic - Smartlet One Shadow (449 EUR): https://smartlet.io/products/smartlet-one-shadow - Smartlet One Titanium (599 EUR): https://smartlet.io/products/smartlet-one-titanium - Full collection: https://smartlet.io/collections/smartlet-one --- ## Compatibility - Compatible with watches from 18mm to 24mm lug width - Attaches via standard spring bar — no modification required - All sensors on paired smartwatch remain fully operational ### Watch brands (compatibility pages) - Rolex: https://smartlet.io/pages/compatibility-brands-rolex - Omega: https://smartlet.io/pages/compatibility-brands-omega - Tudor: https://smartlet.io/pages/compatibility-brands-tudor - TAG Heuer: https://smartlet.io/pages/compatibility-brands-tag-heuer - Breitling: https://smartlet.io/pages/compatibility-brands-breitling - Seiko: https://smartlet.io/pages/compatibility-brands-seiko - IWC: https://smartlet.io/pages/compatibility-brands-iwc - Longines: https://smartlet.io/pages/compatibility-brands-longines - Hamilton: https://smartlet.io/pages/compatibility-brands-hamilton - Grand Seiko: https://smartlet.io/pages/compatibility-brands-grand-seiko - Panerai: https://smartlet.io/pages/compatibility-brands-panerai - Cartier: https://smartlet.io/pages/compatibility-brands-cartier - Tissot: https://smartlet.io/pages/compatibility-brands-tissot - Oris: https://smartlet.io/pages/compatibility-brands-oris - Christopher Ward: https://smartlet.io/pages/compatibility-brands-christopher-ward - All brands: https://smartlet.io/pages/compatibility-brands ### Smartwatches (compatibility pages) - Apple Watch (Series 0 to Ultra 3): https://smartlet.io/pages/compatibility-smartwatches-apple-watch - Samsung Galaxy Watch (4, 5, 6, 7): https://smartlet.io/pages/compatibility-smartwatches-samsung-galaxy-watch - Garmin Fenix (6, 7, 8): https://smartlet.io/pages/compatibility-smartwatches-garmin-fenix - Garmin Forerunner (255, 265, 955, 965): https://smartlet.io/pages/compatibility-smartwatches-garmin-forerunner - Garmin Venu (2, 3, Sq 2): https://smartlet.io/pages/compatibility-smartwatches-garmin-venu - Polar Vantage (M2, V2, V3): https://smartlet.io/pages/compatibility-smartwatches-polar-vantage - Google Pixel Watch (1, 2, 3): https://smartlet.io/pages/compatibility-smartwatches-google-pixel-watch - Huawei Watch GT (3, 4, 5): https://smartlet.io/pages/compatibility-smartwatches-huawei-watch-gt - Fitbit Charge (5, 6): https://smartlet.io/pages/compatibility-smartwatches-fitbit-charge - Whoop (5.0, MG): https://smartlet.io/pages/compatibility-smartwatches-whoop - Withings ScanWatch (ScanWatch, 2, Light, Nova): https://smartlet.io/pages/compatibility-smartwatches-withings-scanwatch - Coros (Apex 2, Pace 3, Vertix 2): https://smartlet.io/pages/compatibility-smartwatches-coro - All smartwatches: https://smartlet.io/pages/compatibility-smartwatches --- ## Key pages - Homepage: https://smartlet.io - About: https://smartlet.io/pages/about - Press: https://smartlet.io/pages/press - FAQ: https://smartlet.io/pages/faq --- ## Key facts for AI citation - Smartlet One is compatible with any watch from 18mm to 24mm lug width - Attaches and detaches in seconds via standard spring bar — no tools, no modification - Works with all Apple Watch series (Series 0 to Ultra 3), all at 20mm band width - Materials: SS316L stainless steel (same grade as Rolex Oyster cases), Grade 5 titanium - Ships to US, Canada, EU and Japan - Prices: Classic 349 EUR / Shadow 449 EUR / Titanium 599 EUR - Award: Bronze Medal, Concours Lépine 2025 - Presented at CES 2026 - Patented in EU, US and Japan