Look, we all know someone who wears a beautiful vintage Rolex or Omega but keeps glancing at their phone every five minutes to check their step count. Or maybe you’re that person. There’s this weird tension happening right now between watch lovers who appreciate the craft and heritage of mechanical timepieces and those of us who genuinely need the convenience of a smartwatch to get through the day. Enter Smartlet, a Paris-based startup that’s decided this whole either-or situation is kind of ridiculous.
The Smartlet dual-watch strap does exactly what it sounds like. It lets you wear both a traditional watch and a smartwatch on the same wrist, simultaneously. One sits on top of your wrist like normal, the other hides underneath. Flip your wrist one way to check the time on your classic timepiece, flip it the other way to see your notifications, heart rate, or whether you’ve hit your daily movement goal.
Designer: David Ohayon for
Created by engineer David Ohayon, who himself couldn’t decide between his beloved mechanical watches and the practical features of modern smartwatches, the Smartlet system uses a patented modular design that lets you clip and unclip watches in seconds without any tools. The strap itself is made from stainless steel and comes in different finishes (Classic, Shadow, and Titanium), so it’s not trying to look like some weird tech gadget. It actually resembles a regular metal watch bracelet, which means it won’t clash with the aesthetic of luxury timepieces.
Now, before you start imagining some clunky contraption, the total weight of the setup sits between 60 and 100 grams with both watches attached, which is comparable to most steel bracelets already on the market. The thickness is between 9 and 12mm, compared to 4 to 8mm for classic watches, so yes, it’s noticeably thicker but not absurdly so.
The system is compatible with watches that have 20mm or 22mm lug widths, which includes iconic brands like Omega, Tudor, Tag Heuer, Rolex, Breitling, and Zenith. On the smartwatch side, it works with Apple Watch, 41mm Google Pixel Watch, various Samsung Galaxy Watch models, and even fitness trackers like Whoop 4 and Fitbit Charge. So whether you’re Team Apple or Team Android, there’s room for you here.
But here’s the thing about Smartlet that gets interesting. It’s not just about convenience, it’s about something deeper that watch enthusiasts understand. There’s emotional value in wearing a watch your grandfather gave you, or a piece you saved up for years to buy. These watches tell stories and carry memories. Yet in 2025, we’re also living in a world where contactless payments, fitness tracking, and instant notifications have become genuinely useful features we don’t want to give up.
The Smartlet has already won a bronze medal at the prestigious Concours Lépine 2025, a French innovation competition that’s been recognizing inventions since 1901. It’s also been featured across major watch publications and tech outlets, with some calling it a potential game-changer for the industry.
Of course, there are practical considerations. Wearing a smartwatch on the underside of your wrist means it’s in regular contact with desks, armrests, and tables, which could lead to scratches or damage. And aesthetically, this is clearly designed for people who want the best of both worlds without compromise, which admittedly might not be everyone. The marketing does lean heavily into “modern gentleman” territory, but honestly, the concept itself is pretty gender-neutral. Anyone who loves watches and also wants smart features could find this useful, whether you’re tracking workouts, managing notifications during meetings, or just want your health data without sacrificing style.
What makes Smartlet genuinely clever is that it doesn’t ask you to choose. It recognizes that technology and tradition aren’t enemies, they’re just different tools for different needs. You can protect your luxury watch from daily wear by keeping it underneath while your smartwatch handles the heavy lifting on top. Or you can showcase your mechanical masterpiece while discreetly monitoring your fitness data from below.
Is it for everyone? Probably not. But for the growing number of people caught between worlds, wanting both the soul of traditional watchmaking and the brains of modern tech, Smartlet offers something genuinely new. It’s a design solution that says you don’t have to pick a side anymore. Your wrist, your rules.
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