On the wrist

Every watch tells a story. Every strap changes it.

The Smartlet Journal covers watch strap compatibility, modular wearables, and the collector's question that started it all: mechanical watch or smartwatch? Our answer: both.

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On the wrist

Breitling Navitimer and Apple Watch: which references fit - Smartlet

Breitling Navitimer and Apple Watch: which references fit

A slide rule on the bezel, a sensor under the case. Most Navitimers take a Smartlet, a few do not, and the difference is five...
Spring bar replacement: a watch collector's guide - Smartlet

Spring bar replacement: a watch collector's guide

Master spring bar replacement with this collector's guide covering precise measurement, quality tool selection, step-by-step installation, and troubleshooting for mechanical watches. ...
How to wear a smartwatch with a luxury watch safely - Smartlet

How to wear a smartwatch with a luxury watch safely

Learn how to wear a smartwatch and luxury watch together safely without scratches using modular strap systems, proper materials, and proven techniques. ...
Sony Wena discontinued in 2026: Smartlet is the best alternative - Smartlet

Sony Wena discontinued in 2026: Smartlet is the best alternative

Sony ended Wena 3 support in 2026, leaving users without smart features. Discover why Smartlet's modular design offers a superior alternative for watch enthusiasts. ...
Omega Seamaster and Apple Watch: Can You Wear Both in 2026? - Smartlet

Omega Seamaster and Apple Watch: Can You Wear Both in 2026?

Discover how to wear your Omega Seamaster and Apple Watch together on one wrist in 2026 with modular bands, material options, and expert wearing tips....
What is lug width and how to measure it - Smartlet

What is lug width, and how to measure yours

Lug width is the distance between the two lugs of a watch, where the strap or bracelet attaches, measured in millimetres. Here is how to...
How to wear a Rolex and Apple Watch together in 2026 - Smartlet

How to wear a Rolex and Apple Watch together in 2026

Discover how to comfortably wear your Rolex Submariner and Apple Watch simultaneously using modular solutions that blend mechanical heritage with smart technology. ...
Marathon training and HRV monitoring between runs - Smartlet

Marathon training and HRV: the hours between the runs

HRV-guided training is one of the best-studied ideas in endurance coaching, and it depends on near-daily data. Why the useful measurements happen away from the...
Smartwatch heart monitoring and atrial fibrillation evidence - Smartlet

Smartwatch heart monitoring: what the evidence actually shows

Atrial fibrillation affects more than 52 million people, many without symptoms. What smartwatch rhythm alerts can and cannot do, according to the largest studies, and...
How smartwatch sensors work under the wrist - Smartlet

How smartwatch sensors work, and what changes under the wrist

Optical heart rate does not care which way is up, but it cares a great deal about contact, motion and fit. What the physics says,...
Watch strap weight: the Smartlet compared with a steel bracelet - Smartlet

Watch strap weight: what the Smartlet really adds to your wrist

With the connected device, the Smartlet weighs 85 to 95 g, inside the 60 to 100 g range of a standard steel bracelet. Where those...
Watch strap comfort for daily dual wear, measured in millimetres - Smartlet

Watch strap comfort: the millimetres you already wear

Is a bracelet that carries two watches comfortable from morning to night? The real numbers, what sits under your wrist, and why fit matters more...
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