Coin-sized Device Turns Watches into Smartwatches

Ganance made a coin-sized watch sensor for steps and notifications.

Image credits: Ganance

Watch enthusiasts must decide whether to forgo fitness monitoring and notifications completely or give up the style of mechanical clocks in favor of smartwatch capabilities. This problem is solved by the Ganance Heir's coin-sized sensor, which turns any analog watch into a smart gadget without sacrificing its visual attractiveness. This microsuction-attached tracker adds the connectivity that modern living requires while maintaining the aspects of classic watches that you adore.

Ganance says it's working on intentional technology that respects your attention. As such, the Heir doesn't have a screen or require a subscription to use; it simply beams the data from your physical activity to a mobile app, where you can review your progress over time, reports New Atlas.

There are no magnets in the Heir that might cause your mechanical watch to malfunction. It is currently best suited for walking and running because it just records steps, distance, and calories. This data can be found in both Apple Health and the Ganance iPhone app.

You may also skip tracks with two taps and manage media playback with one tap. Additionally, the gadget will vibrate to let you know when you get texts and calls. Both the app and the sensor itself have options to deactivate tap input, and there are three different vibration strength settings.

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With a diameter of 30 mm, the Heir will suit most men's watches. Its thickness of 3 mm and weight of 0.17 oz (5 g) should make it quite inconspicuous when affixed to your watch's caseback. According to the business, switching between watches only requires a few seconds of effort.

Unfortunately, if you plan to use it frequently, you will need to top it off almost daily using the proprietary dock because it only lasts 42 hours on a single charge.

Let's take an example where you could use the Heir's tracking features but don't want to wear your expensive watch to the gym. An HeirBand, a wearable strap featuring a slot for the gadget, is available. This allows you to track your steps and get alerts without getting perspiration on your watch strap.

According to the company, an Android app is being developed and will be shipped in late June along with the next shipment of Heir orders. The Heir will then be able to share data with Android-based fitness apps by syncing data to Google's Health Connect infrastructure.

Sam Draper
April 20, 2026

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