That's the idea behind the Ganance Heir, a small wearable device designed for people who want the convenience of smartwatch technology without having to wear an actual smartwatch.
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| Weighing just 5 grams and measuring 3mm thick, Ganance Heir adds smartwatch features without replacing the traditional watch on your wrist. Credit: Ganance |
Developed by Chicago-based startup Ganance, the Heir takes a different approach to wearable technology.
Instead of replacing a traditional watch with a touchscreen display, it attaches to the back of an existing timepiece and quietly adds a selection of connected features.
The result is a conventional-looking watch that can track daily activity, deliver notifications and control music playback.
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| It looks like an ordinary mechanical watch, but underneath sits a sensor tracking steps, monitoring activity and delivering smartphone notifications. Credit: Ganance |
The device attaches using a technology called microsuction. Rather than relying on magnets, adhesive or a modified watch strap, it uses thousands of microscopic air pockets to create a removable grip against the watch's caseback. This allows the Heir to stay attached during everyday movement while making it possible to remove and transfer the sensor between watches without leaving adhesive residue.
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| Ganance Heir attaches to a traditional watch using microsuction, bringing connected features without magnets, adhesives or a redesigned strap. Credit: Ganance |
The absence of magnets is particularly relevant for mechanical watch owners. Traditional mechanical watches rely on carefully arranged metal components and magnetic fields can interfere with the movement's operation. By avoiding magnets entirely, Ganance says the Heir can be used with mechanical watches without introducing that particular risk.
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| Can a 5-gram sensor deliver enough smartwatch functionality to make people reconsider wearing a digital watch? Ganance thinks so. Credit: Ganance |
Physically, the device is remarkably small. It measures 30mm in diameter, is only 3mm thick and weighs approximately 5 grams. That is small enough to sit behind most modern watches without dramatically changing how they look or feel on the wrist. Ganance recommends watches with relatively flat or slightly curved casebacks, ideally those measuring more than 34mm across. Heavily engraved or textured surfaces may affect how securely the microsuction attachment holds.
Once attached, the Heir connects wirelessly to a smartphone through the Ganance mobile app. Its primary function is activity tracking, using an internal motion sensor to detect movement throughout the day. The accompanying software processes that information to estimate steps, distance travelled, calories burned and active time.
The information is then displayed in the mobile app, with support for Apple's Health ecosystem on iPhone and Google's Health Connect on Android. This means users can incorporate the activity information into the health platforms they may already use rather than relying entirely on a separate fitness-tracking application.
There is also a practical notification system. Instead of displaying incoming messages on a screen, the Heir communicates through haptic feedback. Haptics are small physical vibrations that allow a device to communicate information through touch. When a call, text or supported app notification arrives, the sensor delivers a vibration on the wrist.
Users can choose which applications are allowed to trigger alerts, with support extending to services such as WhatsApp, Slack, Microsoft Teams, Gmail and Instagram. Vibration intensity can also be adjusted, giving users some control over how noticeable notifications are throughout the day.
Music controls are built into the device as well. A single tap can play or pause media, while a double tap can skip to the next track. These gestures provide a way to interact with music playback without reaching for a phone or introducing another screen to the wrist.
The approach is consistent with Ganance's central design idea: retain the appearance of a traditional watch while moving some of the technology normally associated with smartwatches into a separate, almost invisible accessory.
However, the Heir is not designed to replace a full-featured fitness smartwatch. Its current hardware focuses primarily on movement and activity tracking rather than offering the broader collection of sensors found in dedicated health wearables. It does not have a display, built-in GPS or an optical heart-rate sensor. Its capabilities are therefore more limited than those of devices designed to monitor a wide range of exercise and health measurements independently.
Ganance is also expanding the software side of the product. Its newer mobile platform introduces Face Scan, a feature that uses the smartphone's front-facing camera to estimate more than 30 health markers in approximately 30 seconds. The technology uses remote photoplethysmography, or rPPG, which analyses tiny changes in light reflected from the skin as blood flows through it.
The company says the feature can provide measurements and estimates relating to heart rate, heart-rate variability, stress and other wellness indicators. It is also developing AI-powered coaching that uses collected information to generate personalised daily guidance, alongside expanded integrations with third-party health and fitness platforms.
These features are part of Ganance's broader software plans rather than additional sensors hidden inside the Heir itself. The distinction matters: Face Scan relies on the phone's camera, not a heart-rate sensor built into the small accessory. Ganance also describes the feature as a wellness tool, not a medical device, and its estimates should not be treated as medical diagnoses or measurements.
Battery life is another important consideration. Despite its compact dimensions, the Heir is rated for up to 42 hours of operation on a full charge. It recharges through an included USB-C charging dock, with a charging time of approximately 1.5 hours according to the company's technical specifications. That translates to charging every day or two for most users, rather than the longer intervals some dedicated fitness trackers can achieve.
The device is also splash-proof, making it suitable for ordinary exposure such as handwashing and light rain. It is not rated for swimming, showering or full submersion, so users will need to remove it before activities involving substantial water exposure.
Ganance has also developed an accessory called the HeirBand, which addresses a slightly different problem. Some people may want activity tracking and notifications during exercise but prefer not to wear their traditional watch at the gym. The HeirBand provides a lightweight strap with a dedicated slot for the sensor. Users can simply remove the Heir from their watch and transfer it into the band, without needing to purchase a second tracking device.
Pricing places the Heir below many premium smartwatches. Ganance lists it at $149 as a pre-order, compared with its stated regular price of $199. The company is currently taking reservations for its Christmas 2026 delivery batch, with a one-year limited warranty and a 14-day return window. There is also no mandatory subscription, meaning the core functionality and software updates are included with the purchase.
The more interesting question is whether this approach can deliver enough functionality to make traditional watches more practical for people who have grown accustomed to fitness tracking and smartphone notifications. The Heir does not attempt to compete with a smartwatch feature for feature. Instead, it separates the technology from the watch itself, allowing the two to serve different purposes.
That distinction could become increasingly relevant as wearable technology develops. Not everyone wants a screen on their wrist, and not everyone wants to sacrifice a mechanical or analogue watch to access basic digital features. If Ganance can make its activity tracking consistently reliable, improve its software and extend its battery life in future generations, the Heir could offer a compelling alternative to wearing two different watches. For now, its appeal rests on a simple proposition: keep the watch you already enjoy wearing, and add the technology only where you need it.
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