The last thing you want to do after spending hundreds of dollars on a wearable item is to find out it doesn’t work with your body. But, since the advent of smartwatches and fitness trackers, this is becoming a very common problem for people who have tattoos on their wrists. As device support pages and countless posts on Reddit have documented over the years, tattooed skin and sensors used by wearables often don’t mix well.
One of the main problems people experience is heart rate sensing. Wearable devices use a light-based technology called photoplethysmography (PPG) to measure heart rate. When you turn your device you see the same green light. But, tattoos can get in the way of that light, which can distort the readings. The second problem is wrist detection, which also uses light to determine that the tracker is on a person’s wrist (along with accelerometers and electrical sensors). Slap a fitness tracker on a tattoo-covered wrist, and the device won’t be able to register that it’s being worn at all, resulting in the wearer having to repeatedly unlock the device whenever they want to interact with it.
It may seem a little silly that technology has advanced enough to take gesture control and provide personalized sleep coaching, but there may be a slight downside, but the tattoo issue isn’t just a baseless complaint that consumers have latched onto. Device manufacturers have acknowledged this and advise buyers to avoid placing their trackers over tattoos.
“Tattoos (ink, patterns, saturation) can block heart rate sensor light, causing inaccurate or missing readings,” Garmin writes on a support page. “For best performance, wear the watch without tattoos on the skin if possible.” Apple has issued similar notices following the release of the first Apple Watch.
Is there any solution?
Tattooed people have devised a variety of solutions to get the most from their smart watches and fitness trackers, though none are perfect. The simplest? If you don’t have a tattoo on the inside of your wrist (or at least have large areas of clear skin), you can place the device there instead of on the top of the wrist. Similarly, if your other wrist is tattoo-free, wear the device on that. But if you have become accustomed to wearing a watch on a fixed wrist for years, it will feel very strange to change it.
As a quick fix, some people swear by applying epoxy bottle cap stickers or pieces of clear tape, either of which is placed over the sensor and inexplicably fixes the problem for many wearers. Reusable accessories designed to work in the same manner have also had some success. If you just want accurate heart rate tracking – and if you don’t have a chest tattoo, there’s also the option to use a chest strap. Still, this isn’t the most comfortable or convenient way to use a wearable in most everyday situations.
Ultimately, this will continue to be a problem until the sensors these watches and fitness trackers rely on are improved to account for skin variations like tattoo ink. Similarly, light-based sensors have been found to be less reliable for people with darker skin, highlighting the need for greater diversity in the research and development of this type of technology.
Anecdotally, it looks like Google’s Pixel Watch 4 may be a lot better at handling tattooed skin than its predecessors. There were rumors a few years ago of Samsung introducing an update to improve things in this area, but complaints from tattooed Galaxy Watch users suggest otherwise.
More research is needed
Identifying the problem is theoretically the first step to solving it, but the reality is that how much the tattoo interferes with the sensor readings is not consistent in every case. A study published in 2025 attempted to measure the difference in readings taken from devices worn on tattooed skin versus non- tattooed skin, and although it found that the former had inaccuracies, the results were mixed.
The researchers used Polar Verity Sense and the armband, having participants wear a device over the tattoo and a device on the same arm in a tattoo-free area. To establish a baseline, participants also wore a Polar H10 chest strap heart rate monitor, as this style of wearable is considered more accurate. Over the course of a day, they were monitored while they rested, walked at their own pace, and jogged.
This showed that the presence of the tattoo had an effect on heart rate readings, but it depended on the wearer’s level of activity, with “the greatest effect seen at rest and variation decreasing as exercise intensity increased.” And in some cases, the researchers note, “the presence of a tattoo on the arm did not affect heart rate validity measurements at all.” There are many variables that must be taken into account – such as ink colour, saturation and depth – and as things stand today, there has not yet been enough research into the specifics of the problem to come up with a solution.
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