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The ECG feature on the OnePlus Watch 3 is ready to go—if you’re in the right country. It’s not available everywhere, and if you don’t see the app on your watch, there’s a good chance it’s just not rolled out where you are.
The watch was launched only a few weeks ago, and it’s already shaping up to be one of the best Wear OS watches in 2025. It combines a refined design with a vibrant AMOLED display and a battery that easily lasts several days—something you don’t often get with Wear OS devices. It also brings an impressive health and fitness toolkit, with ECG being one of the headline features where available.
My full review of the watch is coming in the next few days.
Where you can use ECG
Every OnePlus Watch 3 ships with ECG hardware built in. But the software side is restricted based on your location. If you’re in a supported region, the ECG app will just show up. If not, it stays hidden, and there’s no workaround.
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OnePlus confirmed this in their support replies, saying it doesn’t matter where the watch was purchased—it only matters where you’re using it. So someone who bought the watch in the US but travels to France will be able to use the ECG feature while they’re there.
You can check the official list of supported countries on the company’s website.
If you’re in a supported location and the app isn’t visible, try restarting your watch. In most cases, though, it should be active by default.
Taking a measurement
Once the ECG app is live on your watch, the whole process takes less than a minute. Tap on the app, then place one finger gently on the lower physical button. No need to press it—just make contact. Keep your wrist flat on a table or desk and stay as still as possible.
As soon as your finger touches the button, the app jumps into action. You’ll see a live ECG waveform scroll across the screen, along with your heart rate ticking away just below it. It’s surprisingly calming to watch, especially if you’re used to staring at static health numbers.
The scan lasts 30 seconds. If your finger is not in place correctly for this entire period, the reading may restart. When it’s done, you’ll get a result. If it says “Sinus rhythm,” your heart rhythm is within the normal range. You’ll also see your average heart rate during the test and a short explanation of what that result means.
If you felt anything unusual—like dizziness or fatigue—you can add that to the reading using a list of common symptoms. That data gets saved and can be helpful for spotting patterns over time.
For a closer look, head to the OHealth app on your phone. It stores each ECG scan and lets you swipe through the full waveform. The presentation is clean and clear, so even if you’re not a health expert, you’ll still understand what you’re seeing.
It’s a simple feature, but nicely done. Just you, your watch, a finger on the button, and a moment of stillness. No wires, no prep, and no guesswork.
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