ANT+ or Bluetooth for indoor cycling: which should you use?
Updated 2026-10-23 · Setting up and getting started
Short answer
Use Bluetooth if your device has it and you are connecting one app to your kit, which covers most people. Use ANT+ when you want several things reading the same sensor at once, or when you are on a desktop and want a rock-solid connection, which needs a cheap USB dongle.
The practical difference
Bluetooth is in essentially every phone, tablet and laptop made in the last decade. Historically a sensor could only talk to one app at a time, though modern kit is often better at this. It needs no extra hardware, which is why it is most people's answer.
ANT+ was built for sport and broadcasts rather than pairing. One heart rate strap can be read by your head unit, your laptop and a second app simultaneously, with no fighting over who owns the connection. Almost nothing has it built in any more, so a computer needs a small USB dongle.
Most modern trainers and straps broadcast both at once, so this is usually a question of what your device supports rather than what your kit does.
Which to use, by situation
Phone or tablet, one app. Bluetooth. No reason to do anything else.
Laptop, one app. Bluetooth usually, as long as it holds steady.
You want your bike computer to record while an app runs. ANT+ makes this painless, because the sensor broadcasts to both.
Dropouts you cannot solve. An ANT+ dongle on a short USB extension, placed near the bike, is the standard fix.
Older kit. Some older sensors are ANT+ only.
Browser games and Web Bluetooth
Games and apps that run in a browser, including the ones on this site, use the Web Bluetooth standard. Two things follow from that:
ANT+ shouts into the room and anything in earshot can listen, so a head unit, a watch and a laptop can all read the same trainer at once. Classic Bluetooth pairs with one thing at a time, which is why your trainer "cannot be found" when it is still connected to the phone in the next room.
It works in Chrome and Edge on Windows, macOS, Linux, Android and ChromeOS.
It does not work in Safari, and Apple's restrictions mean it does not work in any browser on iPhone or iPad, including Chrome there, because those browsers all use Safari's engine underneath.
So for browser-based indoor training, a laptop, desktop, Android phone or Android tablet running Chrome is the way in. ANT+ is not available to browsers at all.
Fixing dropouts
In the order worth trying:
Move the receiver closer. Both standards are low power and a laptop on the far side of the room is a common cause.
Use a USB extension for an ANT+ dongle so it sits near the bike rather than behind a metal laptop body.
Close other apps that may have grabbed the sensor over Bluetooth.
Check batteries. A dying heart rate strap battery causes exactly the kind of intermittent dropout that looks like interference.
Reduce competing signals. A room full of Bluetooth devices, or a 2.4 GHz wifi router right next to the bike, can cause trouble.
Wet the heart rate strap contacts. Dry contacts give spiky readings that look like a connection problem.
Common questions
Can I use both at once?
Yes, and it is common: Bluetooth to a phone app and ANT+ to a head unit, from the same trainer, at the same time.
Do I need an ANT+ dongle?
Only if you want ANT+ on a computer. If Bluetooth is working reliably for you, you do not need one.
Why will my trainer not connect to my iPhone browser?
Web Bluetooth is not available in Safari or in any iOS browser, because all iOS browsers use Safari's engine. Use a native app on iOS, or use Chrome on a laptop or Android device.
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