A free smart trainer app
Your smart trainer, straight from the browser
Pair an FTMS smart trainer from Chrome or Edge and ride structured workouts in ERG mode — alone, or with your crew in a voice channel. No install, no subscription, and your heart-rate strap and power meter pair the same way.
What pairs
Trainer, heart rate, power, cadence
Smart trainers (FTMS)
Any trainer that speaks Bluetooth FTMS, which most current smart trainers do. ERG mode holds your watts; a sprint or a free ride switches it to a grade you push against.
Heart-rate straps
Any Bluetooth heart-rate strap or armband. Your heart rate shows on your tile and in your ride.
Power meters and cadence sensors
Pedals, cranks and hub sensors over Bluetooth, when you would rather trust your own power than the trainer’s.
Where it runs
Chrome or Edge, on a laptop or an Android phone
Web Bluetooth is what lets a web page reach your trainer, and not every browser has it. Here is exactly where WattRoom can ride.
- Chrome or Edge on Windows Full: trainer, sensors, voice.
- Chrome or Edge on macOS Full: trainer, sensors, voice.
- Chrome on Android Full, on a phone or a tablet.
- The desktop app macOS, Windows and Linux; its own window, and a floating HUD.
- Chrome on a Chromebook Chrome ships Web Bluetooth there; tell us how your trainer does.
- Chrome on Linux Web Bluetooth is still behind a flag in Chrome on Linux.
- iPhone and iPad No browser on iOS can reach a trainer. Join the crew and the call; ride from a laptop.
- Firefox and Safari Neither implements Web Bluetooth.
Questions
+Do I have to install anything?
No. Chrome and Edge talk to Bluetooth devices themselves (Web Bluetooth), so you open the page, click Pair, and pick your trainer. A desktop app exists if you prefer a window of its own.
+Does my trainer work?
If other apps control it over Bluetooth FTMS, very likely. Older Wahoo KICKRs that predate FTMS use Wahoo’s own protocol, which WattRoom does not speak yet. ANT+ is not supported in the browser.
+What is ERG mode?
The trainer sets the resistance so you ride at a given wattage, whatever your cadence. A workout’s target becomes the trainer’s job, and yours is to keep pedalling.
+What if my cadence collapses in ERG?
WattRoom watches for the spiral — cadence falling while ERG raises resistance to hold the watts — and releases the target for a moment so you can spin back up.
+Can my phone be a second screen?
Yes. Open the crew on your phone and it follows the session — everyone’s numbers, the chat and the voice channel — while the laptop runs the trainer.
Pair it and ride.
Start a crew, send its six-character code, and ride your first workout together tonight. Free, no install.