If you do not have one of the many watches compatible with Stryd, you can still run with power using Stryd.
Some watches allow the use of a footpod to measure distance and pace (for example, Garmin Forerunner 220). Check if your watch supports foot pods or power meters using ANT+ technology. You will not be able to see your power level in real time, but your power is recorded, and you can analyze your performance after your run (you will need to use your phone to sync your data after your run).
Even if you do not have a watch with ANT+ technology, you can still use Stryd. Stryd will record your run data, and you can sync your data to Stryd PowerCenter with your phone (Android/IOS). Alternatively, you can also use the Stryd app on your phone to record your run; this will allow you to capture your map and see your power while running on your phone.
A single Stryd Pod will record your run data independently of your watch, and you can access that data after any run by syncing your Stryd to the mobile app. Stryd Duo does not record automatically the same way the Stryd single pod does once you start running. Stryd Duo requires being paired to a watch or the mobile app in order to record offline data.
So, if you have a non-compatible watch and want to use Stryd, I suggest you use the Stryd single pod and not the Stryd Duo. However, if you have a Stryd-compatible watch, the Stryd Duo is a great option!