This. I use TrainingPeaks with Intervals as well as Strava - well, and Garmin Connect and Zwift and ...
Intervals - as well as TP, TR, Zwift, Garmin Connect, and Strava, are pretty lightweight on the free side (let's face it, you get a lot for free) and they are all integrated to some extent (push/pull varies by app).
I also advocate for supporting David (Intervals) with a $12 every 3-month commitment. It's an incredible resource.
Intervals - as well as TP, TR, Zwift, Garmin Connect, and Strava, are pretty lightweight on the free side (let's face it, you get a lot for free) and they are all integrated to some extent (push/pull varies by app).
I also advocate for supporting David (Intervals) with a $12 every 3-month commitment. It's an incredible resource.