Intervals.icu vs Trainingpeaks premium?

I’ve used ICU for a couple years now. Love it and does the same things I would use TP for but I don’t have to pay for it.

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Another feature I’ve just found that I’ve been after on TP forever…

I can compare arbitrary intervals against an arbitrary metric across time. EG, here is a chart of intervals at 75% threshold-pace, on outdoor runs, since 16 September, that shows pace-efficiency as yards per beat. I defined the custom metric using JavaScript. Then then told ICU (using Compare Activities) to select only intervals from 65-75% threshold-pace, since 16 September that were outside, and I get this chart:

I just discovered another feature, probably old hat for most of you, in that I can set a different indoor FTP vs outdoor. That’s pretty valuable to me, since I’m using a pretty basic smart trainer (Tacx Flow) that I know reads about 15-20watts lower than my Quarq. Up until now, I’ve been using the quarq as the power source, but I really don’t want to have that bike tied to the trainer, I’d like to be able to use one of my other bikes as a dedicated trainer bike.

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Compare activities is awesome feature. very helpful to see differences between different power meters and trainer, GPS accuracy, etc. Helps make sure you have consistency in your equipment.