My phone app says my fitness is 63; my PC says it's 56. I not as interested in the absolute numbers (just the trends), I'm just surprised they don't match.
On my PC the data goes back to Jan 2016 but the phone only displays back two years. Even at two years ago, the fitness numbers are different. In 2016, I was simply riding and had no power meter or smart trainer. Starting in Nov 2017, I had a smart trainer and in May this year I bought power meters. I've been using a HRM the entire time.
I do understand the smart trainer and power meters will make a difference - measuring real power output vs. estimated numbers. But shouldn't this all be consistent across the two platforms?