Hello @lhdamiani
Thanks for posting about this, and we're happy to hear you're using our Fitness and Freshness features. When comparing your Fitness on the Mobile App vs. your Fitness on the Web, it's important to make sure the same parameters are selected.
On Mobile and Web, you can select the time period you want to view, so it's important to make sure you are comparing the same time periods. From your screenshots I can see you've selected 3 months for Mobile and 3 months for Web, so that's good.
The Mobile view of Fitness takes all activity types into consideration, however on the web you can filter and look at your Fitness score considering only particular activity types. I can see that your Web view is set to "all activities" so again, that's good.
When we calculate Fitness, we use relative effort and any power data you record on your activities. In the Mobile view, we show your fitness score based on both of these. However on Web, you can select to view your Fitness by either relative effort only, power only, or both relative effort and power. Looking at your screenshot, I can see you have "relative effort" selected for web, which is very likely what is causing the discrepancy. I recommend changing that to from "relative effort" to "power and relative effort" and your fitness score on web should then match what you see on Mobile.

Apologies for any confusion over this. Please give that a try and let us know if that solves the problem.