Combine multiple activities together for more data points

The feature probably exists, but I haven’t found it yet. How is it possible to combine multiple activities to see a heatmap of L/R power balance or Power / Heartrate Heatmap for example ?

Thanks!

gotoes.org is generally the recommendation for this sort of thing. intervals.icu does not have a method of combining the streams from multiple files over top of each other.

Not looking to combine multiple data streams from different devices. I’m looking to combine the same devices from multiple activities. For examples heart rate data from the last month and compare it to last year.

I don’t think you can create Heatmaps at this time, but you can use the Compare page to evaluate time periods against each other.