Merging data from HealthFit and Wahoo

Hi
I upload activities from Strava, Wahoo, and HealthFit. The latter is synced with my Apple Watch. I usually record my rides with my Wahoo and my Apple watch. Right now they upload twice on Interval.icu. Is there a way to merge the data? I have my HR on my Apple watch and the power meter that is synced to my wahoo. I’d love to see all data merged into a single activity on interval.icu.

Intervals can’t do this. It is far more difficult to do then what you probably think. Appending 2 files from different devices can be done for free on fitfiletools.com. Merging data-streams require a complete recalculation of the data.
I do use Combining Strava GPS (TCX|GPX|FIT) files, exporting GPX files from Garmin Connect, and adding time stamps to GPX files - GOTOES free utilities for this kind of merging. If you want to export as a FIT file, you will need to make a one-time donation.

Alternative is to broadcast the HR form the AW and have Wahoo record that one, too.
I’d successfully used heartcast for a few times.

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@yokuha 's solution should be the way to go. Then you don’t have manipulate anything afterwards because all data will be in the Wahoo FIT file.

HeartCast needs to be running on the phone for that to work. It’s essentially AW (HeartCast App) → HeartCast (phone app) → Wahoo

This is unlike the Garmin’s Broadcast HR feature where a middleman is not needed.

Also, i think it’s likely the OP is using the native Apple Watch Workout App to record stuffs and I think it’s not possibl to be running HeartCast (app) together w/ the Apple Watch workout app simultaneously. (I don’t have an Apple Watch so I’m speculating)

AW w/ the new firmware supposedly supports Power Meter, so you can connet your power meter to the Apple Watch as well and use that?

But that would not be necessary anymore (if he has HR in the Wahoo).

That’s correct and works well – I use that for commutes. But the AW does not record L/R balance…

Thank you all. So let me get this straight: I need the app HeartCast on my phone that records my HR and I need to sync it with the Wahoo. that way I can register with the wahoo and, of course, have all data in a single fit, which is preferable. correct?

Essentially yes.
IIRC there are multiple apps that you could use, but HeartCast is one. Then you can connect this as a HR-monitor in your Wahoo device and at the end of the ride you get one file with all data.