Unfortunately Apple and Google are big rivals and their stores are unrelated, so the app doesn’t carry over to re-download.
We'd love to offer it all for free, but app development is very costly. If you prefer not to get the iOS app, please know that the website will work well for free.
Also, if you have any Trips or Favorites saved, just save (upload) them to your member account from the Android device before moving to iPhone and then you may download them on that new device.
Thanks for your support.