Check out Dawarich, it has an official iOS app and you can use a number of 3rd party mobile apps to track your data and then upload it to server: either ran on

Check out Dawarich, it has an official iOS app and you can use a number of 3rd party mobile apps to track your data and then upload it to server: either ran on your own hardware (FOSS self-hosted) or to the Dawarich Cloud one: https://dawarich.app https://dawarich.app Using it on daily basis