mySugr from mySugr GmbH records health and activity data on Android.
Features of mySugr
Records stay on the device unless you connect an account.
Build details
This build is version 3.155.0 Build 805464, the download runs to about 94MB, and it needs Android 11 and up.
The change in this release is listed as Pro Unlocked. Check the file against the scan result on this page before you install it.
Installing
Allow installs from unknown sources for whichever browser or file manager you used, open the downloaded file, and confirm the prompt. If an older copy is present and its signature differs, uninstall that first.