In a similar MyFitnessPal alternative vein, I've been using FoodNoms[1] for a food diary for a while. It's focused on only that, which I appreciate compared to these "literally everything smooshed into one app" takes.
[1]: https://foodnoms.com
[1]: https://foodnoms.com
Been using FatSecret[0] myself on and off for the past few years. Name is terrible, and over time it's slowly been becoming more of a featurespam bilkfest, but for the time being it's still perfectly usable without handing over a subscription fee or whatever.
[0]: https://play.google.com/store/apps/details?id=com.fatsecret....
The app is truly a labor of love and it means a lot when I hear others are getting value out of it. If you or anyone has any feedback regarding the app, I'd greatly appreciate it.