Quoting their github page

• Clears private data on close
• Blocks access to Google trackers and other third-party resources
• Restricts all network requests to HTTPS
• Allows toggling of location permission

I contribute regularly with Street Complete

CoMaps is good if you already know where to go.
I use it in conjunction with GMapsWV: look for a place, copy the coordinates with the share button and paste them into CoMaps.
Never missed an address and I use it quite a bit.