I tried Felt and it looked good. However for me the marker / polygon moved significantly with different zoom levels which is a fairly big issue. This was in 54,-1 area (lat/lng) - I don't know if it could be as simple as different coordinate systems on markers vs mapping?
(Felt engineer here) That does sounds like a big issue! Are you able to reproduce the marker or polygon moving based on zoom levels? I tried for a bit and I wasn't able to reproduce this. How are you changing the map zoom?
I tried Felt and it looked good. However for me the marker / polygon moved significantly with different zoom levels which is a fairly big issue. This was in 54,-1 area (lat/lng) - I don't know if it could be as simple as different coordinate systems on markers vs mapping?