Yesterday I experimented a little bit with the scale factors: 50% 100% 200%
My Impression was that the difference could be more.
Maybe 25%-400%
Maybe 15%-200%
min zoom 13.6
max zoom 16.1
Kurviger Pro 1.14.1
Android 8.0.0 (API 26)
samsung SM-G930F
1080 x 1920 (480 dpi)
I noticed that min zoom was never reached.