I just tried to use OpenTopoMap in Kurviger App - does not work , only light grey background.
On Kurviger.de OpenTopoMap works fine, also on gpxshaping.de - so tile server seems to work.
Does the app also use tile server (bitmap), or is it a vector map?
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Now it seems to work fine.
Like all online services, it may have been a problem on their server.
It is a bitmap map.
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Thanks for the info.
Still does not work in app on my device (not a severe problem, but would be nice to use).
Mapilion and Stamen Terrain work, but OpenTopo does not (only attribution is switched):
Websites using OpenTopoMap tile server work on this device (as described in previous post)
They may changed the server protocols / certificates
and they are no longer compatible with old Androids.
(verified on Android 5 emulator)
Or they may need to fix the server certificate signing.
As happened in the past with online search on Android < 5.
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Thanks again for the feedback!