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As far as I know, there isn't anything like that. Map making tools are already a pretty niche thing, and wanting one that is both free and made for mobile... I doubt you'll find anything. The closest I could find is azgaar's map generator, it's supposed to be a map generator, but you can just ignore that aspect, erase everything and draw your own map. It's free, online, and works on mobile browsers.
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Hence, a higher number means a more popular project.