A note on OrganicMaps: at present you are better off using the fork CoMaps. OrganicMaps is tainted by governance issues and a lack of financial transparency:
A note on this reactionary stance: at present you are better off using OrganicMaps. CoMaps is tainted by being a reactionary fork, has less features and lags behind on bug fixes.
I've found CoMaps actually has more features, like I was able to submit a new Place to OSM which wasn't possible in Organic Maps at the time I switched over. This discrepancy may not still be the case though as I haven't checked recently.