[EDIT: 19 April 2026 … There is a split project named CoMaps that is a community fork from Organic Maps with very similar features. This split project was created due to community concerns about Organic Maps ownership and possible direction. Please see my April 19 post below for more info.]
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Good tip, David.
I previously tried OsmAnd as well, but found it a bit sluggish and clunky, especially on older hardware. I settled on Organic Maps, which also uses OSM map data. First released in mid-2021, it is very light, fast, and best of all does not have a pay-wall block on select features (but donations are welcome). The dev team continue to update, improve and add free features such as topo lines. They also do not track user data and seem dedicated to privacy, from what I can tell. It allows import/export of map pins (ie. locations) such as from OsmAnd. It does fairly well at routing, but you do need to evaluate the path like any of these GPS apps.
Organic Maps, OsmAnd or any other OSM app (or offline GPS app) permit you to see WHERE you are even with no cell/wifi signal in Airplane Mode. You can be in the middle of the desert and see where you are based on GPS triangulation. On commercial flights, if you place your offline phone/tablet against the window, it will shortly catch the GPS pings and you can track your location (and identify a nearby mountain). Many of these apps are starting to offer the option to integrate Google map info/markers and other data if you choose.
You start with a basic map of the world that has major land masses, major highways and cities, but as you zoom in, you cannot see any detail. This is where you must download regions in advance. So any OSM app will take space on your device. Each region map includes the base road/map data taken from other known sources, and the community and moderators add details depending on how may people have contributed. This means, in some places there are numeric addresses, shapes representing buildings and markers for businesses and points of interest, but in other places there may be only the roads and major features (like an old Garmin device).
I sometimes make the analogy that OSM is a sort of wikipedia for maps, but that is not entirely accurate. OSM is much more popular in Europe and other locations around the world. You do not need an OSM account to use these apps, but it can be fun to update features in your region if you find something missing or inaccurate.
Often the mountains and major natural features are marked as well as local trails. This is not always the case, so scan any region before you go to verify you have the details you need. Adding map pins with info is simple and can be useful once your are out and about.
If you need to reclaim space, just delete selected maps, while retaining your map pins and text notations. They will remain at their coordinates for reference or if you re-download a region.
OSM-based map apps are not the same experience as Apple or Google maps, to be sure, but they offer a cloud-free experience and crucial tool for off-grid GPS activity, not to mention personal safety.
A couple minor complaints I have with Organic Maps: App was changed to auto-snap to your current location (like Apple Maps does) if you leave it open for a while and come back. (This may have been corrected/reverted in a recent update.) App does not have a way to activate Light and Dark modes automatically based on time of day or ambient light. As a workaround, I just keep it on “Auto” appearance and use the Control Center toggle to engage Dark mode when using the app at night.
[Edit: Fixed typo and some language for clarification, plus ‘complaints’ at end.]
[Edit 2: Added CoMaps note at top with link to April 19 post, also added note about ‘complaint’ #1]