If you just want to add POI data, then Every Door is a good choice that also works on iOS CoMaps would be a good map app, and it will also display when POIs an

If you just want to add POI data, then Every Door is a good choice that also works on iOS CoMaps would be a good map app, and it will also display when POIs and opening hours were last confirmed (the only OSM app to do so AFAIK) https://every-door.app https://every-door.app https://www.comaps.app https://www.comaps.app