Web based. You can “install” the Web App, but it doesn’t seem to allow for any additional features that I can tell.

For offline modes, CoMaps and OsmAnd+ are my go to.

Cartes is probably the closest thing that I’ve found (besides Apple Maps or Bing Maps).

• You can share links with anyone, and they don’t need a particular app to open it.
• The interface will be familiar to Google maps users.
• It supports leaving reviews for locations.
• It will pull up Wikipedia information and photos if any have been uploaded to Wikimedia or Panoramax.
• It’s really good for public transit routing.
• It’s okay for planning driving routes, but for turn by turn directions you’ll want to use CoMaps (which Cartes has a link to open up the route there).