Hi! MapComplete dev here!

One of the major differences is that, in StreetComplete, an object is hidden from the view once all quests are done. That makes StreetComplete a 'contribution-only' tool. (This changed in recent years, where Westnordost created 'overlays'). StreetComplete was a major inspiration though.

In MapComplete, you will see _all_ objects (known in OSM) for a specific topic, wether or not there are unresolved questions. That makes it a tool for both using the data and contributing.

Another difference is that MapComplete started as a webapp (but there is a version packaged as Android app too); whereas StreetComplete is (for now) an Android-only app (iOS is in the works)

A more abstract difference is that MapComplete has some highly specialized questions.

At last, MapComplete has some integrations with other FLOSS-tools, such as: - Wikidata/Wikipedia for additional pictures and articles - Mangrove.reviews for reviews - Panoramax to add pictures - Mapilarry to link pictures to objects - Plantnet to determine the tree species on https://mapcomplete.org/trees