Plain Swift, Apus unicolor, is a species of swift found in unvegetated or sparsely vegetated land ecosystems. It breeds only in Europe on Canary Islands and Madeira. The species uses sea cliffs and is never found very far from the sea. It occurs over all habitats in Canaries from sea-level to 2,500 m; especially common in deep coastal gulleys. On Madeira it occurs from sea-level to the highest summit, Pico Ruivo, breeding on rocky islets (European Red List 2015).

Apus unicolor is endemic to Madeira and the Canary Islands and has a breeding population size of 7500-20000 pairs and a breeding range size of 11800 square kilometres in the EU27. The breeding population trend in the EU27 is Unknown in the short term and Uncertain in the long term.

The EU population status for Apus unicolor is Unknown, as the data reported were not sufficient to assess the population status of the species.