BIFROST

BIFROST is an adaptive soundscape app for deep work, study, and short resets. It combines layered ambience and music, focus timers, and a visible live audio signal so people can build a repeatable environment for focused work. New users receive 5 days of FULL ACCESS with no card and no automatic charge, then can continue on a free tier with core presets and basic environment mixing. Optional full access is $9.99 per month. Built by independent developer Inui in Japan; BIFROST is a productivity and listening tool, not a medical treatment or hearing test.