Howli turns one voice into a polished harmony video. Choose a song, hear your part, then follow pitch and lyric cues while you record. Build each harmony layer one at a time, keep your best takes, and watch the full stack come together on your iPhone. Perfect for singers who want to practice harmonies, learn vocal parts, make covers, and turn one voice into a full choir-style video. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/