Zapp Chess

Zapp Chess is basically chess made for those moments when you have just a few minutes to spare. Instead of playing a full game, you jump straight into the middlegame and finish a match in around 3 minutes. You're still playing real people and making real chess decisions, just without spending time on long openings and endgames. The app is free on Android and iOS, and after you play, there are online analysis tools that help you understand your mistakes and better moves. It's a really easy way to play and improve at chess without needing a lot of time.