Lo-Fi with Ruka

Lo-Fi with Ruka is a quiet rainy-night study room designed to help you finish what matters, one session at a time.
Write down a goal, choose a 25, 45, or 60-minute focus session, and settle into a looping animated room with lo-fi music. Completed sessions, goals, and focus time build a calendar that helps you review your rhythm over time.
Focus and music
25, 45, and 60-minute focus presets
50 built-in lo-fi tracks with non-repeating shuffle
Local MP3, OGG, and WAV music import
Playlists, favorites, previous-track control, fades, and normalized loudness
Immersive mode and fullscreen controls
Optional companionship from Ruka
AI companionship is text-first. With your own DeepSeek API key, Ruka can reply to short messages and continue a personal study-room story connected to your progress. With your own StepFun API key, generated replies can be read aloud. Both services are optional, and their keys remain on your device.
Ruka keeps only a bounded memory of recent goals, completion outcomes, and selected non-sensitive preferences. You can clear this companion memory at any time without deleting your focus calendar.
Quiet Steam companionship
When Steam is available, focus progress can sync through Steam Cloud. You can see friends who are focusing, exchange preset notes, and invite up to eight participants into a friends-only group for a synchronized 25-minute session. There is no real-time chat.
Native support is included for Windows 64-bit, Intel Mac, and Apple silicon Mac.