Echoir (from Echo + Choir) is a sophisticated Material You music downloader for Android, delivering high-quality audio formats while adhering to Material Design principles. The name cleverly plays on the phrase "which will fall soon," reflecting the ephemeral nature of software projects.

• Material You Theming — Dynamic colors following system preferences
• Material Design 3 — Modern components and animations
• Intuitive Interface — Simple workflow for downloading music

• Background Processing — Downloads continue with progress notifications
• Comprehensive Metadata — Extensive tag support for all major fields
• Queue Management — Organize and prioritize downloads
• Customization Options:
  • Configurable download locations
  • Flexible file naming formats
  • Smart filtering system

• Quality Filters: Hi-Res, Lossless, Dolby Atmos
• Content Filters: Explicit, Clean

Echoir embeds rich metadata in every download:

Echoir represents a complete reimagining of its predecessor (FluidAC) with significant improvements:

• Optimized Codebase — Dramatically reduced APK size
• Enhanced Functionality — Background downloads and comprehensive metadata
• Open Source — Fully transparent development
• Minimal Dependencies — Custom-built minimal version of ffmpeg-kit

Echoir utilizes a custom-built version of ffmpeg-kit specifically for Hi-Res Lossless content processing:

• Handles MPEG-DASH Segments — Hi-Res content is delivered as segmented files
• Stream Copy Only — Uses -c copy flag for lossless concatenation without re-encoding
• Format-Specific Processing — Only used for Hi-Res content; other formats download directly

• Missing Lyrics? Try SongSync for managing and syncing lyrics

• Design:
  • App launcher icon and banner by Xelxen
  • UI design improvements based on Figma mockups by HotarunIchijou
• Core Technology: ffmpeg-kit by Arthenica (custom minimal build)