Introducing Genius Plus; the next-gen music companion that intelligently analyzes your music library on-device and builds cohesive flowing playlists and radio stations, all while keeping your data private.
Features:
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Library import & caching
Imports local Apple Music/iTunes library
Extracts metadata (title, artist, album, genre, duration) and optional ID3 BPM/key
Resolves local playable URLs when available
Persists the imported library to Application Support as JSON (fast startup)
Automatic invalidation and refresh
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On device audio analysis
BPM detection with beat time estimation
Chroma and musical key detection using Krumhansl profiles
Spectral centroid and RMS energy computation
Beat synchronous chroma aggregation (multi window averaging per beat)
L2 normalized 14 D vectors (12 chroma + centroid + RMS)
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Feature engineering
Per dimension weighting for chroma, BPM/centroid, RMS, and optional metadata
Configurable multi window averaging for centroid/RMS
Optional metadata embedding (artist/genre hash, BPM/duration normalization) with re normalization
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Vector optimization
L2 normalization for all vectors
Optional PCA (mock first components slicing, configurable target dimension)
Optional quantization (4 8 bits) persisted alongside doubles
Dequantization at query for memory efficient similarity
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Similarity & indexing
Weighted cosine similarity for in memory comparisons
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HNSW style ANN index with:
Configurable max neighbors per node, max levels
Multiple entry points for robust search starts
Priority queue bottom layer search
JSON persistence with versioning
Lazy disk similarity index (keys only) with on demand vector loading
Incremental disk ANN for scalable approximate search (JSON with versioning)
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Resilience & performance
Retry wrappers for feature extraction
Cancellable batch processing with concurrency and rate limiting
Atomic, thread safe cache writes; expiry and cleanup
Progress reporting during analysis
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UI & UX
Library browser with filtering (artist/genre/BPM/key)
Track details show BPM, key, genre, and derived features
One tap Genius playlist from any track
Genius Plus Radio: continuous play seeded from any track
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Settings screen with live bindings to analysis/similarity behavior
Automatic settings sync
Manual "Apply Settings" button with change tracking (disabled when no changes detected)
Visual confirmation alert when settings are applied
All settings sync in real-time as you adjust them
Premium gating: Analyze, Genius playlist, and Radio require active trial or purchase; non premium prompts paywall
On-boarding is not dismissed until continuing or starting the free trial (prevents bypassing trial)
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Background & widgets
Background audio playback configured
Live Activity (Lock Screen / Dynamic Island) shows title/artist/progress and status
Home Screen widget displays Now Playing from App Group and deep links to resume
Deep link resumes playback and navigates to Radio
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Privacy
Swytchcode
Super awesome. Congrats on the launch!