FreqBlog provides a music-metadata API that returns detailed audio features (BPM, key, mood, energy, genre, ISRC and more) for tracks. You can look up tracks by artist+title, ISRC, or upload audio for analysis and also resolve up to 50 tracks in a single bulk request.
What can you use it for?
Build a DJ set builder that matches songs by BPM and key, tag playlists with mood and energy, or enrich catalogs for recommendations. You can query by artist+title (no Spotify ID needed), upload audio for analysis, or resolve many tracks in one bulk call. There’s a forever-free tier for experimenting and instant paid upgrades for production. Results include BPM, key, mood, genre and ISRC so you can ship features fast.
API Stats
Health ▼
95
A score out of 100 from our daily tests over the last 30 days, based on error rate, reliability and speed.
Reliability ▼
100%
Share of our daily test calls in the last 30 days that succeeded, averaged over all endpoints of this API.
Error rate ▼
0%
Share of our daily test calls in the last 30 days that failed, averaged over all endpoints of this API.
Yes — you request a key (free keys are emailed instantly) and include it for full access; the site offers a free key with no card required.
Yes — a forever-free tier gives 1,000 requests/month, 50 requests/minute for upload endpoints and limited concurrency; monthly quota resets on the 1st.
No Spotify IDs required — you can search by artist+track name, ISRC, MusicBrainz ID, or Spotify ID, and missing tracks are backfilled on demand.
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