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MusicBrainz vs Rules of Acquisition

Same instrument, two spec sheets — measured, not claimed.

APIMusicBrainzNEW—Rules of AcquisitionNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCore data CC0; some supplementary data CC BY-NC-SA 3.0Unverified
Free tierFree — no key requiredFree — limits not published
Rate limit~1 request/second per IP; descriptive User-Agent requiredUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MusicBrainz vs Rules of Acquisition: common questions

Which is more reliable, MusicBrainz or Rules of Acquisition?

On our scheduled checks, Rules of Acquisition leads on measured uptime — MusicBrainz at —% versus Rules of Acquisition at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do MusicBrainz and Rules of Acquisition need an API key?

Neither needs a paid key — MusicBrainz is callable with no signup, and Rules of Acquisition is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call MusicBrainz and Rules of Acquisition from the browser?

Yes — both MusicBrainz and Rules of Acquisition send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are MusicBrainz and Rules of Acquisition free for commercial use?

MusicBrainz allows commercial use on its free tier, and Rules of Acquisition has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.