Freesound vs iTunes Search

Freesound's APIv2 lets apps browse, search, and retrieve Freesound's library of user-uploaded sound clips — with content-based similarity search and audio-analysis features on top of plain metadata search — plus upload, comment, rate, and bookmark actions for authenticated users. It supports both token-based key auth and full OAuth2, defaults to JSON responses (XML and YAML are available but untested by the maintainers), and access is free for registered developers. The older APIv1 has reached end-of-life and is no longer available.

The iTunes Search API is Apple's free, keyless lookup service for the iTunes Store and Apple Books catalog — music, movies, podcasts, audiobooks, and TV shows — searchable by term or looked up directly by ID. It's throttled to roughly 20 calls per minute per Apple's own guidance, with an Enterprise Partner Feed suggested for heavier volume, and every response comes back as JSON. The docs have moved off the long-dead affiliate.itunes.apple.com host (which no longer resolves) onto Apple's Performance Partners site, but the API itself, at itunes.apple.com/search, is unchanged and live.