Cat Facts vs MeowFacts

catfact.ninja is a free, keyless REST API built on Laravel that serves a curated database of cat trivia facts alongside a separate cat-breed dataset (coat, pattern, country of origin, and more). Its /fact endpoint returns one random fact, while /facts and /breeds paginate through the full ~166- and 98-page collections respectively. The API documents itself via a Swagger UI hosted at its own root and throttles unauthenticated requests to 100 per minute per IP.

meowfacts is a free, keyless REST API that returns one or more random cat facts as JSON, with count and id query parameters for multiple or specific facts. A lang parameter serves community-translated fact sets in around 15 languages (English, Spanish, French, German, Korean, Russian, and others, by browser-style ISO 639 code). It's an open-source (GPL) side project hosted on a free Heroku dyno and documented via SwaggerHub, with no signup, key, or pricing tier.