PotterDB vs Random Useless Facts

PotterDB is a free, keyless database of the Harry Potter universe covering books, chapters, characters, movies, potions, and spells, reachable through both a JSON:API-style REST interface (api.potterdb.com) and a GraphQL endpoint. Every resource supports filtering, sorting, sparse fieldsets, and pagination in the JSON:API convention, and the REST side publishes a live OpenAPI schema. It's a community-run, open-source project welcoming Hacktoberfest contributions rather than a commercial offering.

Random Useless Facts is a free, keyless API that returns one trivia snippet at a time — random, "fact of the day", or lookup by ID — each with its own permalink and a source URL crediting the site it was pulled from (largely djtech.net). Responses come back as JSON by default, but requesting with an `Accept: text/plain` header returns the same fact formatted as plain Markdown-style text instead. There's no rate limiting, authentication, or paid tier — it's a small side project by its Polish maintainer.