Redash vs Trello

Redash is an open-source query and dashboard tool that lets teams connect to a data source, write a query, and visualize the results without writing frontend code. Its REST API, documented live at redash.io/help/user-guide/integrations-and-api/api, authenticates each request with a per-user API key sent as `Authorization: Key <api_key>` and lets scripts create queries, trigger refreshes, and pull dashboard results as JSON. Redash Inc.'s hosted SaaS at app.redash.io was discontinued in 2021, so the project now ships only as free, self-hosted open-source software with no vendor-run instance to point the API at.

Trello turns Kanban-style boards, lists, and cards into a scriptable project-management primitive, letting integrations create, move, and archive cards or attach webhooks that fire on board activity. Every account gets a free API key, and requests carry that key plus a short-lived member token as query parameters rather than a full OAuth redirect — a live unauthenticated call to `/1/members/me` confirms this by returning 401 'invalid key' rather than a bearer-token challenge (auth corrected OAuth -> API Key; OAuth1.0a exists only as an alternate authorization flow for third-party apps). Trello's Power-Ups marketplace and countless third-party integrations run on this same public API, available on every pricing tier including the free plan, and CORS is wide open — both the GET and an OPTIONS preflight echo `access-control-allow-origin: *`, resolving the stored 'unknown' value to yes.