Google Analytics vs Redash

The Google Analytics 4 Data API (`analyticsdata.googleapis.com/v1beta`) lets applications pull custom reports of metrics, dimensions, and audience segments out of a GA4 property, complementing a separate Admin API used to manage properties, streams, and access. It requires a Google OAuth 2.0 bearer token, confirmed live via a `WWW-Authenticate: Bearer realm="https://accounts.google.com/"` challenge on an unauthenticated `runReport` call, and the same request repeated with an Origin header echoed `access-control-allow-origin` back, resolving CORS support from unknown to yes. The core Data API is free to call within Google's standard quotas, with Google Analytics 360 offered as a paid enterprise tier for higher limits and additional features.

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.