RevCarData vs Smartcar

RevCarData is a global Year-Make-Model-Trim vehicle database covering EU, US, and Asian markets, exposing 38 structured spec fields — MSRP, powertrain, dimensions, and EV/battery metrics — via a REST API and CSV export. A live GET against its real API host, api.revcardata.com/api/v1/vehicles, returned a 401 "Missing X-API-Key header" error carrying access-control-allow-origin echoing the request Origin — reconfirming auth "API Key" and cors "yes" — over HTTPS. Its site offers a free sign-up-and-get-a-key tier alongside paid plans for higher volume — freemium.

Smartcar's Vehicle API lets apps lock/unlock vehicles and read odometer, location, and other telematics data from most late-model cars through a single OAuth2 integration across dozens of automaker backends. A live unauthenticated GET and OPTIONS preflight against api.smartcar.com/v2.0/vehicles both returned no Access-Control-Allow-Origin header — resolving the stored "yes" cors to "no", consistent with Smartcar's own docs, which say API calls must be made from a backend, never a browser; auth "OAuth" and https were reconfirmed via a 401 AUTHENTICATION error. Its pricing page offers a Free plan (1 connected vehicle, no credit card) alongside paid Growth/Enterprise tiers — freemium.