adresse.data.gouv.fr vs ipapi.co

The Base Adresse Nationale's API Adresse geocodes and reverse-geocodes French addresses for free with no API key, backed by Etalab and IGN's data.geopf.fr infrastructure (the older api-adresse.data.gouv.fr host still answers directly and does not redirect). Requests and responses use the GeoJSON FeatureCollection format, with each result scored for match confidence and enriched with INSEE city codes, postcodes, and population. A live Origin-header probe confirms open CORS (Access-Control-Allow-Origin: *), so it works directly from browser JavaScript with no proxy.

ipapi.co geolocates an IP address and returns the result as JSON, XML, or YAML without requiring an API key for light use, though the no-key path is rate-limited and marketed by the vendor as a free trial rather than a permanent free tier. Paid subscriptions start at $15/month (or $12/month billed annually) for 60,000 lookups/month, scaling up to $399/month for 15 million/month.