Transportation · head-to-head
Transport for Denver, US vs Transport for Paris, France
RTD Denver's original gtfs-developer-guide.shtml page is gone after a full site rebuild (now 404s); the transit agency's open-data offering now lives under open-records/open-spatial-information, split into static GTFS zip downloads (bus, light rail, commuter rail, plus the regional Bustang service) and three GTFS-Realtime protocol-buffer feeds (vehicle positions, trip updates, alerts). No API key is required, only acceptance of a redistribution license agreement.
RATP's own open-data catalog (separate from the region-wide Île-de-France Mobilités PRIM portal), an Opendatasoft-hosted Explore API. Its 26 datasets cover per-station air quality readings, annual station entry-traffic counts, and points of interest such as defibrillators, water fountains, public toilets, and licensed nearby shops for the Paris metro, RER, tram, and bus network. No accessibility or network-reference dataset is published. Public dataset reads work anonymously with no key over the v2.1 Explore API.
| Transport for Denver, US | Transport for Paris, France | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | free |
| Formats | GTFS, GTFS-RT | JSON, CSV, GeoJSON |
| CORS | no | yes |
| HTTPS | Yes | Yes |
Transport for Paris, France supports CORS, while Transport for Denver, US doesn't — pick Transport for Paris, France for direct browser calls.