What are Leaflet and Mapbox, and what are their differences?
What are Leaflet and Mapbox, and what are the differences or usages of both? What are the main differences in their APIs?
Answer
The other answer is good but a bit outdated, since Mapbox has changed significantly in two years.
Leaflet is a JavaScript API for making maps interactive on the internet. It can integrate with Mapbox, but also plenty of other tile sources, like OpenStreetMap, and other data sources, like GeoJSON overlays.
Mapbox is a company that provides map services and technology - one of those services, Map tiles, can be used in Leaflet as base maps - same as you'd use Google Map tiles in the Google Maps API. Mapbox also develops a Leaflet plugin called Mapbox.js that makes it simple to integrate with their tiles while still using all of the great functionality in Leaflet. We also support Leaflet's development, since the maintainer works here.
You can use Mapbox.js without using Mapbox tiles, and use Leaflet with Mapbox tiles - they're entirely mix-and-matchable. Mapbox.js's additions, like TileJSON and UTFGrid support, make it easier to integrate with Mapbox maps, but don't change the existing behavior of Leaflet.