COROS GPX analyzer. Upload a GPX from COROS to see elevation gain, loss, grade %, and route difficulty on an interactive map.
Export GPX from COROS and analyze elevation/grades so you know where the course gets hard.
Every page on this site has a Markdown mirror at the same path with a .md suffix (for example /calculator.md), and honors an Accept: text/markdown request header on the HTML URL. The calculations here are also available as callable tools through a free public MCP server — no account or API key.