Both cost nothing. They are free in completely different ways.
Monsoon Cycles, Colorado Springs · Updated August 21, 2026
MyWhoosh is genuinely free, and it is enormous: polished 3D worlds, structured workouts, the official UCI esports platform, funded from Abu Dhabi with real money behind it. If you want the full Zwift experience without the Zwift bill, MyWhoosh is the strongest answer going and we will not pretend otherwise.
Here is what we do differently. MyWhoosh is a multi-gigabyte app with an account. Gumwall Grand Prix is a browser tab: no download, no install, no account unless you want leaderboards. MyWhoosh gives you their worlds; we give you sixteen courses drawn on the real centerlines of famous circuits, and the bike you ride is one you designed yourself in the Frame Lab. They are backed by a sovereign wedge of oil money; we are backed by a one-man frame shop in Colorado Springs, which is either a point against us or the entire point, depending on your taste.
Both support smart trainers. Both estimate power from a speed sensor on a dumb trainer; ours publishes the curves it uses.
Honest recommendation: want big worlds and organized racing, use MyWhoosh. Want to click a link and be riding ten seconds later on a bike you drew, that is us. Plenty of riders should have both open in their life.