A genuinely free Zwift alternative, in your browser

Gumwall Grand Prix is a free indoor cycling game that runs in a browser tab: smart trainers, dumb trainers with a speed sensor, 15 courses on real circuit shapes, live multiplayer, no download and no subscription.

Monsoon Cycles, Colorado Springs · Updated August 16, 2026

If you searched for a free Zwift alternative, here is the honest landscape as of August 16, 2026, including where we win and where we do not.

TRY IT IN THIS TAB NO SMART TRAINER?

The honest comparison

Platform	Price	Install	Dumb trainer support	Notes
Gumwall Grand Prix	Free, forever	None, browser tab	Yes, published power curves	15 courses on real circuit shapes, multiplayer, ride your own custom-designed bike
Zwift	Subscription, roughly 20 dollars a month	App, several GB	Yes (zPower)	The biggest worlds, racing scene, and workout library; the benchmark
MyWhoosh	Free	App, large download	Limited	Well funded and genuinely free, app install required
Rouvy	Subscription	App	Limited	Real-video routes rather than 3D worlds
TrainingPeaks Virtual	Paid tiers	App	Varies	The former indieVelo, now part of TrainingPeaks

What free actually means here

No subscription, no trial clock, no feature paywall, no download. The game is a single web page. It exists because Monsoon Cycles is a frame shop, not a software company: the game sells nothing but the idea that bikes are joyful, and occasionally a handmade steel frame to someone who fell in love with their virtual one.

What Zwift still does better

Honesty is the whole brand: Zwift has vastly bigger worlds, structured workout ERG libraries, organized racing at scale, and a decade of polish. If you race seriously indoors, Zwift earns its subscription. If you want to spin on a trainer in a beautiful small world, ride real famous circuit shapes, and pay nothing, that is us.

What you need

Best: a smart trainer (FTMS Bluetooth). Gradient changes the resistance, just like the big apps.
Also great: any dumb trainer plus a Bluetooth speed and cadence sensor. We estimate watts from wheel speed using published virtual power curves.
Just looking: arrow keys. Demo mode works on anything with a browser, including phones.

Questions riders actually ask

Is Gumwall Grand Prix really free?

Yes. No subscription, no trial period, no paid tier. It is a free game made by a custom bicycle frame shop in Colorado Springs.

Does it work with my smart trainer?

If your trainer speaks Bluetooth FTMS, which almost all recent smart trainers do, yes: use Chrome or Edge on a laptop, or an Android phone. iPhone Safari does not support Web Bluetooth; use demo mode or the Bluefy app there.

Can I use it with a dumb trainer?

Yes. Pair a Bluetooth speed sensor, pick your trainer's resistance curve, and the game estimates power the same way Zwift's classic zPower does.

Is there multiplayer?

Yes. Signed-in riders on the same course see each other live with names overhead, and there is world chat and per-course chat.

Like tools that respect you? The same shop builds custom steel frames by hand. Talk to Austin about building yours.