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BullWatt

Bullwatt is a free, open-source, browser-based indoor cycling tool for cyclists

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What BullWatt does

Bullwatt is a free, open-source, browser-based indoor cycling tool for cyclists who just want to control a smart trainer by target watts without a subscription, account, or virtual world.

What users say 1

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Zain Sheikh
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Zain Sheikh

Aug 16, 2026

Target-watt control for a smart trainer with no account and no virtual world is exactly the gap most indoor cycling apps leave open, and open source makes it easy to trust. Which trainer protocols does it support?

canssens-26e2's avatar
canssens-26e2Maker

Hello Zain,

thank you for your review;

you described exactly what we try to do.

For you information the current list of devices tested:

https://www.bullwatt.com/articles/compatible-hardware.html

-Domyos Challenge Bike

-Zwift Hub

-SUITO

-Saris

-Wahoo KICKR CORE

-Xpedo APX Pro

-Elite Direto XR

-Van Rysel home trainer

but globally all FTMS indoor bike trainer with ERG mode are compatible.

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Questions about BullWatt

BullWatt is a personal life product listed on Uneed, available for free. It's tagged with Sports, Open Source. See the best Sports products for related options.

What is BullWatt?

Bullwatt is a free, open-source, browser-based indoor cycling tool for cyclists.

Is BullWatt free?

Yes, BullWatt is free to use.

What are alternatives to BullWatt?

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What category does BullWatt belong to?

BullWatt is listed under Personal Life on Uneed.

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