Monkey Face Software LLC

Monkey Face Software LLC www.monkeyfacesoftware.com/

About Monkey Face Software

Monkey Face Software was founded in 2018 by Tim McArthur to do one thing: build sim racing tools that teach you how a race car actually works. Three decades at the intersection of motorsport and software put me in a useful spot. I've written more than 30 third-party apps for racing sims going back to NASCAR Racing and Grand Prix Legends. I co-founded Race2Play, one of the largest online racing communities of its era. I've spent years tutoring drivers one-on-one in real-world and sim racing setup. To date, the tools I've built have helped more than 10,000 drivers understand what's actually happening under their car.

Our philosophy is straightforward. There are no shortcuts to a fast race car — only a faster driver who understands how the car responds. Every product we make is designed to develop the driver, not just hand them a pre-baked setup to copy.

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Current Lineup

onRails — Setup Creation and Engineering Suite

Our flagship app. A transparent overlay that runs on top of your sim, combining a guided setup builder and a lap-by-lap setup engineer in one package. Six car types, two track types, six supported simulators, four languages. Available July 2026.

RACE CAR SETUP: THINK LIKE A RACE ENGINEER. DRIVE LIKE A PRO - eBook

A practical system for understanding and improving race car setup by Tim McArthur. Twenty years of real-world and sim racing setup knowledge in one place. Available July 2026.