The race engineer in your sim cockpit.
Two purpose-built tools, one app. Build a race setup from scratch with the Setup Developer, then fine-tune it lap by lap — and even mid-race — with the Setup Engineer. Runs as a transparent overlay on top of your sim. No alt-tabbing. No spreadsheets. No downloading someone else’s setup and hoping for the best.
Coming July 2026 on Steam | Itch.io
100% money-back guarantee. If you don’t like it for any reason, contact us and we’ll sort it out.
Module 01 — Setup Developer
Build your own baseline setup, one question at a time.
Pick your car type and track. Answer simple questions about how the car feels in each setup area — springs, dampers, aero, brakes, differential. onRails offers valid changes at every step and builds a complete starting setup tailored to your car and your driving style. By the time you’re done, you know why every value is what it is.
- Step-by-step guided build across all major setup subjects
- Six car types: Sports, Touring, Open-Wheel, Stock Car, Sprint Car, Kart
- Road courses and ovals, with track-trait flags (banking, bumps, chicanes)
- Built-in lap logger with graph, best/average/delta stats
- Pause and resume mid-session — progress is always saved
- Hand the finished setup straight to the Setup Engineer to fine-tune
Module 02 — Setup Engineer
Fine-tune your setup until it’s actually fast.
You’re in the ballpark but something’s off. The car pushes through the apex, snaps loose on exit, won’t reach top speed on the back straight. The Setup Engineer takes your driver feedback and turns it into specific, actionable changes — lap by lap, corner by corner.
Lap Wizard
Log your lap time, describe the car’s overall behavior, set severity, and snap your tire temps with a hotkey. Get a ranked list of setup recommendations with clear explanations. Confirm a change, log the next stint, watch your times drop.
Corner Wizard
When one specific corner is killing you. Pick the direction, the phase (entry, apex, exit), what’s happening, and how badly. Get targeted advice that won’t unsettle the rest of your lap.
In-Race Engineer
A keyboard-only race assistant that lives in the app header. One hotkey to toggle, numpad keys to answer 2–4 quick questions while you’re driving. Get a one-line pit-call recommendation you can act on between laps.
Direct Sim Integration
onRails auto-detects your simulator and reads telemetry directly from shared memory. Press hotkey to snap tire temps. Press hotkey to capture your last lap time. They appear in the wizard instantly. Don’t see your sim below? All setup subjects can be entered manually.
- Assetto Corsa
- Assetto Corsa Competizione
- Automobilista 2
- iRacing
- Le Mans Ultimate
- Project Cars 2
- rFactor 2
Built for Your Cockpit
- Transparent overlay — sits on top of your sim, no second monitor required
- Drag any panel to where you want it; position is saved for next time
- Customizable hotkeys — keyboard and wheel/controller buttons
- Four F1-inspired accent themes: Ferrari red, Aston Martin green, Stake F1 electric green, McLaren orange
- Four languages: English, Español, Português (Brasil), Italiano — auto-detected on first launch
- Multi-monitor support — jump to any display with one click
- Adjustable font size (100% to 150%)
- Built-in spotlight tutorials for every panel
Coming July 2026 | A Monkey Face Software production.
System Requirements: Requires a 64-bit processor and operating system OS: Windows 10 64-bit Processor: x64 Memory: 1 GB RAM Graphics: DirectX 11 compatible graphics card DirectX: Version 11 Storage: 500 MB available space Additional Notes: Runs overlaying the sim, not standalone. It is a transparent overlay. The user is expected to have the sim running in borderless window
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For the beginner - Setup Developer Tool walks you through a step by step process of creating and customizing your very own personalized baseline race setup. It does so by asking simple questions about the car type, track type, and behavior of [...]
