SecondMonitor

Open-source live timing and telemetry companion for lap comparison across several sims.

Telemetry & DataOverlays & Dashboards Free Active

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Active

Development status

Latest release 9.39.1, 2026-08-01. Source

Status checked automatically against the project repository at this build.

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Overview

SecondMonitor is a free, open-source companion app that shows live timing, standings, and telemetry for lap comparison across iRacing, Assetto Corsa, rFactor 2, Automobilista 2, Le Mans Ultimate, and a few other titles. It has been a popular pick in the open-source overlay space for years.

Development moved from the original GitHub repository to GitLab, where releases continue: version 9.39.0 (April 2026) added Le Mans Ultimate shared-memory support, virtual energy data, and ABS/TC info. The old GitHub repository still exists but only as a pointer to the GitLab home.

With SimLauncher: Listed as a companion-app pill on the SimLauncher homepage (as "Second Monitor").

At a glance

Supported sims	iRacing Assetto Corsa rFactor 2 AMS2 Le Mans Ultimate
Pricing	Free
License	Open source
Platform	Windows
Website	gitlab.com/winzarten/SecondMonitor
GitLab	gitlab.com/winzarten/SecondMonitor

About SecondMonitor

SecondMonitor is an open-source companion overlay for sim racers who want more timing and telemetry information than their sim shows natively. It runs alongside iRacing, Assetto Corsa, rFactor 2, Automobilista 2 or Le Mans Ultimate and pulls data straight from each game's shared memory, so there's no manual export step: live timing, standings and car data update in real time while you drive or spectate.

Because the project is developed on GitLab under the MIT license, anyone can inspect the source, report a bug or submit a fix rather than waiting on a closed vendor roadmap. Development has stayed active for years, which matters for a tool that has to track shared-memory formats every time a supported sim ships an update.

Version 9.39.0 added shared-memory support for Le Mans Ultimate along with virtual energy data and ABS/TC readouts, extending SecondMonitor's lap comparison tools to LMU's hybrid and energy-management systems. That per-sim tracking is the main draw for endurance and multi-class racers who move between titles and want one consistent timing tower and lap-delta view instead of relearning each game's built-in overlay.