Redline is a video game for Mac OS X developed by Jonas Echterhoff and published by Ambrosia Software.

The game's primary features are its ability to simulate actual racing physics, online play, and support for the addition of third party content via plug-ins.

Redline also has several modes of gameplay for those who prefer arcade style physics commonly found in other racing games.

Strict is a derivative of the Simulation mode, that was added in a later update that adjusts how car-scenery collisions are handled to help reduce the effectiveness of the "wall riding" technique.

Some challenges require getting from start to finish under a certain time limit, and others call for avoiding obstacles that will disqualify the player if they are touched.

[2][3] Redline has a now-inactive community of dedicated third party developers who once constantly released new cars, tracks, weather settings, challenges, and other plug-ins for the game.

[4] Many reviewers stated that, "the graphics, while certainly not PGR3 or Gran Turismo 4 quality, are completely adequate" and "allow Redline to run on almost any Mac.

ATPM stated that the controls, when played with a keyboard, felt like the driver was slamming the pedals and suddenly jerking the wheel.