PerfExpert is the onboard dyno app that lets you accurately measure your car’s horsepower and torque using just your smartphone. Running your own dyno test is now simple and reliable: create your car profile, mount your phone securely, and perform a full-throttle acceleration from low rpm to redline — all in one gear. Don’t guess — measure. Start testing your car’s real performance and compare the results of your tuning upgrades with PerfExpert!