TezLab is a free lifestyle app developed by HappyFunCorp LLC for iPhone users. It is the most popular app for electric vehicle (EV) drivers as it provides insightful drive details, tracks drives, charges, and so much more. TezLab is an excellent tool for EV enthusiasts to share drives and charges, and engage with other Tesla drivers from around the world.

It's important to note that a qualified electric vehicle is required to use TezLab. The app comes with a disclaimer that it is not provided or endorsed by EV makers, and users must use it at their own risk. TezLab uses some of the same interfaces as the official EV apps, which are undocumented and unsupported by the EV makers. HappyFunCorp cannot guarantee proper operation of TezLab, and users are responsible for any changes made to their car through the app. HappyFunCorp is not liable for any damages to users, their car, or any other object in conjunction with the use of this app.

Overall, TezLab is a must-have app for any EV driver. It's user-friendly and provides valuable information that can help users make informed decisions about their vehicle.