A Level That Fits in Your Pocket
Need a level right now? Download the free iHandy Level. It's great for helping you level small stuff like framed prints on walls. Just be sure to calibrate it for your smartphone before using it, which is done by setting it on a perfectly level surface and pushing a button.
Compatibility: iOS and Android
A Mechanic in Your Pocket
Search online and you'll find lots of diagnostic scan tools, but most inexpensive ones don't give all the information you need to properly diagnose your car's problems. We recently tested the BlueDriver Bluetooth Professional OBDII Scan Tool, and it's about as close as you can get to a professional scan tool without breaking the bank.
Just download the free BlueDriver app, plug the scan tool into your car's computer (look for a connector under your dashboard like the one pictured), and pair it with your mobile device.
The scan tool not only reads and clears trouble codes but also provides repair reports listing the most common causes of each trouble code based on your make, model and engine combination. It also gives you live and freeze-frame data so you can see what was going on when a problem occurred. In addition, it lets you look at raw data accumulating in the computer that hasn't yet triggered a trouble code—a feature usually available only on professional scan tools costing hundreds more.
Compatibility: iOS & Android