There are so many apps available for the iPhone, one might even say there are a plethora. We would like to take a moment to help you find a few that might help with your hacking projects. Ever have problems remember a formula when you need it? Need to track the acceleration of your brand new rover? How about beginners needing help remember resistor codes. Well, there’s an app for that. Check out our suggestions after the break.

Here at Hack A Day, we are strong believers in frugality. We think most hackers are. With that in mind, lets start off with our recommendations of free applications to get the job done. These are in no particular order.

The iPhone camera: Not only is this free, its already on your iPhone. yeah, we know its not a great camera, but it is indispensable. Taking apart a project? Snap some pics along the way so you can refer back to them when you reassemble. Project ready for testing? Document it quickly and easy with pictures. Project burst into flames on the tarmac? Snap a pic for posterity. We love the camera.

Electrical toolkit: Even the most experienced hackers need a little help Â*sometimes. Need to find the SCR Firing angles this app can help with that.

Electronics toolkit: Another app meant to help us find the missing pieces to a circuit. This one has some different circuits than the Electrical toolkit above.

iResist: Maybe you never committed the resistor codes to memory, or maybe you’re a beginner just learning. Either way, this appears to be a pretty useful application. Simply select the appropriate colors and it will tell you the value of your resistor.

ResistorCode: Another resistor code application. This one has the ability to do up to 6 band resistors. We listed both because some people really have a preference between the text selection or color selection. We like the more robust feature set of this one.

LED resist: Who hasn’t been left scratching their head when wiring LEDs? This handy little app will help you figure out what resistance value is needed to keep those LEDs functioning optimally.

Runkeeper free: Runners have been raving about this one for a while now. It will track your time, distance, GPS location, and speed. You can view your path on a google map. We’re not exactly sure what project would merit this, but it just seems perfect for tracking rovers or measuring experimental vehicle performance.
Though we do love the free applications, sometimes things just merit a little payment. We really only found 2 apps that we thought could be useful enough to pay for when it comes to hacking.

Formula Pro: We don’t care how l337 of a hacker you are. You simply can’t know everything. This application is a compendium of the most common formulas needed for Engineering, Optics, Thermodynamics, Electronics and much more. There are over 680 formulas out of the box, with features like the ability to modify and save formulas or even add your own. At 1.99, this is a steal.

Accelleration 3d detector: This feature rich acceleration detector will log and chart in 3d your acceleration information. You can even download the results to your computer for inspection. Though we have concerns about the destruction of our iPhone, this just seems like it would be a great tool in a pinch for finding out some acceleration data.

Lastly, we understand that no project goes perfectly. Sometimes you are so frustrated and your brain is so fried, you just can’t function. It is times like these that Bubble Snap comes to the rescue. There are no rules, just the soothing pleasure of popping bubble wrap. Careful though, your kids or significant others might get addicted to this one and steal your phone.
Well, those are our favorites. What do you use? Did we miss any? The iPhone is supposed support accessories with the latest iteration, are there any must have accessories for the hacker?