ohhh... I'm sorry your an I-phone user, maybe you should contemplate finding a cure for your illness (Iphoneitis) and getting a phone with an open source app market, such as a Droid based phone.
Yes, there is till hope yet.
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Don't believe everything you read on the Internet!
Electrodroid! has resistor colorcode calculator, simple ohms law calculator, pin outs for various widely used IC's and cables, Cap charge calculator... Pretty handy if you are stuck doing work with someone who doesn't put components back in properly labeled bins.
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The early bird may get the worm, but the second mouse get's the cheese.