I was recently waiting for a client to email me a contract I needed to sign in order to get paid--that's important. Naturally, the contract, which turned out to be five separate documents, arrived while I was on vacation and I didn't have access to a printer or scanner.\n\tI had three options: 1) Wait until I got home to sign the docs, which meant I'd have to wait two extra weeks to get paid; 2) Find a FedEx Kinko\u2019s, mail the document to them, have them print the docs, manually sign them all and then fax or scan the signed docs; or 3) Use this as a golden opportunity to investigate mobile apps that let you digitally sign documents.\n\tI chose option number three and downloaded SignMyPad ($4) for iPad and SignNow (free) for Android. The iPad app did the trick, but it took me a while to get all five contracts signed and emailed. The Android app was a total bust. (SignMyPad is also available on Android for $4.)\n\tSignMyPad lets you add text, such as a date, as well as a signature to PDF documents you receive via email or download from Google Docs, Dropbox, the Web or iTunes. With your finger or a stylus, you create a signature on the iPad\u2019s touch screen that the app stores for later use. You can create additional signatures for a dollar each through in-app purchases. (The SignMyPadPro app for iPad adds geo-tagging to saved PDFs, but it\u2019s $19\u2014not worth the extra $15, in my opinion.)\n\tSignMyPad lets you save signed documents and then attach them to email messages or upload them to Dropbox, to an app, or to a printer. Unfortunately, the app didn't let me attach all five signed documents to one email, so I had to send each document separately. Also, it often deleted the names I assigned to each saved contract, so I had to manually rename them. And the app frequently crashed when I touched the "PDF List" button.\n\tEven with those drawbacks, SignMyPad was way more useful than SignNow, the free Android app. SignNow lets you open a PDF or Word document you pull from an email, Dropbox, your device\u2019s camera or other source. You can then sign it using your finger and the touchscreen and then email the signed document. The app also lets you enter text. Well. it's supposed to let you enter text.\n\tThe reality: I could never get my text\u2014the date on which I signed the contract\u2014into its designated field on the document, because the app\u2019s drag and drop placement never worked properly. I entered the date, and it showed up at the top of the following page. I couldn\u2019t drag it back onto the page where it needed to be, no matter how hard I tried. The same was true with my signature; I created the signature without incident but could never get it positioned in the contract\u2019s signature field.\n\tEventually, I just gave up. SignNow, which is free, proves the old adage: you get what you pay for. SignMyPad, on the other hand, is well worth $4 if you're an iPad user and you want to be able to sign documents while on the go.