There are two apps that I am unwilling to live without. One of them is brand new and shiny, the other one an oldie but a goodie.
First, lets talk about StashBot by Hannah Fettig. Have you ever walked into a store and found yarn that you absolutely love but you don't have a pattern in mind? StashBot helps you out by estimating the amount of yarn you would need for your project. You select the item (hat, mitts, sweater), the gauge (check the ball band for a rough estimate) and the size you would make and viola! StashBot gives you a yardage. This $4.99 app will save you from under or over buying yarn when you're out shopping. The downside to this app is that it is only currently available in the Apple App Store. They do have an Android version in the works but I'm not sure of its launch date.
The second app I want to talk about is Knit Companion. I have been using this app for a while now but clearly I didn't read the fine print. Up until recently I was simply using the app as a pattern reader. I finally decided to check out their short tutorial video after a podcaster raved about the app. I have discovered that you can use the app not only to track your progress on a pattern with a nice line, but it has several built in row counters too. There is a highlight function so you can mark the size you're working on And the whole thing is easy to use. I will no longer need to print out my patterns or charts, I can simply launch my pattern in Knit Companion and keep track of my progress there. If you upgrade the app you can merge multiple charts and add a legend. You can also do more customization of your projects. The downside to this app is that it is only available on Apple devices and you can't sync projects between devices. For a free app this one is a beauty!
Are there any apps that you can't live without?