Solar's $0.99 price-tag didn't put us off buying it when it launched last year, but you'll have no excuse not to try out Hollr Inc's slick weather app now it is free to download. Blending an attractively minimal design with an intuitive and useful UI, Solar won't give you granular details such as wind direction and the level of humidity, but if you simply want to check the temperature, see if it's going to rain, or view the forecast for the next few days then it's a great choice. We have reached out to see how long the app will be free for, but haven't heard back yet, so if you're interested in trying it out, head to the App Store.