For developers, it could be a good source of extra income. That said, some developers have reported huge download numbers off the back of the free app of the day promotion, but no resulting increase in sales once the promotion is over. You are also likely to do better with tablet optimized apps than smartphone apps in general, as Kindle users are the primary customers. Android App

At its core, Any.do is a list manager. You can quickly create a shopping list and have it synced among your devices and even share the list with others. The app also doubles as a task manager, keeping you on top of what needs to be done. This very capable app sports many features, but we particularly like one called the Any.do Moment, which encourages you to take a second and review your plans for the day. Lists are one thing, but building good productivity habits is quite another. Android App

Amazon is the internet's marketplace; the one place where you can buy just about anything—and it's cheap too! On Android, two of our favorite features are the integrated Alexa voice commands and the photo search, which makes it easy to surreptitiously compare Amazon's prices to those of the brick and mortar stores it is killing. Amazon Video-related functionality has been moved over to its own dedicated app, but all of its other consumer services, including Fresh and Restaurants, make an appearance. Prime members rejoice; there's never been a better way to stay connected with your Amazon lifestyle. New Droid Apps
This calorie counter and exercise tracker aims to help you lose weight the old-fashioned way—expending more calories than you take in. With its smart design and an extensive library of foods, it makes quickly logging the calories you take in and what you burn while exercising a snap. A barcode scanner makes it even easier to log that post-workout snack. This fitness app also plays nice with other such apps, so your data won't be tied up in just one place. MyFitnessPal won't give you a whole workout regimen, but it can make you more aware of your habits. PCMag has a full review of MyFitnessPal for the iPhone. Droid App
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