Some tools are free, while others are free with feature limitations. Those are good places to start so you can get a feel for the tool before slapping down your credit card for a subscription. Introducing:
App Annie http://www.appannie.com/ – Store Stats are free; other services start at $59 per month. We highly recommend App Annie, especially for its daily e-mail reports and analytics. However, this tool is often overlooked for its app store optimization features.
The Market Data section breaks down the top app companies; top games (and more) by Store (iOS and Google Play); by country and by month. For example, in January 2015, the top iOS game downloaded worldwide was Trivia Crack.
On the ASO side of things, you can dig deep into any app to view its targeted keywords and rankings. The app’s Rank History; Reviews; Ratings and how many times it was Features in the iTunes Store are also available.
Once you have an app published, App Annie tracks all the aforementioned stats for your company. For example, on the keyword “trout” our game “The Trout Family Swim and Fish Adventure” ranked No. 4 in the iTunes Store with 117 total apps optimized for the “trout” keyword. Not bad!
Sensor Tower http://sensortower.com/ – 14-day free trial; then $79 per month and up. We use this online tool every day and it’s we’ll worth the monthly fee. With an “Indie Developers” package, you can track up to 80 keywords for approximately 4-5 apps, depending on the total number of keywords.
There are many awesome features, but we are especially fond of Sensor Tower’s Keyword Research and Keyword Suggestion tools. The Keyword Spy feature allows you to take a peek at the keywords other apps are targeting which help generate good keyword ideas.
Keyword analysis, ranking and tracking your own apps is a given here, but a quick glance gives you a daily snapshot of how well your app is ranking for each keyword in both iPhone and iPad search results.
AppCodes http://appcodes.com – $14.95 per month; free demo account for testing the service; easy to use. A simple search for a keyword will return a list of apps (in ranking order) optimized for the targeted keyword. The service’s Search Queries feature quickly reveals six columns of information, including a conservative “chance” you have of ranking well on that keyword.
SearchMan http://searchman.com – Sign up for free; $25 per app per month. We recommend signing up for free and doing a test drive, but this online service may prove to be a little pricey for some developers.
Now you are armed with some great online ASO keyword research resources.