Today's Free App of the Day is KAYAK PRO
Originally $0.99

This is not an app for kayakers, which was the apparently sincere complaint by one reviewer. It is a travel services app. The only difference between this and the free version is that ads have been removed. There are some complaints about permissions, but from what I can see, the permissions are appropriate for what the app does.

It is mostly a search tool for travel through the Kayak website. You should be aware that some airlines, such as Southwest, aren't included in these kinds of search tools. It also has a flight tracker; the airlines whose flights one can track is also limited--Southwest, for example, is not one of the 25 options. For me, the biggest value of these kinds of apps is the ability to put all your travel info in one place by trip. You can forward booking receipts to [email protected] The receipt has to have been mailed either to the email address that you registered with or you can add additional email addresses (for example, I added my husband's email address). Processing can take a bit, but Kayak will send you a notification that the email has been received.

82 of 147 reviews are four stars and above.

We have a bonus pick: TripIt Travel Organizer Free.

This is another trip planner. It doesn't allow you to search for flights, etc. But is quite good at saving your information about flights, etc, in one place. I've used this one for years. You can have it monitor your mailbox for emails that pertain to travel, e.g., tickets, lodging and rental car reservations, or, if that's too creepy for you, you can send emails to [email protected]

There is also an ad-free version for $3.99; you get 120 coins back, so the effective price is $2.79.

120 of 159 reviews are four stars and above.

These apps are compatible with the original Fire and with my Fire HDXs. To tell if an app works for your Fire HD or other Android device registered to your Amazon account, click on the above link and look on the right side of the web page. Amazon will tell you if it will work with your registered device.

Have fun!

Also check out the other digital deals from Amazon, including great deals on MP3s and videos: