If necessity is truly the mother of invention, then these three travel apps are worthy of your attention.

First is something called Jetradar.

Very few low cost airlines are displayed on the big online travel agency websites.

That’s particularly true of European carriers such as Ryanair or Easyjet.

Jetradar is a very popular search engine in Europe that displays budget airlines you won’t find on most other sites.

I also like something called Chefs Feed. If you’re a foodie, this app is perfect.

It’s written by chefs, and they share their favorite places to eat throughout the U.S., Canada, and London.

Then there’s the app Wolfram Sun Exposure. The concept is simple but necessary.

Just enter your skin type and it tells you exactly how long you can stay in the sun.

It already knows your exact location.

For more information about apps you can use while you’re traveling, check out:

• New Apps in Airports Make it Easier for You to Order Food
• Need to Stick to Your Travel Budget? These Apps Can Help
• Apps You Can Use When You’re Traveling to Other Countries

Keep reading for more travel tips.