TripAdvisor has announced it has reached the mobile milestone of 100 million downloads for its free app for iPhone and Android.

The number of downloads more than doubled in the past year and is up six-fold from 2011.

According to data from Distimo, a global leader in business intelligence and app market data, TripAdvisor is now the most popular travel app based on total App Store downloads.

“As travel planning has shifted from something you do ahead of time to something that’s possible anytime, the TripAdvisor mobile app has become the essential companion for millions of travellers,” said Stephen Kaufer, president, TripAdvisor.

“Reaching the milestone of 100 million downloads is evidence that travellers worldwide are benefiting from the TripAdvisor community’s reviews and opinions, wherever their travels may take them.”

The free apps are available in 21 languages and are available to download at the iTunes App Store or Google Play.