Apps have become essential travel companions. If you want to have a hassle-free trip, it's best that you have them on your smartphone. No have no idea where to go? Want to book a car? Meet new friends or find a date? Convert money? There's an app for every single one of these things. 

Here, we'll focus on the iPhone and its app must-haves. Download these for a hassle-free trip. 

Citymapper

This app aids users to find the nearest public transit line and helps them figure out complicated city bus system by just typing the address the user is currently at. Landmarks, shops, or restaurant names can also be used to search for public transportation if the user is unsure of the exact location.

Yelp

A business evaluation site, Yelp gathers millions of reviews and ratings of people who share their experience being a consumer in a particular establishment, whether it's a restaurant or hotel accommodations. The app also shows establishments near you if you ever want to locate restaurants that are highly recommended. You need to sign up in their site if you ever want to leave a review.

Kayak PRO

Kayak helps users search and book for hotels, car rentals, or flights. It also shows descriptions of the establishments and few reviews of consumers. Users can book in advance or look for a spot on the last minute.

DuoLingo

DuoLingo is a free fun language app for those who want to learn the basics of a language. The app currently offers translations of Spanish, French, German, Portuguese, Italian, Irish, Dutch, Danish, Swedish, and English languages.

HiConverter

This app basically converts everything ranging from the current currency to clothes and shoe size. It can show multiple conversion at once like displaying eight converted money currency of different countries so users can compare the digits.