Roadtrippers is a must-have for anyone planning a road trip in the United States. You enter where you want to go, make selections depending on what you want to see (natural wonders! weird stuff!), and the app will create a customized map for you.
Find other cool places to stop on your journey using AroundMe, iExit, and Field Trip.
4. Travel Math
If your brain is frazzled at the mere idea of organizing a trip, let Travel Math do all the calculations for you: it'll measure distances, travel times, budgets--whatever you need to know.
7. Pack Point
Pack Point helps you decide what to pack depending on where you're going, what the weather will be like, and what sort of activities you'll be participating in.
Another similar option - Travel List.
Your daughter is throwing up everywhere and suddenly going on vacation is no longer an option: What do you do about your hotel room? Get rid of it using Roomer. You list your room and wait to hear from someone who wants to take over your reservation — no more losing money on cancellation fees!
10. Jet Lag Rooster
Jet Lag Rooster will tell you how to shift your sleeping schedule in the days before a trip so you won't be exhausted once you reach your destination.
The last thing you want to do when you get back from a trip is wander around the airport parking garage for 30 minutes, exasperatedly searching for your vehicle: Dude Where's My Car keeps track of *exactly* where you parked and will guide you back to that spot. Plus, it also helps you find parking.
Did you know that you can use a ton of airport lounges even if you aren't a first class passenger? Sometimes it's worth paying a fee if it means getting to wait for your flight in a comfortable spot--Loungebuddy will let you know what your options are at the airport you're flying out of.
13. My TSA
Can you bring _____ through airport security? Open up My TSA and you'll know in an instant. You can also use the app to look up how long the security wait times are at your airport so you'll be sure to arrive early enough to make your flight.
For more help navigating an airport like a pro, take a look at GateGuru and Flight Aware.
14. Track My Tour
This app allows your loved ones to "join" you on a trip from the comfort of their homes: they "follow a breadcrumb trail of your tour by visiting the link you sent them," while you document the most exciting spots you visit as you go--it's the easiest way to keep people in the loop.
Providing you with "90+ languages in your pocket," iTranslate is one of the best translator apps available. If you're heading to the Netherlands and you can't speak Dutch, this is a necessity.
Another awesome option = Trip Lingo.
17. City Papers
Find out what's happening in the city or town you're visiting using the collection of local newspapers available on the City Papers App: you'll be able to discover concerts, craft sales, and other events that may not even be listed online.
When you're in a new place (for work or on vacation), open up this app and it will give you a list of popular nearby bars *plus* what sorts of beer are on tap there. You want to to find someplace that serves a state-specific microbrew? This is how to hunt a glass of that down.
19. TV Food Maps
If you're more interested in food tourism than beer tourism, take a gander at TV Food Maps: it's a guide to restaurants that are featured on popular TV series like Chopped and Diners, Drive-ins and Dives.
For more dining recommendations, check out Flavour and Open Table.
20. Happy Cow
Depending on what part of the country (or world) you're in, it can be difficult to find vegan or vegetarian friendly restaurants: When you want some help with your search, browse through the listings on Happy Cow--you'll find dining establishments with meat-free options all over the world.
Vayable is a way to discover "unique experiences offered by locals" on your next trip. All of the available options sound so much cooler than traditional city tours: A midnight street food crawl! A guide to the most photogenic places in Paris! DIY seafood with a sea forager!
Don't enter the gates of the Magic Kingdom at Disney World without downloading this useful app. You can access real-time wait times, so keep checking to see how long the wait is at Splash Mountain and *SPRINT* over there when it says it's only 15 minutes. You can also make dining reservations, look up parade showtimes, and more.
If you're going to Disneyland, download this app instead.
If you want a simple way to figure out how much a Euro equals in USD, use Currency Converter (it will do calculations for over 160 currencies from all over the world).
25. Fancy Tips
Don't piss off the local waiters and bellhops--check out Tip Fast to see what the typical tipping habits are in over 240 countries and regions.
26. Wi-Fi Finder
Use Wi-Fi Finder to find locations where you can use Wi-Fi for free. It works worldwide, so be sure to download it before your next trip to avoid being charged pricey roaming fees.