Ten apps sounds like a lot. You will not need all ten. But if you travel internationally more than once a year, this is the toolkit that covers documents, entry rules, and everything around them. Not a tested ranking. Just the apps travelers actually keep.
1. Mobile Passport Control (US CBP). The official free app for faster US re-entry for eligible travelers.
2. Google Translate. The camera mode reads foreign visa forms, signs, and announcements live.
3. TripIt. Turns confirmation emails into one itinerary you can show at any counter.
4. XE Currency. Converts visa-on-arrival fees and travel budgets to your currency.
5. Google Flights. Route research first, because layover countries have their own entry rules.
6. Skyscanner. Fare hunting across flexible dates and nearby airports.
7. Kayak. Fare alerts and a trip organizer in one place.
8. Hopper. Price predictions for flights. Treat them as educated guesses, not promises.
9. Your airline's app. Boarding passes, rebooking, and real-time gate changes beat any third party.
10. Google Maps. Offline maps for arrival day, plus the fastest way to find an embassy or consulate abroad.
One honest gap: none of these ten check visa rules for you. They handle everything around the question. For the question itself, use a visa free country lookup tool by passport for the first-pass answer, and judge any visa eligibility checker app for iOS and Android on fresh data, your nationality's coverage, and offline mode. The can I go travel visa app habit plus a trip visa check app download before departure covers most travelers completely.
Apps handle the logistics. The rules still need a current source. The passport-plus-destination eligibility report at visadocs.fyi gives you the entry answer for your exact passport and destination, so the whole toolkit is working from facts.