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Tools & Resources

Tools & Travel Resources

Free travel calculators and reference guides. No signup, no paywall. Use the calculators to answer a specific question; use the guides to research before you book.

7 calculators 12 reference guides 75 airlines 70 airports 86+ destinations

Calculators & Checkers

Interactive tools that answer one question: does this bag fit, what will this cruise cabin look like, how long is this layover.

Carry-On Size Checker

  • 75 airlines

Enter your bag's dimensions and see exactly which airlines accept it as a carry-on. Covers weight limits and fees for every major carrier.

Check your bag

Checked Bag Fees

  • 75 airlines

Compare checked bag fees across every major airline. First bag, second bag, international, overweight, and oversize charges with a calculator that estimates your total trip cost.

Compare fees

Connection Time Calculator

  • 70 airports

Check if your layover is long enough. Factors in minimum connection times, terminal transfers, customs, TSA re-screening, and checked-bag recheck. Verdict: tight, comfortable, or long enough to leave.

Check a connection

Cruise Cabin Size Checker

  • 4 cabin types

Look up stateroom square footage by cruise line, ship, and cabin category. Interior, oceanview, balcony, and suite sizes. Values we cannot independently verify are flagged "Not published" rather than guessed.

Check a cabin

Power Adapter Finder

  • 200+ countries

Find the right travel power adapter for your destination. Covers 200+ countries with plug types, voltage and frequency info, and whether you need just an adapter or also a voltage converter.

Find your adapter

Travel Resources

Reference guides, head-to-head comparisons, and destination planning resources.

Cruises & Destinations

Cruise lines, ports, packing lists, and head-to-head destination comparisons.

Cruise Line Guides

  • 10 lines

Structured guides to major cruise lines: fleet, ship classes, dress code, US homeports, and who each line fits best. Every factual claim cited to the line's own pages.

Look up a cruise line

Cruise Port Guides

  • 16 ports

US and international cruise ports with nearest airport, cruise lines homeporting here, and typical itineraries. Source links for parking and terminal details you need to verify.

Find a cruise port

Compare Cruise Lines

  • 45 comparisons

Head-to-head cruise line comparisons: Royal Caribbean vs Carnival, Disney vs Royal Caribbean, and more. Unverified figures flagged rather than guessed.

Compare two cruise lines

Compare Destinations

  • 60 comparisons

Head-to-head destination comparisons: Paris vs Rome, Tokyo vs Kyoto, and more. Costs, transit, food, and who each city fits best, with verdicts backed by current data.

Compare two destinations

Compare Travel Apps

  • 7 comparisons

Head-to-head travel app comparisons: TripIt vs Wanderlog, Kayak vs Skyscanner, and more. Planning features, offline support, collaboration, and pricing compared pair-by-pair.

Compare two apps

Compare Travel eSIMs

  • 8 comparisons

Head-to-head travel eSIM comparisons: Airalo vs Holafly, Holafly vs Saily, best eSIM for Japan, best eSIM for Europe. Pricing, country coverage, unlimited plan rules, 5G support, and real Reddit reliability reports.

Compare two eSIMs

Packing Lists by Destination

  • 86 destinations

Comprehensive, season-by-season packing guides for popular travel destinations. Each list covers what to pack, seasonal weather tips, and FAQs from real travelers.

Browse destinations

Roamly

Live

AI-powered group trip planner. Collaborate with friends, generate smart itineraries, split budgets, and explore destination guides built for your crew.

Plan a trip

How to use these tools

Everything here is free, no signup, no paywall. The tools fall into two groups: interactive calculators answer a specific question, reference resources support deeper research.

Interactive

Calculators & checkers

Answer a specific question in a few seconds: does this bag fit, what will this airline charge me, how big is this cruise cabin.

Reference

Travel resources

Deeper lookups for research before you book: airline baggage policies, airport and cruise port guides, and destination packing lists.

Before a flight

The two tools that save the most money are the carry-on size checker (especially for Spirit, Frontier, Ryanair, and Wizz Air) and the checked bag fees tool. If you want the narrative version, read the avoid checked baggage fees guide or the 22-inch suitcase fit guide.

Before a cruise

Start with the cruise line guides, use the cruise cabin size checker before you book, and compare pair-by-pair with the head-to-head cruise comparisons. For embarkation day, the cruise port guides and the airport-to-port guides in the guides section walk you through the transfer.

For destination planning

The packing lists by destination cover 60-plus country and city options with season-specific picks, and the PackSmart AI generator builds a personalized list from real-time weather and your activities. If you run a travel blog, our free embeddable widgets drop live airline data onto any page with a short HTML snippet, including a per-airline reference card, a bag-fit checker that shows which airlines accept a specific bag size, and a checked bag fee calculator that sorts airlines cheapest first.

Frequently asked questions

  1. What tools does Vientapps offer?
    Vientapps offers two categories of free resources. Calculators and checkers include PackSmart (AI packing list generator with real-time weather), a Carry-On Size Checker, Checked Bag Fee calculator, Cruise Cabin Size Checker, ShipReady SEO Scanner, and free embeddable widgets for travel blogs (a carry-on reference widget and a bag-fit checker widget). Travel resources include airline baggage policy guides for 50+ airlines, head-to-head airline and cruise line comparisons, airport guides for 30+ major airports, cruise line and port guides, packing lists for 60+ destinations, and Roamly (AI group trip planner).
  2. What is the difference between calculators and travel resources?
    Calculators and checkers are interactive tools where you enter your specific details (bag dimensions, destination, travel dates) and get a personalized result. Travel resources are in-depth reference guides, comparison articles, and informational hubs you can browse to research airlines, airports, cruise lines, and destinations before your trip.
  3. Are these tools free to use?
    Yes, all Vientapps tools and travel resources are completely free to use. There are no subscriptions, hidden fees, or usage limits. Just open the tool or resource you need and start using it right away.
  4. How does PackSmart generate a packing list?
    PackSmart uses AI combined with real-time weather data for your destination and travel dates. You enter where you are going and when, and it generates a personalized packing checklist tailored to the local climate, your planned activities, and trip duration.
  5. Do these tools require an account?
    No. Every tool and resource is completely free to use with no account required. There is no signup, no login, and no paywall.
  6. Can I embed these widgets on my site?
    Yes. The free embeddable widgets work on WordPress, Squarespace, and plain HTML. Add a carry-on size reference card, a bag-fit checker, or a checked bag fee calculator to any travel blog with a short HTML snippet. All widgets auto-update with current airline data.