1. PassportPower: passport plus destination gives requirements, fees, day limits, and processing times, $9.99 one-time per destination.
  2. Sherpa: solid requirement lookup, widely embedded in airline booking flows.
  3. iVisa: checker plus filing service at a markup.
  4. Official government portals: the final word, always worth a direct check.
  5. Timatic: the database airlines use at check-in. Some consumer tools expose it.

Sources: U.S. State Department, IATA Travel Centre

Top 5 Apps for Checking Visa Requirements Before You Book
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The best visa check software covers 190+ nationalities and links the official portal for each answer.

The best visa check software tells you more than "Visa required." Rank apps by what they tell you: The useful answer includes the fee, the day limit, the processing time, and the official portal link. Anything less and you will be doing a second search anyway. Check before you book, because the visa answer occasionally changes the destination.