Do I need a visa, eVisa or ETA? Answers per passport and destination from official government sources (GOV.UK FCDO, UK Home Office, EU law, Canada IRPR, Australia Home Affairs, India e-Visa) with citations, trip checklists and change alerts. Unknown when no official data — never guessed.
Official sources: GOV.UK FCDO foreign travel advice (British citizens, 226 destinations); UK visa national list + ETA eligibility + ETA guide; EU Regulation 2018/1806 Annex I/II and Visa Code Annex IV via the EU Publications Office CELLAR API, ETIAS status from the European Commission; Canada IRPR s.7.1/s.190/Schedule 1.1; Australia ETA (601) and eVisitor (651) eligible passports; India e-Visa eligible countries.
Persistent knowledge base in a named key-value store, cache with max age, GOV.UK index-driven incremental refresh, content hashes, robots.txt checks, retries with backoff.
Pay-per-event: check, source-refresh; unknown answers are never charged; max total charge respected.