Using the BudapestGO App
Thereโs an official mobile app: BudapestGO.
You can buy single tickets and passes directly in the app โ just register and link your bank card.
If you're using single or transfer tickets via the app, you must validate them by scanning a QR code when entering the bus/tram (use the โScanโ button in the My Tickets tab).
Unlimited travelcards (24h/72h) do not require validation.
If a bus driver asks to see your ticket (usually when boarding through the front door), just tap the little ticket icon to show the QR code.
To show your ticket to an inspector, tap the โcontrollerโ icon in the top right corner of the ticket in the My Tickets tab.