Doha's public transit card is the Karwa Smartcard.
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Doha uses the Karwa Smartcard. The Karwa Smartcard covers the Doha Metro, which is modern, clean, and easy for visitors to use.
You can buy it at metro stations.
Usually yes — it's typically faster than buying paper tickets and often cheaper per ride, even for just a couple of days.
In some cities you can tap a contactless card or phone directly, though it's worth checking current signage or the transit authority's site, since not every system supports it yet.