Grab
Free app; rides ฿60–300 typical in Bangkok
Rides, food delivery, groceries and payments in one app — the closest thing Southeast Asia has to essential infrastructure.
Before you fly
Bangkok MRT / BTS SkyTrain
Free app; ฿17–62 per ride
The only reliable way to cross Bangkok at rush hour — elevated above the traffic that stops everything else.
Transit, walking and live traffic — and in Bangkok the traffic layer is a genuine planning tool.
Before you fly
Airalo / local tourist SIM
eSIM from ~US$5; physical tourist SIM ฿300–600
Grab, maps and delivery all need data, and a Thai number unlocks the local apps properly.
Before you fly
Wise / Revolut
Free account; ~0.4–0.6% conversion
Thai ATMs charge a flat ฿220 per withdrawal, so fee-free withdrawals and good rates matter more here.
Before you fly
Thailand is a LINE country — hotels, tour operators and drivers all use it.
Before you fly
Thai script is unreadable without help, and camera translation handles menus and signs.
Before you fly
Islands transfers, ferry tickets and attraction entry, usually below the counter price.
Consistently the deepest Southeast Asian hotel inventory, including small guesthouses other sites miss.
Northern Thailand's burning season produces genuinely hazardous air, and you need real numbers to plan around it.