I'm stuck at home taking care of a sick child, when a familiar feeling suddenly hits - a craving for durian.

But there's no need to head out to a durian stall or supermarket to buy the tropical fruit, lug it home, and wrestle open its spiky husk.

I just whip out my phone, open an app called Grab, and make a few taps.

Forty-five minutes later, there's a knock on my door. A deliveryman hands over a bag: it's my durian, freshly shucked and sealed in plastic tubs, ready to eat.

From ordering cabs and food, to paying our bills and booking holidays, super-apps like Grab offer a mindboggling array of services. They don't exist yet in the West - Elon Musk is thinking of creating one called X - but in many parts of Asia they've already been a vital part of our everyday lives for the past few years.

I mostly use Grab to get a ride home after a night out, or order Thai takeaway when I haven't got the energy to cook dinner for the family.

But many in Singapore also use it to send parcels and documents, or shop online - one colleague just purchased a home karaoke set.

Other extensions allow you to book bus and ferry tickets, make hotel reservations, and even arrange for someone to come to your home and do a professional Covid swab test.

These can be paid for through the app's finance system. There's an e-wallet linked to your bank account or credit card, or you can set up instalment plans, or pay with points which you earn with every activity done through the app.

It can also be used for cashless payments - you pay for items at a shop by scanning a QR code with the app, or you can get a physical card linked to your account.

But Grab is not the only player in town.

There are super-apps aplenty from Indonesia's GoJek to India's PayTM and they allow you to do even more, such as book a manicure, order fuel for your motorbike, pay your traffic fine and purchase gold.

They have caught on in a region of digital natives - in South East Asia alone, about three-quarters of our population use the internet, and of that group, 88% own a smartphone.