Image caption Students facing the worries of the exam season are offered help by online tutors

Tutoring is one the world's oldest professions, but even a vocation so entrenched cannot escape the rising "Uberisation" of daily life.

Timothy Yu is founder of Hong Kong company Snapask, a mobile app that allows students to ask questions with a snapshot and then matches them with a tutor within seconds to have a one-to-one instant learning session.

Mr Yu says that private tutors working in person, rather than online, will typically earn about $20 £14 per hour, but their capacity to earn is limited by constraints of time and balancing with other work.

Tutor Hunt's John Underhill says more than 250,000 people have used its services to find tutors - and that the hunt for a tutor has moved a long way from "looking through the Yellow Pages, or peering into newsagent's windows at the multitude of cards".

Mr Underhill says taking tutoring fully online certainly has its benefits, opening up a much bigger student base to tutors, while also giving students more choice.

Nigerian companies and Tuteria also allow for solely online tuition, signalling the emergence of a truly global trend.

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