Triptease has raised a further $4 million in its Series B round, bringing the total investment in the company to date to almost $25 million.
The six-year-old company's latest round follows the £9 million for its initial Series B cap-injection that it took in April 2017.
Backers of both tranches of the £13 million total round are the Business Growth Fund and Notion Capital.
Triptease's core product is its Direct Booking Platform - a system that integrates with a hotel's website and booking engine to drive reservations from consumers without the use of online travel agencies.
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The capital from the top-up round will be used to expand the business in Asia Pacific, where the company an office in Singapore in 2017.
A general manager for the region is expected to be appointed soon, the company says.
The investment money will also support the development and roll-out of its automated, on-site chatbot for hotel websites.
Founder Charlie Osmond says: "A direct relationship with customers reduces a hotel’s spend on middleman commissions whilst allowing them to offer cutting-edge services like mobile check-in alongside ancillary upsells.
"Savvy consumers have also started to realise hotels prefer guests who book direct. Room upgrades and special incentives have become commonplace benefits for booking direct."
The company has raised money at a steady pace since 2012, bringing in $2 million in 2015, $8 million during 2016, ahead of the recent $13 million over the course of the last 13 months.