He said parents welcomed the system because it allowed them to plan ahead and order healthy lunches, without having to find the correct change to send to school.
He said more schools were signing on every week and Lunch Online served students from Auckland to Invercargill. "We've just taken an existing practice and put it on the net."
Sandra Finlay, of EZ Lunch, said it removed a lot of administrative hassles for schools.
"Schools no longer need to provide administration around order-taking or co-ordinate volunteers for lunch services," Finlay said. "It removes one more administrative task and allows them to spend time on other things."
Janine Collins started The Lunch Box Club in Whangarei just over a month ago and said three local primary schools had signed up. Interest had also been expressed from other parts of the country.
Her website sent orders directly to the suppliers who delivered the food to schools and her business took a commission. She said suppliers saw it as a way to make a bit of extra money on the side. "It's a way to get your name out there."
Chapman said as more schools signed up for the schemes, more suppliers would come on board.
In Hawke's Bay, multiple businesses were filling orders but in Christchurch, one provider dealt with all of them.
His business mostly worked with bakeries, supplying the ever-popular sausage rolls, pies and muffins, although he said sushi was now also popular.
EZ Lunch received national recognition at the end of last year when Finlay was nominated as one of New Zealand's top three female entrepreneurs.