It comes after the death of 15-year-old Natasha Ednan-Laperouse, who suffered a cardiac arrest after eating a Pret a Manger baguette containing sesame in 2016.
From December a Deliveroo trial will allow restaurants to add dish by dish allergen information, as well as making an in-app warning more prominent.
Many restaurants provide this information on their websites or encourage customers to ask staff in-store, but detailed breakdowns are not provided on delivery apps.
Thirty brands, including Tortilla, Tommi’s Burger Joint, Mildreds and Chipotle will take part in the trial, before the tool is rolled out to other national chains including YO! Sushi, PizzaExpress and Byron in January 2019.
Earlier this week Environment secretary Michael Gove said a full review of allergen labelling rules would be carried out before Christmas, followed by a consultation in to tightening the law.
He added that new legislation around the issue could be in place by next summer.
Pret has committed to showing a full list of ingredients and allergens on its packaging going forwards.