A man who met his victims on the social networking app Grindr before robbing them at knifepoint has been sentenced to at least 17 months jail.

Corey Draper, 23, contacted the victims via Grindr, a mobile app favoured by gay, bi-sexual and bi-curious men, the Sydney District Court heard on Tuesday.

Sydney man Corey Draper has been jailed for at least 17 months. Credit:Facebook

Draper used the app to locate potential victims in his area. After chatting online, the suggestion was made to meet up to use the drug ice.

At about 1.30am, on February 9, 2014, Draper met with a 28-year-old man in Waterloo, who handed over $200 to buy ice.