Dylan Levitt's confident 85th-minute penalty cancelled out a first-half deficit for Neil Wood's Reds, who are stepping up preparations for the upcoming Premier League 2 campaign.
Under the stifling Wiltshire sun, United had to weather an early onslaught from Richie Wellens' side, clearing two early corners, before a Swindon trialist rifled a shot into the net after 10 minutes.
Following the early breakthrough, the hosts from League Two pursued a second goal, earning a succession of corners, but failing to find a way through.
And as the opening 45 minutes progressed, Wood’s youngsters regained their composure and had opportunities to draw level before the interval.