The idiomatic expression "to stack up" means to accumulate or gather in a pile, often referring to things such as bills, work, tasks, evidence, or information. Full definition
While this doesn't stack up against some of the best fixed - rate cash back credit cards, it's better than the average offer available to students. (valuepenguin.com)
Although the quality of the webcam is really not that great, it does stack up against most laptops with budget cameras built in. (goodereader.com)
We'll see how everything stacks up in the coming weeks and months. (androidheadlines.com)