Casper and Purple are both brands that brought genuine innovation to the mattress industry. But they’ve taken fundamentally different approaches to solving sleep comfort — approaches that suit different sleepers. This isn’t a close call once you understand the difference.
The Fundamental Difference
Casper uses foam. Purple uses a hyper-elastic polymer grid called the GelFlex Grid. The Grid is a lattice of polymer columns that buckle under pressure (cushioning) while maintaining structure alongside the pressure point (support). This means pressure relief and support simultaneously — the trade-off foam has to make. It also has near-zero heat retention because it’s essentially a grid of air pockets. Casper’s foam is familiar; Purple’s Grid requires adaptation.
Head-to-Head
Temperature: Purple wins decisively — the grid has no heat retention. Pressure relief: Purple wins for extreme pressure relief. Motion isolation: Casper foam wins — the grid transfers motion more than dense foam. Edge support: Casper wins. Familiar feel: Casper wins — Purple’s grid requires adaptation period. Trial period: Both offer 100 nights — equal.
Who Should Choose Each
Choose Purple if you sleep hot and haven’t found a mattress that keeps you comfortable, or if you’re a side sleeper with persistent pressure points who hasn’t found relief on foam. The 100-night trial is essential for evaluating whether you adapt to the feel. Choose Casper if you want reliable foam without an adaptation period, or if motion isolation is important. For a full Casper breakdown see our Casper review and for Purple see our Purple review. For couples with different preferences see our couples mattress guide.