Casper and Purple are two of the best-known bed-in-a-box brands, and they are close on price, trial period and warranty, so the decision comes down to feel. Casper Original is a more traditional all-foam bed with zoned support, and several comparison sites lean toward it for side sleepers. Purple Original uses a stretchy gel grid on top, which reviewers describe as cooler and bouncier, and the same sites tend to favor it for back and combination sleepers. Neither is right for everyone.
This is a research-based comparison built from brand pages and published reviews, not our own overnight testing, so we make no claim about how either bed will feel to your body. Prices change constantly with promotions, so verify current pricing on Casper and Purple before you decide.
Casper Versus Purple at a Glance
| Factor | Casper Original | Purple Original |
|---|---|---|
| Top layer | Perforated foam with airflow design | GelFlex Grid over comfort foams |
| Feel | Traditional memory foam, zoned support | Unconventional, bouncy, firm under the lumbar per reviewers |
| Sleep trial | 100 nights, per reviewers | 100 nights, per reviewers; check minimum nights before return |
| Warranty | 10 years, per reviewers | 10 years, per reviewers |
| Price | Sources range roughly from the high hundreds up (verify current pricing) | Sources range roughly from the high hundreds up (verify current pricing) |
Our individual write-ups cover each in more depth: the Casper mattress review and the Purple mattress review. For the wider field, see best mattress.
How the Two Mattresses Are Built
Casper Original is an all-foam design. Its second layer is divided into zones meant to support the spine and relieve pressure, and the base is high-density polyfoam. The top layer is perforated for airflow. Purple Original is also mostly foam, but its signature top layer is a hyper-elastic polymer grid called the GelFlex Grid, sitting over two comfort foam layers, according to a retailer listing. Construction details change between model years, so check each brand's current spec sheet.
Which Sleeping Position Each Suits
This is where published opinion splits. One comparison recommends Casper for side sleepers under 230 pounds and Purple for back sleepers under 230 pounds and combination sleepers, while another says Purple provides targeted pressure relief for side sleepers and Casper offers better edge support and back-sleeper zoning. Those conflicting takes tell you something: the real variable is your body weight, shape and preference, not the sleeping position label. Use the trial period, not a ranking, to decide.
Temperature, Motion and Responsiveness
Purple's open grid is widely credited with airflow, and reviewers also report low motion transfer, which matters for couples. Casper relies on perforated foam and zoned layers. The Purple grid also gives a springier surface that some sleepers find easier to move on, while others find the bounce odd. No source we found offered a direct measured comparison, so do not treat either as guaranteed to sleep cool.
How We Compared These Mattresses
We compared brand spec pages, retailer listings and several independent review sites, and noted where figures disagreed. We did not sleep on both beds for a month, so there are no sleep-quality scores or pain-relief claims here. Several of the review sites we read earn affiliate commissions, as does this site, so weigh any single recommendation accordingly.
Price, Trial and Warranty Fine Print
Both brands advertise a 100-night trial and a 10-year warranty, according to the reviews we read. One review notes a waiting period of about 21 days before you can return a Purple, so read the current policy for both brands, including who pays for return and how the mattress must be handled or donated. Sale pricing is frequent, with one review noting regular percentage-off promotions at Casper and a roughly $100 discount at Purple. Verify current pricing and terms before you order.
Back Pain, Allergies and When to Ask a Professional
A mattress is not a treatment for back pain or any other condition, and we make no such claim. If you have ongoing pain, numbness, or a diagnosed spine or joint condition, ask your doctor or physical therapist what support level suits you. If you have chemical sensitivities or allergies, check each brand's certification and materials pages and, where relevant, ask your clinician.
Which Mattress Fits Which Sleeper
- Prefer a classic foam hug: Casper Original.
- Run warm or like a springier surface: Purple Original is the one to trial first.
- Share a bed: Both are worth a trial; reviewers report low motion transfer on Purple.
- Heavier sleepers: Check each brand's specific guidance and consider our mattress guide for firmer options.
How to Use the Trial Period Well
A 100-night trial only helps if you use it deliberately. Sleep on the mattress in your normal position for at least several weeks, since foam beds often feel different after the first few nights as your body adjusts. Keep your old pillow and bedding the same so you are judging the mattress and not other variables, and note how you feel on waking rather than only at bedtime. Read the return terms before you open the box, including any minimum nights and how return pickup or donation works. If you share the bed, have your partner test it too, because a mattress that suits one sleeper can frustrate another. Save your order confirmation until the trial window has closed.
Setup, Foundations and Care
Both mattresses arrive compressed in a box and expand after unpacking, so allow time and space for that and for any new-mattress smell to fade. Foam beds generally need a solid or slatted base with slats close enough together to support the foam, and brand warranties often specify this, so check each warranty before choosing a frame. A removable washable cover, where offered, makes spills easier to manage, though you should follow the care label rather than assume. Rotating a mattress is not always recommended for foam beds, so read the brand's guidance. Good maintenance protects the warranty, and a waterproof protector is a sensible addition for either bed.
The bottom line: Try Casper Original if you want a traditional foam feel and Purple Original if you want a cooler, springier surface, and let the 100-night trial, not any ranking, make the final call.
