Amerisleep AS1 vs Casper The One
Detailed side-by-side comparison — pricing, specs, performance ratings, and our pick.
| Feature | Amerisleep AS1 | Casper The One |
|---|---|---|
| Overview | ||
Type | foam | Memory Foam |
Firmness 1 = softest, 10 = firmest | 8.5 / 10 | 6.5 / 10 |
Queen Price Current / sale price | $749 | $799 |
Trial Period Return window | 100 nights | 100 nights |
Warranty | 20 years | 10 years |
| Performance Ratings | ||
Cooling Hot sleepers | Average | Moderate |
Motion Isolation Partners, light sleepers | Excellent | Excellent |
Pressure Relief Hip/shoulder pain | Average | Good |
Edge Support Sit/sleep near edge | Average | Fair |
Durability Long-term performance | Good | Good |
| Compatibility & Features | ||
Adjustable Base Head/foot elevation | ✓ Yes | ✓ Yes |
Split King Support Two Twin XL per couple | ✓ Yes | ✓ Yes |
Dual Comfort Zones Different firmness per side | — | — |
Smart Features App, sensors, auto-adjust | — | — |
Financing | Available | Affirm |
| Materials & Safety | ||
Certifications Organic / non-toxic | None listed | CertiPUR-US |
Off-Gassing New-foam smell concern | — | CertiPUR-US certified foam |
| Best For | ||
Ideal sleeper profiles |
|
|
| Actions | ||
Need Help Deciding?
For most sleepers, we recommend the Amerisleep AS1 over the Casper The One. It scores higher in edge support and delivers stronger overall value. The Casper The One is the better choice only if you specifically prefer a softer, more plush feel.
Amerisleep AS1 vs Casper The One: What Actually Differs
The Amerisleep AS1 is a foam build, while the Casper The One is a memory foam — that single difference drives most of the cooling, motion, and feel decisions below. The Casper The One stands 11" tall versus 10" for the Amerisleep AS1 — a 1.0" gap that matters if you need deep-pocket sheets or are pairing with an adjustable base. The Amerisleep AS1 is the firmer of the two at 8.5/10 (firm), and the Casper The One sits at 6.5/10 (medium-firm) — a meaningful enough gap that sleeper position and weight should drive the choice. The single largest performance gap is in pressure relief: the Casper The One rates noticeably higher than the Amerisleep AS1, which is the deciding factor if that dimension is high on your list. Queen pricing lands within $50 of each other ($749 vs $799), so price is essentially neutral — pick on feel and features rather than budget.
Which Is Better For Your Sleep Style?
Higher pressure-relief rating, which is what protects hip and shoulder contact points in the side position.
Firmness of 6.5/10 is closer to the medium-firm sweet spot back sleepers need for lumbar support (vs 8.5/10).
Firmer at 8.5/10 vs 6.5/10 — stomach sleepers need the extra support to keep the pelvis from sinking and arching the lower back.
Cooling rated the same on both — neither has a heat-management edge in our spec data.
Durability and edge-support ratings are equivalent — either holds up.
Softer at 6.5/10 vs 8.5/10 — lighter sleepers compress less, so they typically need the softer of two options to get proper contouring.
Motion isolation rated the same on both — neither has a transfer-disturbance edge.
Price Comparison (Queen)
| Mattress | MSRP | Current | Sale? |
|---|---|---|---|
| Amerisleep AS1 | $1,049 | $749 | Save $300 |
| Casper The One | $999 | $799 | Save $200 |
At current pricing the two land within $50of each other, so price isn't the deciding factor — choose on feel, firmness, and the performance gaps called out above. Both are currently below MSRP.
Amerisleep AS1
Strengths
- ✓Firmest in the Amerisleep lineup — ideal for stomach sleepers
- ✓Bio-Pur plant-based foam is more breathable than traditional memory foam
- ✓20-year warranty — longest in the Amerisleep lineup
Considerations
- —Too firm for side sleepers — inadequate pressure relief at shoulders and hips
- —Thin 10" profile has less foam comfort than higher AS models
Casper The One
Strengths
- ✓Three-layer foam build with Casper Core support
- ✓Strong motion isolation for an all-foam bed
- ✓Split King is sold from the PDP
Considerations
- —No coil edge feel
- —No active Snow cooling package
- —Medium-firm feel is less plush than Cloud One
Who Should Buy Which?
Choose the Amerisleep AS1 if you…
- →Sitting near the edge
- →Firmer support seekers
Choose the Casper The One if you…
- →Side sleepers / pressure relief
- →Organic / non-toxic priority shoppers
- →Softer feel seekers