Amerisleep AS3 vs Casper The One
Detailed side-by-side comparison — pricing, specs, performance ratings, and our pick.
Pricing unavailable — visit Amerisleep for current rates
Check current price at Amerisleep →| Feature | Amerisleep AS3 | Casper The One |
|---|---|---|
| Overview | ||
Type | Memory Foam | Memory Foam |
Firmness 1 = softest, 10 = firmest | 6 / 10 | 6 / 10 |
Queen Price Current / sale price | Check retailer | $799 |
Trial Period Return window | 100 nights | 100 nights |
Warranty | 20 years | 10 years |
| Performance Ratings | ||
Cooling Hot sleepers | Moderate | Low |
Motion Isolation Partners, light sleepers | Good | Excellent |
Pressure Relief Hip/shoulder pain | Good | Good |
Edge Support Sit/sleep near edge | Fair | 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 | Affirm | Affirm |
| Materials & Safety | ||
Certifications Organic / non-toxic | CertiPUR-US | CertiPUR-US |
Off-Gassing New-foam smell concern | CertiPUR-US certified foam | CertiPUR-US certified foam |
| Best For | ||
Ideal sleeper profiles |
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| Actions | ||
Need Help Deciding?
For most sleepers, we recommend the Amerisleep AS3 over the Casper The One. It scores higher in cooling and delivers stronger overall value. The Casper The One is the better choice only if you have a strong preference for that brand's specific feel or design.
Amerisleep AS3 vs Casper The One: What Actually Differs
Both the Amerisleep AS3 and Casper The One are memory foam mattresses, so the real differences come down to firmness tuning, performance ratings, and price rather than construction type. The Amerisleep AS3 stands 12" tall versus 11" for the Casper The One — a 1.0" gap that matters if you need deep-pocket sheets or are pairing with an adjustable base. Both sit at roughly 6/10 on the firmness scale — a medium-firm feel — so neither one is the answer if you need a dramatically different support level. The single largest performance gap is in motion isolation: the Casper The One rates noticeably higher than the Amerisleep AS3, which is the deciding factor if that dimension is high on your list. On a Queen, the Casper The One runs $799 versus $999 for the Amerisleep AS3 — roughly $200 (20%) less, which is enough to factor into the decision unless the pricier model wins clearly on the specs you care about.
Which Is Better For Your Sleep Style?
Both rate the same for pressure relief — choose on firmness instead (side sleepers usually prefer the softer of the two: Casper The One at 6/10).
Both fall in the medium-firm zone back sleepers prefer (6/10 vs 6/10) — either works.
Effectively the same firmness (6/10 vs 6/10). Stomach sleepers generally want 7+/10 — neither is ideal if both rate lower.
Cooling rating not available for one or both mattresses — spec not available.
Durability and edge-support ratings are equivalent — either holds up.
Both have similar firmness and pressure-relief profile — either works.
Higher motion-isolation rating, which means less disturbance when a partner moves or gets out of bed.
Price Comparison (Queen)
| Mattress | MSRP | Current | Sale? |
|---|---|---|---|
| Casper The One | $999 | $799 | Save $200 |
| Amerisleep AS3 | $1,499 | $999 | Save $500 |
The Casper The One is the budget choice at $799 — $200 less than the Amerisleep AS3 ($999). That's a 20% gap, which is worth weighing against the spec differences before deciding which delivers better value for your situation. Both are currently below MSRP.
Amerisleep AS3
Strengths
- ✓Plant-based Bio-Pur foam
- ✓20-year warranty
- ✓Good pressure relief
- ✓Responsive feel
Considerations
- —Higher MSRP (frequent sales)
- —100-night trial (shorter than some)
- —Limited edge support
Casper The One
Strengths
- ✓Zoned Support (shoulder/hip differentiation)
- ✓Solid motion isolation
- ✓Open-cell foam for breathability
- ✓100-night trial
Considerations
- —No active cooling
- —Fair edge support
- —All-foam (no coil bounce)
Who Should Buy Which?
Choose the Casper The One if you…
- →Couples / light sleepers
- →Budget-conscious shoppers