Amerisleep AS3 vs Casper The One
Detailed side-by-side comparison — pricing, specs, performance ratings, and our pick.
| Feature | Amerisleep AS3 | Casper The One |
|---|---|---|
| Overview | ||
Type | Memory Foam | Memory Foam |
Firmness 1 = softest, 10 = firmest | 5.5 / 10 | 6.5 / 10 |
Queen Price Current / sale price | $1,749 | $799 |
Trial Period Return window | 100 nights | 100 nights |
Warranty | 20 years | 10 years |
| Performance Ratings | ||
Cooling Hot sleepers | 8/10 | Moderate |
Motion Isolation Partners, light sleepers | 9/10 | Excellent |
Pressure Relief Hip/shoulder pain | 8/10 | Good |
Edge Support Sit/sleep near edge | 6/10 | Fair |
Durability Long-term performance | 5/10 | 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, Klarna | 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 Casper The One over the Amerisleep AS3. It scores higher in cooling, motion isolation, pressure relief and offers strong overall value at $799 (vs $1,749). The Amerisleep AS3 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. The Casper The One is the firmer of the two at 6.5/10 (medium-firm), and the Amerisleep AS3 sits at 5.5/10 (medium) — a meaningful enough gap that sleeper position and weight should drive the choice. On a Queen, the Casper The One runs $799 versus $1,749 for the Amerisleep AS3 — roughly $950 (54%) 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?
Pressure-relief data not available for one or both mattresses — spec not available.
Both fall in the medium-firm zone back sleepers prefer (5.5/10 vs 6.5/10) — either works.
Firmer at 6.5/10 vs 5.5/10 — stomach sleepers need the extra support to keep the pelvis from sinking and arching the lower back.
Cooling rating not available for one or both mattresses — spec not available.
Durability and edge-support ratings not available — spec not available.
Softer at 5.5/10 vs 6.5/10 — lighter sleepers compress less, so they typically need the softer of two options to get proper contouring.
Motion-isolation data not available for one or both mattresses — spec not available.
Price Comparison (Queen)
| Mattress | MSRP | Current | Sale? |
|---|---|---|---|
| Casper The One | $999 | $799 | Save $200 |
| Amerisleep AS3 | $1,749 | $1,749 | At MSRP |
The Casper The One is the budget choice at $799 — $950 less than the Amerisleep AS3 ($1,749). That's a 54% gap, which is worth weighing against the spec differences before deciding which delivers better value for your situation. Only the Casper The One is on sale right now.
Amerisleep AS3
Strengths
- ✓Medium feel fits a broad sleeper range
- ✓Strong motion isolation for couples
- ✓HIVE zoning gives extra shoulder and hip pressure relief
Considerations
- —Current page payload did not publish per-size sale prices, so sale fields are intentionally NULL
- —All-foam edge support is more modest than AS3 Hybrid
- —Shoppers who want a springy feel may prefer the hybrid
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 AS3 if you…
- →Shoppers who prioritize brand reputation and style
Choose the Casper The One if you…
- →Hot sleepers
- →Couples / light sleepers
- →Side sleepers / pressure relief
- →Budget-conscious shoppers