Here is how these two tents compare on the numbers. They score within a hair of each other, so it comes down to the details below.
| Zpacks Duplex | Zpacks Altaplex Pro | |
|---|---|---|
| GearScore | 86✓ | 84 |
| Capacity | 2 | 1 |
| Packed weight | 17.8 oz | 15.2 oz✓ |
| Floor area | 28.1 sq ft✓ | 25 sq ft |
| Space-to-weight | 25.3 /lb | 26.3 /lb✓ |
| Peak height | 48 in | 58 in✓ |
| Doors | 2 | 2 |
| Vestibules | 2 | 2 |
| Price | $749 | $749 |
| Type | Ultralight | Ultralight |
Highlighted cells mark the better spec: Duplex in blue, Altaplex Pro in amber. A blank spec is never counted as a win. GearScore is the overall rating (0 to 100); re-weight it on the full tent comparison. Prices are current MSRP.
The Zpacks Duplex against the Zpacks Altaplex Pro is a study in priorities. They are close enough that this really is about which handful of specs you weight most.
The Duplex is more floor area (28.1 vs 25 sq ft). The Altaplex Pro is 3 oz lighter, better space-to-weight, and taller (58 vs 48 in peak). Their GearScores land within a couple of points (86 vs 84), so neither runs away with it.
Pick the Duplex if you care most about floor space, which makes it the better call for comfort and room to move. Pick the Altaplex Pro if low weight and space-to-weight matter more to you, or you are focused on counting grams on long miles.
The Zpacks Duplex. It is more floor area (28.1 vs 25 sq ft) than the Altaplex Pro.
The Zpacks Altaplex Pro. It is 3 oz lighter than the Duplex.
They are nearly tied at 86 and 84 on the default algorithm, so re-weight the score to your own priorities to break the tie.
It depends on your priorities. Go with the Duplex for floor space, or the Altaplex Pro for low weight. The spec table above shows exactly where each wins.