In terms of sharpness, the iPad Air 4 has a 264ppi pixel density, which is the same rate as you find in the normal iPad and the iPad Pro.
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The iPad Pro (559 nits) gets even brighter.
That includes even the normal iPad (484 nits), which is only slightly dimmer than the Galaxy Tab S7 (499 nits). The iPad Air 4 maxes out at 440 nits of brightness, a rating that's good on its own, but outshined by its competitors. Later on, I noticed a wide range of greens in the foliage surrounding the According to our Klein K10-A colorimeter, the iPad Air 4 produces 102.9% of the sRGB color spectrum, a rate that falls under both the Galaxy Tab S7's ratings (111% on Natural mode, 152% on Vivid) and the 122.9% from the 12.9-inch iPad Pro as well. Color reproduction looked good when I watched a sneak preview for The Suicide Squad, where the reds and blues of Peacemaker's outfit practically popped off the screen. Watching a 4K version of the film Midsommar on the iPad Air 4, I saw plenty of detail when Florence Pugh's character hallucinated that her feet were made of grass, with blades of grass weaving in and out and poking up.
The iPad Air 4's screen is sharp, but it could stand to be brighter. The Samsung Galaxy Tab S7 (10 x 6.5 x 0.2 inches, 1.1 pounds) is also a touch heavier. Measuring 9.7 x 7 x 0.2 inches and weighing 1 pound even, the iPad Air 4 has the same measurements as the 11-inch iPad Pro, while being slightly thinner and lighter than the 10.2-inch iPad (9.8 x 6.8 x 0.3 inches, 1.1 pounds).