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iPhone Duo vs iPhone 18 Pro Max

Which one shows video bigger? Drawn to physical scale.

For 16:9 video, the iPhone Duo shows a picture about 7.1″ across and the iPhone 18 Pro Max about 5.9″. The iPhone Duo shows it 1.47× larger by area.

iPhone Duo and iPhone 18 Pro Max screens overlaid to scale, showing 16:9 video
16:9 · YouTube · TV

Same brand, two shapes. The 18 Pro Max has the taller screen, but tall is wasted on 16:9 video: rotated to landscape it fits a strip barely wider than the Duo shows while held normally. Unfold the Duo and widescreen content gets dramatically bigger.

Open this comparison in the tool →
iPhone Duo and iPhone 18 Pro Max screens overlaid to scale, showing 9:16 video
9:16 · TikTok · Reels · Shorts
iPhone Duo and iPhone 18 Pro Max screens overlaid to scale, showing 2.39:1 video
2.39:1 · Movies (widescreen)
Content size per format, best orientation for each device
FormatiPhone DuoiPhone 18 Pro MaxLarger
16:9 YouTube · TV≈7.1″≈5.9″iPhone Duo · 1.47×
9:16 TikTok · Reels · Shorts≈7.1″≈5.9″iPhone Duo · 1.47×
4:3 Classic TV · iPad≈7.3″≈4.8″iPhone Duo · 2.30×
1:1 Instagram square≈6.2″≈4.1″iPhone Duo · 2.30×
2.39:1 Movies (widescreen)≈6.7″≈6.8″tie
1.90:1 IMAX≈7.0″≈6.2″iPhone Duo · 1.29×
Screen specs
Screen7.6″6.9″
Resolution2670×18782868×1320
Aspect ratio1.42:12.17:1
TypeFoldablePhone
Year20262026