Physical Dimensions & Thickness: The Retroid Pocket 4 Pro has a horizontal bar chassis measuring 184.8 × 82.6 × 15.8 mm, while the Retroid Pocket 5 uses a horizontal bar chassis measuring 199.2 × 78.5 × 15.6 mm. In width, the Retroid Pocket 4 Pro is 14.4 mm (7.2%) narrower than the Retroid Pocket 5. In height, the Retroid Pocket 4 Pro is 4.1 mm (5.2%) taller than the Retroid Pocket 5. In chassis thickness (depth), the Retroid Pocket 4 Pro is 0.2 mm (1.3%) thicker than the Retroid Pocket 5 (15.8 mm vs 15.6 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the Retroid Pocket 4 Pro occupies 15,264 mm² (152.6 cm²), compared to 15,637 mm² (156.4 cm²) for the Retroid Pocket 5—a footprint difference of 373 mm² (2.4%). On the scale, the Retroid Pocket 4 Pro weighs 261g versus 280g for the Retroid Pocket 5, representing a 19g (6.8%) weight difference (Retroid Pocket 4 Pro is lighter).
4:3 vs 16:9 Effective Viewable Screen Size: For classic 4:3 retro games (PS1, SNES, N64, Dreamcast), the Retroid Pocket 4 Pro's 4.7" (16:9) panel yields a 3.84" effective diagonal (75% active screen area with vertical pillarbox bars on the sides (native 16:9)), while the Retroid Pocket 5's 5.5" (16:9) panel yields a 4.49" effective diagonal (75% active screen area with vertical pillarbox bars on the sides (native 16:9)). This gives the Retroid Pocket 5 a 0.65" larger active 4:3 diagonal (36.9% more active display area). For 16:9 widescreen content (PSP, Switch, streaming), the Retroid Pocket 4 Pro delivers a 4.7" effective diagonal (100% screen usage) versus 5.5" (100% screen usage) on the Retroid Pocket 5, making the Retroid Pocket 5 larger by 0.8" (+36.9% active 16:9 area).
