Physical Dimensions & Thickness: The Retroid Pocket 4 Pro has a horizontal bar chassis measuring 184.8 × 82.6 × 15.8 mm, while the TrimUI Smart Pro uses a horizontal bar chassis measuring 188 × 80 × 17 mm. In width, the Retroid Pocket 4 Pro is 3.2 mm (1.7%) narrower than the TrimUI Smart Pro. In height, the Retroid Pocket 4 Pro is 2.6 mm (3.2%) taller than the TrimUI Smart Pro. In chassis thickness (depth), the Retroid Pocket 4 Pro is 1.2 mm (7.1%) slimmer than the TrimUI Smart Pro (15.8 mm vs 17 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the Retroid Pocket 4 Pro occupies 15,264 mm² (152.6 cm²), compared to 15,040 mm² (150.4 cm²) for the TrimUI Smart Pro—a footprint difference of 224 mm² (1.5%). On the scale, the Retroid Pocket 4 Pro weighs 261g versus 231g for the TrimUI Smart Pro, representing a 30g (13%) weight difference (TrimUI Smart 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 TrimUI Smart Pro's 4.96" (16:9) panel yields a 4.05" effective diagonal (75% active screen area with vertical pillarbox bars on the sides (native 16:9)). This gives the TrimUI Smart Pro a 0.21" larger active 4:3 diagonal (11.4% 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 4.96" (100% screen usage) on the TrimUI Smart Pro, making the TrimUI Smart Pro larger by 0.26" (+11.4% active 16:9 area).
