This study evaluated the validity of four portable devices: gFlight, Enode, MyJump2, OptoJump, and the ForceDecks flight time method against the Vald ForceDecks impulse-momentum method for measuring countermovement jump (CMJ) height. Thirty collegiate athletes (21 males, 9 females) performed five standardized CMJs without arm swing, with data collected across devices. Concurrent validity was assessed using Bland-Altman plots, one-way ANOVA, and correlations, including subgroup analyses by sex and propulsive peak power. MyJump2 and OptoJump showed the smallest biases (0.90 cm and 1.15 cm, respectively), followed by ForceDecks flight time (1.61 cm). Enode and gFlight overestimated jump height (7.82 cm and 4.08 cm). MyJump2 performed best in low peak power and female sub-groups, while OptoJump and MyJump2 were most accurate in high peak power and male sub-groups. Overall, MyJump2 and OptoJump provide valid, practical alternatives to force plates, whereas smaller optical sensors and accelerometers may need correction equations.
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