Detection limits for the brightest target observable without saturation with JWST NIRISS. Solid lines show detection limits for T_B at P_FA = 1% and P_DET = 68% applied to the image with the greatest possible dynamic range, with 20 min total integration time. For the brightest images, the kernel method with the test T_B ideally allows detection of contrasts up to 10⁵ beyond 500 mas. The dashed orange line represents detection limits in the presence of a 16 nm wavefront drift.