PatternSpace vs QUBYX PerfectEPD

PatternSpace is a macOS app for generating test patterns used in display calibration. It creates SDR and HDR patches, pattern grids, clipping checks, gamma tools, and color swatches. Its library contains more than 100 GPU-rendered patterns in Color, Checks, Geometry, Swatch, Gamma, and Clipping categories. Rendering uses a Metal EDR pipeline with up to 16-bit-per-channel output and patches locked to display refresh timing. It works with connected internal or external displays and requires macOS 15.6 or later on Apple Silicon or Intel Macs. The free plan includes 100+ patterns and 14 SDR reference presets; PatternSpace Pro costs $39.99, paid once and adds calibration integrations, unlimited Remote rendering, advanced HDR, and LUT and ICC export. DeckLink SDI Output is a separate $39.99, paid once and requires compatible Blackmagic hardware and Desktop Video 16.4.x. PatternSpace supplies patches but does not measure or automatically correct a display; display accuracy requires measurement hardware.

QUBYX PerfectEPD has no write-up on Specifiction yet; its figures are above.