Violet Shift

Violet Shift is the precision bench instrument for anodic colouring of reactive metals. Titanium, niobium, tantalum, zirconium — each metal grows a transparent oxide film at a controlled voltage, and that film's thickness determines the colour it reflects. Violet Shift calculates every colour from the physics of thin-film interference, with no hand-picked values anywhere. Point your camera at finished work, drop five sampling reticles on the surface, and the app inverts the colour back to the voltage that produced it — returning film thickness, interference order, and a delta E reading against your target in seconds. The colour Bench is your live instrument panel. Drag the voltage dial and watch the coupon plate render the exact interference colour that voltage produces on your chosen metal and surface prep. The Ladder is a physics-derived atlas of 26 named bands — Bronze, Cobalt, Royal Purple, Peacock, Magenta, and more — spanning three interference orders across six metals. The Bath screen keeps electrolyte recipes and surface prep notes a tap away. The Kit and Faults screens give you a reference for essential equipment and nine common anodising defects, each with symptom, cause, and fix. Your work lives in Pieces. Each piece carries a target colour, a photo of the finished part, and a complete run log. Save a match result to a piece and Violet Shift updates its delta E verdict — OK, Close, or Off — automatically. The Stats dashboard turns your run history into a delta E trend chart, metal usage rings, a finish distribution chart, and a monthly fault grid, so you can see whether your technique is tightening over time. No account required. No cloud sync. No in-app purchases. Every calculation runs on-device from the physics up — the same thin-film optics that govern the colour whether or not you have a signal in the workshop.