Is it the same color

Photograph a surface. Pick the exact spot you care about. Photograph another one later — a different wall, a different day, a tin of paint in a shop — and pick a spot in that one too. The app tells you how close they really are, as a plain percentage, not a guess by eye. WHAT IT MEASURES The colour difference is CIEDE2000 (ΔE00), the standard perceptual colour formula — not a naive RGB distance, which disagrees with what your eyes see on saturated colours. Alongside the percentage you get the plain-language verdict and the signed Lab deltas, so you can see how two colours differ: lighter, more muted, or a genuine shift in hue. A phone camera is not a spectrophotometer, and this app does not pretend otherwise. What it does about that: - Mark a white reference — a sheet of paper, a grey card — in both photos, and the app works out what each light was doing and takes it off both before…