Palette

What it does

Instead of one automatic guess, it offers a set of colour filters and a text box where you describe what the colours should be — 'red brick house, green door' — and re-renders until it is right. That control is what separates it from the one-click colourisers, which always produce the same sepia-ish compromise. It is a preview-then-pay product.

Best for

• Colourising historic photographs
• Anyone who wants control over the result

Where it stops