Palette.fm adds colour to black-and-white photographs. What separates it from the one-shot colourisers is the control: 21 filters to pick a starting point, then keyword adjustments to push individual elements toward the colours you actually want rather than accepting whatever the model guessed first.
Previews are free and unlimited, which is the right way round for this kind of tool. You can see what an archive photograph will look like before deciding whether it is worth paying for, and batch upload means a whole collection can be assessed in one pass rather than one file at a time.
Paid output runs to 5000 by 5000 pixels, at $49 for 75 credits or $72 a year. Free previews are capped at 500 pixels and watermarked, so the free tier evaluates the tool rather than producing anything usable. Worth stating plainly: colourisation invents plausible colour, it does not recover the real one, so the output is an interpretation and not a restoration.
