No specific info about version 17.1. Please visit the main page of Stamp Analyser on Mac Informer.
It checks foreground & background colour combinations.
It provides a very nice and useful collection of stamps for Tux Paint software.
PDF Watermarker - Let you easily watermark your PDF.
Determine the contrast ratio of two colors by using an eyedrop tool.
LignUp Stamps Multi Collector- organize your stamp collection.