I've been working on creating a "free" version of StitchSketch - it will be called "StitchSketch LE".
The purpose of this version is to be able to try all the functionality of StitchSketch before buying it.
The limitations of LE version are as follows:
Max chart size is 64 x 64.
Only generic color palette is available.
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You can try it for free, and if you like it, you can buy a full version.
It's coming soon.