When comparing Tone Syntax vs Leuven, the Slant community recommends Leuven for most people. In the question“What are the best color themes for text editors?” Leuven is ranked 22nd while Tone Syntax is ranked 42nd. The most important reason people chose Leuven is:
People with astigmatism prefer the bright white background since the extra light causes your pupils to contract, which makes your focus sharper.
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Pros
Pro Limited colour palette
Very few colours - I make it even fewer by configuring two of the three colours to be the same.
Pro Customizable - you can set the colours to your liking.
Pro Helpful for people with astigmatism
People with astigmatism prefer the bright white background since the extra light causes your pupils to contract, which makes your focus sharper.
Pro Helpful for people with deuteranomaly
Leuven is a high-contrast theme preferring blue hues to red ones which makes it easier for people with deuteranomaly (most common form of red-green blindness) to distinguish different syntactical elements.
Cons
Con Default background colour is not dark enough (subjective)
Con Only available for Atom.io
Only supported by the Atom editor
Con May cause eye strain
People with blue-light sensitivity may prefer a dark theme.