Dark Theme for PLCnext Engineer

[suprunchuk]

Add an official dark theme for PLCnext Engineer.

Rationale:

• Reduced eye strain during long engineering sessions
• Better usability in low-light industrial environments
• Consistency with modern development tools that already provide dark mode
• Improved visual focus and contrast when working with large projects

Requested functionality:

• Full dark UI theme (project tree, editors, dialogs, toolbars)
• Proper syntax highlighting adapted for dark background
• Consistent styling across all integrated tools

A native dark theme would improve ergonomics and align PLCnext Engineer with current engineering software standards.

[martin-plcnext]

This topic has been discussed over the years, here:

Change the color theme in PLCnext Engineer

Is it possible to change the color theme in PLCnext Engineer? I want to change it to something that is much darker, and easier on the eyes, than the default color scheme. Thanks, -Jon

I am not aware of where this feature currently is on the priority list for the PLCnext Engineer developers.

[suprunchuk]

@martin-plcnext

This topic has been discussed over the years, here:

I understand. Thank you for your reply. We’re still waiting for the dark theme, it’s really important.

[nyxdabirb]

I keep my PLC Next in a VM and set up the windows color filter to inverted and just toggle it as I go. an officially made dark mode would be so dang nice like CodeSYS has. For now inverted colors is a good work around to keep your retinas from burning out lol.