On: Programming Fonts – Test Drive

[heyjudy]

I've tried dozens.

Monaco or Source Code Pro

You also have to try them in your terminal or editor, because on the web isn't the same experience.

[Jaruzel → heyjudy]

Browsers tend to use their own inbuilt font rendering code, which can be different from the OS. I know for a fact that some of the fonts shown at app.programmingfonts.org do not render that well inside apps on Windows 10.