Compare Fonts → Monospace → Courier Prime vs PT Mono

Courier Prime vs PT Mono

Both are monospace faces on Google Fonts. PT Mono has the larger x-height, so it looks bigger at the same size. PT Mono takes more horizontal space.

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Courier Prime

Handgloves & Quartz Jockeys

The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs, then ship it to 1,842 Grove Street by 9:30 AM.

Handgloves & Quartz Jockeys

The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs, then ship it to 1,842 Grove Street by 9:30 AM.

Measured from the font files. Heights and widths are shown as a share of the font size, so they compare directly at any point size.
Measurement	Courier Prime	PT Mono	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	45.1%	50.0%	4.9%
Cap heightHeight of capitals, as a share of the font size.	58.0%	70.0%	12.0%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.78	0.71	0.06
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	7.7%	8.3%	0.5%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.94	0.81	0.13
Average character widthMean lowercase advance. Higher takes more horizontal space.	60.0%	60.0%	0.0%

x-height: Courier Prime measures 45.1%, PT Mono measures 50.0%. Height of lowercase letters, as a share of the font size. Higher reads larger at the same point size.
Stroke contrast: Courier Prime measures 0.94, PT Mono measures 0.81. Horizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.
x-height to cap ratio: Courier Prime measures 0.78, PT Mono measures 0.71. Proportion of lowercase to uppercase. Higher feels more modern and open.