Compare Fonts → Monospace → Space Mono vs PT Mono

Space Mono 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. Space Mono takes more horizontal space.

Try your own text

Space Mono

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.

PT Mono

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 differences

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	Space Mono	PT Mono	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	49.6%	50.0%	0.4%
Cap heightHeight of capitals, as a share of the font size.	70.0%	70.0%	0.0%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.71	0.71	0.01
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	8.0%	8.3%	0.3%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.93	0.81	0.11
Average character widthMean lowercase advance. Higher takes more horizontal space.	61.2%	60.0%	1.2%

Where they diverge most

Stroke contrast: Space Mono measures 0.93, PT Mono measures 0.81. Horizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.
Average character width: Space Mono measures 61.2%, PT Mono measures 60.0%. Mean lowercase advance. Higher takes more horizontal space.
Stroke weight: Space Mono measures 8.0%, PT Mono measures 8.3%. Measured thickness of a vertical stroke. Higher is heavier on the page.

At a glance

	Space Mono	PT Mono
Category	Monospace	Monospace
Weights	2	1
Variable axes	None	None
Language subsets	3	4
Designer	Colophon Foundry	ParaType