Compare Fonts → Monospace → IBM Plex Mono vs Courier Prime

IBM Plex Mono vs Courier Prime

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

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IBM Plex 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.

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.

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	IBM Plex Mono	Courier Prime	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	51.6%	45.1%	6.5%
Cap heightHeight of capitals, as a share of the font size.	69.8%	58.0%	11.8%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.74	0.78	0.04
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	8.5%	7.7%	0.8%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.81	0.94	0.13
Average character widthMean lowercase advance. Higher takes more horizontal space.	60.0%	60.0%	0.0%

Where they diverge most

x-height: IBM Plex Mono measures 51.6%, Courier Prime measures 45.1%. Height of lowercase letters, as a share of the font size. Higher reads larger at the same point size.
Stroke contrast: IBM Plex Mono measures 0.81, Courier Prime measures 0.94. Horizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.
Stroke weight: IBM Plex Mono measures 8.5%, Courier Prime measures 7.7%. Measured thickness of a vertical stroke. Higher is heavier on the page.

At a glance

	IBM Plex Mono	Courier Prime
Category	Monospace	Monospace
Weights	7	2
Variable axes	None	None
Language subsets	5	2
Designer	Mike Abbink	Alan Dague-Greene