Compare Fonts → Sans Serif → IBM Plex Sans vs Oxygen

IBM Plex Sans vs Oxygen

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

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IBM Plex Sans

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.

Oxygen

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 Sans	Oxygen	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	51.6%	53.6%	2.0%
Cap heightHeight of capitals, as a share of the font size.	69.8%	72.2%	2.4%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.74	0.74	0.00
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	8.6%	8.5%	0.1%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.83	0.81	0.02
Average character widthMean lowercase advance. Higher takes more horizontal space.	50.5%	50.4%	0.1%

Where they diverge most

x-height: IBM Plex Sans measures 51.6%, Oxygen measures 53.6%. Height of lowercase letters, as a share of the font size. Higher reads larger at the same point size.
Stroke contrast: IBM Plex Sans measures 0.83, Oxygen measures 0.81. Horizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.
Stroke weight: IBM Plex Sans measures 8.6%, Oxygen measures 8.5%. Measured thickness of a vertical stroke. Higher is heavier on the page.

At a glance

	IBM Plex Sans	Oxygen
Category	Sans Serif	Sans Serif
Weights	7	3
Variable axes	2	None
Language subsets	6	2
Designer	Mike Abbink	Vernon Adams