Compare Fonts → Sans Serif → Open Sans vs Oxygen

Open 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. Open Sans takes more horizontal space.

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Open 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	Open Sans	Oxygen	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	53.5%	53.6%	0.0%
Cap heightHeight of capitals, as a share of the font size.	71.4%	72.2%	0.8%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.75	0.74	0.01
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	8.4%	8.5%	0.1%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.81	0.81	0.00
Average character widthMean lowercase advance. Higher takes more horizontal space.	52.2%	50.4%	1.8%

Where they diverge most

Average character width: Open Sans measures 52.2%, Oxygen measures 50.4%. Mean lowercase advance. Higher takes more horizontal space.
x-height to cap ratio: Open Sans measures 0.75, Oxygen measures 0.74. Proportion of lowercase to uppercase. Higher feels more modern and open.
Stroke weight: Open Sans measures 8.4%, Oxygen measures 8.5%. Measured thickness of a vertical stroke. Higher is heavier on the page.

At a glance

	Open Sans	Oxygen
Category	Sans Serif	Sans Serif
Weights	6	3
Variable axes	2	None
Language subsets	10	2
Designer	Steve Matteson	Vernon Adams