Compare Fonts → Sans Serif → Oxygen vs Asap

Oxygen vs Asap

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

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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.

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	Oxygen	Asap	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	53.6%	52.3%	1.3%
Cap heightHeight of capitals, as a share of the font size.	72.2%	70.0%	2.2%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.74	0.75	0.01
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	8.5%	8.8%	0.3%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.81	0.82	0.01
Average character widthMean lowercase advance. Higher takes more horizontal space.	50.4%	49.9%	0.5%

x-height: Oxygen measures 53.6%, Asap measures 52.3%. Height of lowercase letters, as a share of the font size. Higher reads larger at the same point size.
Stroke weight: Oxygen measures 8.5%, Asap measures 8.8%. Measured thickness of a vertical stroke. Higher is heavier on the page.
Average character width: Oxygen measures 50.4%, Asap measures 49.9%. Mean lowercase advance. Higher takes more horizontal space.