Compare Fonts → Sans Serif → Roboto Flex vs Asap

Roboto Flex vs Asap

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

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Roboto Flex

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	Roboto Flex	Asap	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	51.4%	52.3%	0.9%
Cap heightHeight of capitals, as a share of the font size.	71.1%	70.0%	1.1%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.72	0.75	0.02
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	9.3%	8.8%	0.5%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.80	0.82	0.02
Average character widthMean lowercase advance. Higher takes more horizontal space.	49.5%	49.9%	0.5%

x-height: Roboto Flex measures 51.4%, 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: Roboto Flex measures 9.3%, Asap measures 8.8%. Measured thickness of a vertical stroke. Higher is heavier on the page.
x-height to cap ratio: Roboto Flex measures 0.72, Asap measures 0.75. Proportion of lowercase to uppercase. Higher feels more modern and open.