Compare Fonts → Serif → Roboto Slab vs Bitter

Roboto Slab vs Bitter

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

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Roboto Slab

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.

Bitter

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	Roboto Slab	Bitter	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	52.8%	52.8%	0.0%
Cap heightHeight of capitals, as a share of the font size.	71.1%	69.8%	1.3%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.74	0.76	0.01
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	9.6%	8.4%	1.2%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.78	0.70	0.08
Average character widthMean lowercase advance. Higher takes more horizontal space.	54.5%	53.3%	1.2%

Where they diverge most

Stroke weight: Roboto Slab measures 9.6%, Bitter measures 8.4%. Measured thickness of a vertical stroke. Higher is heavier on the page.
Stroke contrast: Roboto Slab measures 0.78, Bitter measures 0.70. Horizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.
Average character width: Roboto Slab measures 54.5%, Bitter measures 53.3%. Mean lowercase advance. Higher takes more horizontal space.

At a glance

	Roboto Slab	Bitter
Category	Serif	Serif
Weights	9	9
Variable axes	1	1
Language subsets	7	5
Designer	Christian Robertson	Sol Matas