Compare Fonts → Sans Serif → Space Grotesk vs Rethink Sans

Space Grotesk vs Rethink Sans

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

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Space Grotesk

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.

Rethink 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.

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	Space Grotesk	Rethink Sans	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	48.6%	49.6%	1.0%
Cap heightHeight of capitals, as a share of the font size.	70.0%	70.0%	0.0%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.69	0.71	0.02
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	7.9%	8.5%	0.6%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.90	0.86	0.04
Average character widthMean lowercase advance. Higher takes more horizontal space.	55.6%	52.1%	3.5%

Where they diverge most

Average character width: Space Grotesk measures 55.6%, Rethink Sans measures 52.1%. Mean lowercase advance. Higher takes more horizontal space.
Stroke weight: Space Grotesk measures 7.9%, Rethink Sans measures 8.5%. Measured thickness of a vertical stroke. Higher is heavier on the page.
Stroke contrast: Space Grotesk measures 0.90, Rethink Sans measures 0.86. Horizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.

At a glance

	Space Grotesk	Rethink Sans
Category	Sans Serif	Sans Serif
Weights	5	5
Variable axes	1	1
Language subsets	3	2
Designer	Florian Karsten	Hans Thiessen