Geo Circle Open
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Serif · 1 style · 148 glyphs · Version 0.1.0
Harbor Slab is a serif font: typewriter-proportioned slab with round ends and bracketed feet. Best for Slab Serif designs.
Personal use: with Pro, Studio, or as one of 5 Font Pass picks ($4.99 once)Commercial license from $15/mo, yours to keep after your plan endsSee plans
Aa
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Test
Type the words you plan to use and adjust size, line height, and letter spacing. The preview uses the final font file.
The quick brown fox jumps over the lazy dog
Specimens
Rendered from the font files, without retouching.







About
Harbor Slab's lowercase x reaches 70.5% of the capital height, close to the 69.6% median for serif fonts, taller than 23 of the 39 other serif fonts. Ascenders on b, d, h, k and l line up with the capitals (100% of their height), and descenders on g, j, p, q and y drop 30.2% of the cap height below the baseline, deeper than 23 of the 39 other serif fonts. Harbor Slab runs 9.5% narrower than the median for serif fonts: an average lowercase letter, spacing included, is 77.7% as wide as the capitals are tall (an average capital, 94.2%). The o is close to a circle, 1.03 times as wide as it is tall, and W is the widest capital, at 1.28 times the width of H. Round letters overshoot: O rises 3.2% of the cap height above H and dips 1.6% below the baseline.
The letters stand upright, with no measurable slant. Vertical stems measure 11.4% of the cap height, lighter than 31 of the 35 other serif fonts. Ink covers 32.1% of each lowercase letter's box (its advance width by the cap height), darker than 20 of the 39 other serif fonts. Strokes keep one thickness in every direction: the sides of o and O measure the same as their tops and bottoms.
Its 148 characters include 105 Latin letters, plus 43 figures, punctuation marks and symbols; 53 of the Latin letters are accented or special forms beyond A to Z. The word space measures 35.3% of the cap height, and the blank space either side of a lowercase letter takes up 7.7% of its width. Spacing is adjusted with 272 kerning pairs, more than 30 of the 39 other serif fonts. The tightest of them is AY, which closes up by 30.9% of the cap height. The figures have different widths, so columns of numbers set in Harbor Slab will not line up exactly.
9 other library fonts share Harbor Slab's underlying letter structure. Compared with Harbor Slab, Pennant Slab rings each letter with an outline, sets 12% wider and puts down 36% more ink. Memo Italic Mono leans about 9°, sets 11% wider and puts down 41% less ink. Ledger Slab puts down 21% less ink.
Measured from the version 0.1.0 font file. Comparisons are with the 314 library fonts measured on October 2, 2026, 40 of them serif fonts.
Characters
Includes all 95 printable Basic Latin characters and 148 glyphs in total.
Verified language coverage: English (Basic Latin)
Download
Choose the license that matches your project before downloading.
This font is part of the Pro library: it downloads with Pro or Studio, or as one of the five picks of a Font Pass.
Client work, products and redistribution need a commercial license. Library fonts include it with Pro or Studio; fonts you make include it when you make them on Pro, Studio or a Font Pass.
TTF · OTF · WOFF · WOFF2
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Pairings
A different structure keeps a pairing readable: set one font for headings and the other for text. Test both with your own words.
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