Fonts like Instrument Serif
12 open fonts whose letters are closest to Instrument Serif, ranked by a glyph comparison. All free for commercial use.
Quick answer
The closest open font to Instrument Serif is Libre Caslon Condensed (similarity 75), then Oranienbaum and PT Sans Narrow. Libre Caslon Condensed is released under the SIL Open Font License 1.1 and is free for commercial use.
Side-by-side comparison
Top lookalikes compared at the same size Sphinx of black quartz, judge my vow
Sphinx of black quartz, judge my vow
Sphinx of black quartz, judge my vow
Sphinx of black quartz, judge my vow
Top lookalikes: licence permissions
Commercial rights side by sideLibre Caslon CondensedOFL-1.1
Commercial workAllowed
Logo or wordmarkAllowed
WebsiteAllowed, with conditions
App or gameAllowed, with conditions
Modify the fontAllowed, with conditions
Share the font fileAllowed, with conditions
Sell the font fileNot allowed
No credit needed in your workAllowed
OranienbaumOFL-1.1
Commercial workAllowed
Logo or wordmarkAllowed
WebsiteAllowed, with conditions
App or gameAllowed, with conditions
Modify the fontAllowed, with conditions
Share the font fileAllowed, with conditions
Sell the font fileNot allowed
No credit needed in your workAllowed
PT Sans NarrowOFL-1.1
Commercial workAllowed
Logo or wordmarkAllowed
WebsiteAllowed, with conditions
App or gameAllowed, with conditions
Modify the fontAllowed, with conditions
Share the font fileAllowed, with conditions
Sell the font fileNot allowed
No credit needed in your workAllowed
All 12 open lookalikes, ranked
Comparison based on letter shape and edge texture#1
Libre Caslon Condensed OFL-1.1
Similarity 75 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#2
Oranienbaum OFL-1.1
Similarity 63 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#3
PT Sans Narrow OFL-1.1
Similarity 59 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#4
Oswald OFL-1.1
Similarity 58 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#5
Special Gothic Condensed One OFL-1.1
Similarity 57 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#6
Sofia Sans Condensed OFL-1.1
Similarity 57 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#7
Cossette Titre OFL-1.1
Similarity 56 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#8
Asap Condensed OFL-1.1
Similarity 55 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#9
Barlow Condensed OFL-1.1
Similarity 55 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#10
Share OFL-1.1
Similarity 55 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#11
Ubuntu Condensed UFL-1.0
Similarity 54 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#12
Fira Sans Extra Condensed OFL-1.1
Similarity 54 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
Fonts made for other scripts with similar Latin letters
How the similarity score works
Each score is calculated by comparing 62 letters and digits (A-Z a-z 0-9) rendered at a 160px cap height on a 32×32 grid with 3px gaussian blur, combined with edge-orientation texture (weighted at 15%).
Scores are normalized on a standardized scale: 100 represents identical letterforms, and 0 represents an average pair among the 1571 fonts compared.