Fonts like Kaisei Opti
12 open fonts whose letters are closest to Kaisei Opti, ranked by a glyph comparison. All free for commercial use.
Quick answer
The closest open font to Kaisei Opti is Frank Ruhl Libre (similarity 75), then STIX Two Text and Lora. Frank Ruhl Libre 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 sideFrank Ruhl LibreOFL-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
STIX Two TextOFL-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
LoraOFL-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
Frank Ruhl Libre OFL-1.1
Similarity 75 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#2
STIX Two Text OFL-1.1
Similarity 74 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#3
Lora OFL-1.1
Similarity 71 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#4
Noto Serif JP OFL-1.1
Similarity 71 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#5
Source Serif 4 OFL-1.1
Similarity 70 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#6
Charis SIL OFL-1.1
Similarity 70 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#7
Libre Caslon Text OFL-1.1
Similarity 70 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#8
Brygada 1918 OFL-1.1
Similarity 70 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#9
Wittgenstein OFL-1.1
Similarity 70 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#10
Hedvig Letters Serif OFL-1.1
Similarity 70 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#11
Judson OFL-1.1
Similarity 69 — 100 = identical letters, 0 = an average pair
Sphinx of black quartz, judge my vow
#12
Libre Baskerville OFL-1.1
Similarity 69 — 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.