Kaisei Opti

Font-Kai · Serif · 3 styles · ✓ OFL

Download Kaisei Opti

Size Tracking Ink Paper Click the specimen to type your own

The quick brown fox jumps over the lazy dog

Styles and weights

Regular 400 Pack my box with five dozen liquor jugs

Medium 500 Pack my box with five dozen liquor jugs

Bold 700 Pack my box with five dozen liquor jugs

Web preview shows the Regular cut. The download includes every listed weight.

Character set

ABCDEFGHIJKLMNOPQRSTUVWXYZ

abcdefghijklmnopqrstuvwxyz

0123456789

.,;:!?'"()[]{}<>@#$%&*+-=/\_

Subsets included: cyrillic, japanese, latin, latin-ext

About Kaisei Opti

Kaisei Opti is a serif typeface designed by Font-Kai, published as an open-source font in 2021. The family ships 3 styles.

Language support extends beyond basic Latin to cyrillic, japanese, latin-ext. Because Kaisei Opti is licensed under the SIL Open Font License 1.1, you can use it in commercial work without buying anything or crediting anyone in the design itself.

Licence

✓ Kaisei Opti is free for commercial use

SIL Open Font License 1.1, verified by DaFontFonts

The SIL Open Font License is the most common open font licence. It permits use in any commercial or personal project, print, logos, websites, apps, products for sale, and allows modification and redistribution. The only real restrictions: you may not sell the font files by themselves, and if you modify the font you must rename it (if it uses a Reserved Font Name) and keep it under the OFL.

You can

Commercial use in any project, client work, products for sale, advertising
Logos and brand identities (including trademarked logos)
Web embedding (@font-face) and app embedding
Print: books, packaging, merchandise, print-on-demand
Modifying the font and redistributing modified versions (under the OFL, renamed if a Reserved Font Name applies)

Keep in mind

Selling the font files by themselves (bundling with software or designs is fine)
Modified versions must stay under the OFL and drop any Reserved Font Name

How we verify licences

Get the files

Desktop and print: The full family, 3 styles, from the official source. Download Kaisei Opti
Web embedding: Self-host the woff2 for the fastest, most private setup.

@font-face { font-family: 'Kaisei Opti'; src: url('kaisei-opti.woff2') format('woff2'); font-weight: 400; font-display: swap; }

Get woff2

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Questions

Is Kaisei Opti free for commercial use?

Yes. Kaisei Opti is licensed under the SIL Open Font License 1.1, which permits commercial use in client work, products for sale, advertising, web and app embedding. There are no royalties and no attribution requirement in your designs.

Can I use Kaisei Opti in a logo?

Yes. The SIL Open Font License 1.1 allows logo use, including logos you register as trademarks. The licence covers the font software; your logo design remains entirely yours.

Do I need to credit Font-Kai when using Kaisei Opti?

No. Attribution is not required in designs, websites, or products. The only rule that ever applies: if you redistribute the font files themselves, keep the licence file with them.

How many styles does Kaisei Opti have?

Kaisei Opti includes 3 styles: Regular, Medium, Bold.

What languages does Kaisei Opti support?

Character sets included: cyrillic, japanese, latin, latin-ext. Check the character-set preview on this page before committing to a multilingual project.