Typography

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The typography of KaiOS provides a great reading experience, conveys hierarchy, and facilitates understanding.

Open Sans is the standard typeface on KaiOS. It provides high legibility and is well suited for high or low density displays.Noto Sans is the typeface to support other languages with harmonious look and feel.

Typefaces

Use font weight and size to emphasize important information in your app.

Open Sans font weights

KaiOS picks out 4 weights of Open Sans including Light, Regular, Semi-bold, and Bold.

OPEN SANS LIGHT
The Open Sans is optimized for legibility across print, web, and mobile interfaces.

OPEN SANS REGULAR
The Open Sans is optimized for legibility across print, web, and mobile interfaces.

OPEN SANS SEMIBOLD
The Open Sans is optimized for legibility across print, web, and mobile interfaces.

OPEN SANS BOLD
The Open Sans is optimized for legibility across print, web, and mobile interfaces.

Noto Sans

KaiOS picks out 2 weights of Noto Sans including Regular and Bold.

NOTO SANS REGULAR
The Noto Sans is optimized for legibility across print, web, and mobile interfaces.

NOTO SANS BOLD
The Noto Sans is optimized for legibility across print, web, and mobile interfaces.

Font Sizes

KaiOS uses a specific set of font sizes to balance content priority and readability.

This is a list of the most common styles and the basics you may need. There are 11 default styles calculated for a 140 ppi screen, which is a QVGA resolution at 2.8 inch display. If you’re working with a different resolution you will need to convert the unit based on your device resolution.

Label	Description	Typeface	Pixel
H1	Header text	Regular/400	17
H2	Header of body text	Semibold/600	17
H3	Tab text	Regular/400	14
H4	Separator text	Regular/400	14
H5	Software key text	Semibold/600	14
P.PRI	Primary text	Regular/400	17
P.SEC	Secondary text	Regular/400	14
P.THI	Tertiary text	Regular/400	12
P, UL	Body text	Regular/400	17
P.LINK	Hyperlink text	Bold/700	17
P.BTN	Button text	Regular/400	17