What font does Slack use?
Slack has been part of Salesforce since 2021, and its marketing site now wears the parent company’s typography: a bold geometric display face over a quiet, readable sans serif.
Short answer: Slack’s website uses two Salesforce brand typefaces: Salesforce Avant Garde for headlines and Salesforce Sans for body and interface text. Both are served from Slack’s own CDN.
Salesforce Sans
Self-hosted77.3%- CSS name
Salesforce-Sans- Weights
- 300, 400, 600, 700
- Sizes
- 22.6px · 18px · 16px · 14.4px · 14px · 12px
- Served from
- a.slack-edge.com
Salesforce Avant Garde
Self-hosted22.7%- CSS name
Salesforce-Avant-Garde- Weights
- 700
- Sizes
- 64px · 58px · 50.4px · 32px · 24px · 22px
- Served from
- a.slack-edge.com
Sizes, weights and spacing by role
These are computed values from the live page, which is what the Font Inspector panel shows when you click each element.
| Role | Font | Size | Weight | Line height | Letter spacing |
|---|---|---|---|---|---|
| Headline | Salesforce Avant Garde | 64px | 700 | 1.12 | -0.012em |
| Subheading | Salesforce Avant Garde | 50px | 700 | 1.12 | -0.012em |
| Navigation | Salesforce Sans | 15px | 700 | 1.56 | -0.001em |
| Small text | Salesforce Sans | 16px | 400 | normal | normal |
The main font stack in the CSS:
font-family: Salesforce-Sans, system-ui, -apple-system, blinkmacsystemfont, "Segoe UI", roboto, "Helvetica Neue", arial, "Noto Sans", sans-serif;- A classic two-font system: the display face covers about a quarter of the text, and only in bold.
- The CSS also declares dedicated fonts for Chinese, Japanese and Korean text.
- Both stacks fall back to a full system font stack, so text stays readable if the web fonts fail.
Check any site yourself in one click.
Sites change their type without notice. Font Inspector shows the rendered font, size, weight and spacing of any text on slack.com or anywhere else, and lists every font on the page. Free, no account.
About the fonts, and whether you can use them
Salesforce Sans
Salesforce’s corporate sans serif, a clean and neutral design used across the company’s products and sites. Here it sets paragraphs, navigation and buttons.
Can you use it? Salesforce Sans is a proprietary brand typeface and is not available to license. Open source sans serifs such as Source Sans 3 and Open Sans give a similar, friendly reading texture.
On Google Fonts: Source Sans 3, Open Sans.
Salesforce Avant Garde
A Salesforce-branded cut of Avant Garde Gothic, the geometric classic drawn by Herb Lubalin and Tom Carnase in 1970, with its perfectly round letters.
Can you use it? The Salesforce version is proprietary. ITC Avant Garde Gothic itself is a commercial typeface. Outfit and Jost are free geometric fonts with the same round construction.
Finding a font does not license it. More in how to get a font you found, legally.
Get a similar look with a free font
This starter uses Source Sans 3, which is open source, with the sizes and spacing measured above. It is an approximation, not a copy of Slack’s brand typeface.
/* Approximates the Slack look with a free font */
body {
font-family: "Source Sans 3", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
h1 {
font-size: 4rem; /* 64px */
font-weight: 700;
line-height: 1.12;
letter-spacing: -0.012em;
}How we checked
We opened slack.com in Chrome on September 20, 2026 and read the computed styles of its visible text: the declared font stack, the font actually rendered, and how much of the page’s text each family sets. That is the same data the Font Inspector extension shows under Fonts on this page. We re-check these pages periodically, and the date above shows the last inspection.
Slack and its typefaces are trademarks of their respective owners. Font Inspector is not affiliated with Slack.
Questions & answers
What font does Slack use on its website?+
Slack’s website uses two Salesforce brand typefaces: Salesforce Avant Garde for headlines and Salesforce Sans for body and interface text. Both are served from Slack’s own CDN.
Can I use the Slack font?+
Salesforce Sans is a proprietary brand typeface and is not available to license. Open source sans serifs such as Source Sans 3 and Open Sans give a similar, friendly reading texture.
What is a free font similar to Salesforce Sans?+
Source Sans 3 and Open Sans are free on Google Fonts and give a similar feel. No free font is an exact match, so compare it with your own text first.
How can I check what font Slack uses myself?+
Open slack.com, then click any text with the Font Inspector extension, or right-click, choose Inspect and look at Rendered Fonts in the Computed tab. Sites change their typography, so checking the live page is the only way to be sure.