react.dev
React
- Body text
- Optimistic
- Headings
- Optimistic
Last checked Sep 23, 2026. Run this site and want it removed? Request an opt-out.
All text on the page
- Optimistic80%
- Source Code Pro16%
- Optimistic4.2%
Loading
- Served by
- Self-hosted
- Font files
- 322 KB
- Preloaded fonts
- 9
- Families declared
- 3
- Platform
- Next.js
- Font hosts
- react.dev
History
Each row is a stretch of time where the fonts stayed the same. Rows marked Web archive are estimates from saved copies of the page and less reliable than our own crawl.
- Sep 23, 2026Our crawlOptimistic
- May 15, 2023 to May 15, 2026Web archivesystem-ui
Every font face the page declares (3)
| Family as declared | Weights | Variable | Used |
|---|---|---|---|
| Source Code Pro | 400, 700 | No | Yes |
| Optimistic Display | 500, 600, 700 | No | Yes |
| Optimistic Text | 400, 500, 700 | No | Yes |