# UnoCSS, release history and use on real websites.

An atomic CSS engine by Anthony Fu that generates only the utility classes you use. It is compatible with Tailwind classes but faster and configurable through presets.

- **Status:** Modern. Actively developed.
- **Category:** [JS/CSS Frameworks](https://be1st.ai/technologies/framework)
- **First release:** 2021
- **License:** MIT
- **Latest version:** 66.12.0 (26 Oct 2026)
- **Official website:** https://unocss.dev
- **Documentation:** https://unocss.dev/guide/
- **GitHub:** https://github.com/unocss/unocss
- **Page:** https://be1st.ai/technologies/framework/unocss

## UnoCSS on audited websites

197 of the 16,845 websites audited by be1st run UnoCSS (1.2%). That ranks it #16 of the 35 technologies in JS/CSS Frameworks we have seen in audits.

### Websites running UnoCSS vs all websites

- **Web score:** 67 (all websites 72)
- **SEO:** 79 (all websites 79)
- **Security:** 43 (all websites 59)
- **Performance:** 65 (all websites 72)
- **AI Readiness:** 30 (all websites 31)

### Most used in JS/CSS Frameworks

1. [Tailwind CSS](https://be1st.ai/technologies/framework/tailwind-css): 34% (5,653)
2. [jQuery](https://be1st.ai/technologies/framework/jquery): 29% (4,883)
3. [Next.js](https://be1st.ai/technologies/framework/next-js): 23% (3,836)
4. [React](https://be1st.ai/technologies/framework/react): 22% (3,626)
5. [Bootstrap](https://be1st.ai/technologies/framework/bootstrap): 13% (2,198)
6. [PHP](https://be1st.ai/technologies/framework/php): 3.0% (502)
7. [Lit](https://be1st.ai/technologies/framework/lit): 2.9% (487)
8. [Astro](https://be1st.ai/technologies/framework/astro): 2.4% (405)
9. [Vue.js](https://be1st.ai/technologies/framework/vue-js): 2.2% (373)
10. [Alpine.js](https://be1st.ai/technologies/framework/alpine-js): 2.0% (341)

The number for React counts only websites where Tech Stack detects it directly, not websites built with Next.js, Gatsby, and Remix, which run it too. The number for Vue.js counts only websites where Tech Stack detects it directly, not websites built with Nuxt, which run it too.

## UnoCSS versions and release history

3 release lines since 2021, as listed by the npm registry. The latest version is 66.12.0, released 26 Oct 2026.

| Version | Released | Latest release | Releases |
| --- | --- | --- | --- |
| 66 | 18 Feb 2025 | 66.12.0 (26 Oct 2026) | 53 |
| 65 | 10 Jan 2025 | 65.5.0 (15 Feb 2025) | 4 |
| 0.x (before 1.0) | 26 Oct 2021 | 0.65.4 (8 Jan 2025) | 378 |

Sources: [npm registry, package unocss](https://www.npmjs.com/package/unocss), checked 8 Nov 2026.

## Other technologies in JS/CSS Frameworks

- [TanStack Start](https://be1st.ai/technologies/framework/tanstack-start): 1.9% of websites
- [Nette](https://be1st.ai/technologies/framework/nette): 1.8% of websites
- [Nuxt](https://be1st.ai/technologies/framework/nuxt): 1.5% of websites
- [Angular](https://be1st.ai/technologies/framework/angular): 1.2% of websites
- [Preact](https://be1st.ai/technologies/framework/preact): 1.2% of websites
- [Express](https://be1st.ai/technologies/framework/express): 1.1% of websites
- [SvelteKit](https://be1st.ai/technologies/framework/sveltekit): 1.1% of websites
- [ASP.NET](https://be1st.ai/technologies/framework/asp-net): 1.0% of websites
- [Django](https://be1st.ai/technologies/framework/django): <1% of websites
- [HTMX](https://be1st.ai/technologies/framework/htmx): <1% of websites
- [Turbo (Hotwire)](https://be1st.ai/technologies/framework/turbo): <1% of websites
- [Bulma](https://be1st.ai/technologies/framework/bulma): <1% of websites

[All 38 in JS/CSS Frameworks](https://be1st.ai/technologies/framework)

## Questions about UnoCSS

### What is UnoCSS?

An atomic CSS engine by Anthony Fu that generates only the utility classes you use. It is compatible with Tailwind classes but faster and configurable through presets. The be1st catalog lists UnoCSS under JS/CSS Frameworks. License of UnoCSS: MIT.

### What is the latest version of UnoCSS?

The latest version of UnoCSS is 66.12.0, released 26 Oct 2026 (source: npm registry, package unocss).

### How many websites use UnoCSS?

197 of the 16,845 websites audited by be1st run UnoCSS (1.2%), as of 8 Nov 2026.

### When was UnoCSS first released?

UnoCSS was first released in 2021.

### Is UnoCSS still a modern choice?

Yes. UnoCSS counts as a modern technology. Actively developed.

### What are the alternatives to UnoCSS?

Technologies that do the same job as UnoCSS include Tailwind CSS.

Numbers: latest audit of each of 16,845 websites audited by be1st, as of 8 Nov 2026.