What is measured, what is proven in use, and what isn't yet. Updated with every release; the numbers come from the repository's own data.

Version 0.2 (October 2026). Usable for prototypes and small apps built with an AI agent. The syntax may still change before 1.0; every change is listed in the changelog with what to write instead.

Measured #

• Cost: over 50 tasks, three models and five stacks, ArtScript cost 50% less per working result than React + TypeScript with Claude Sonnet 5.5, 45% less with Opus 5.5 and 40% less with Haiku 4.5, and less than Svelte, Vue and Solid with each. Sonnet and Opus solved 100% of the tasks; Haiku 90% (86–89% in the other stacks). Raw data and method: Benchmarks.
• Performance: in js-framework-benchmark's own harness (run locally), within the group of Solid, Svelte and Vue on every operation; apps ship 5–20 KB of JavaScript. Submitted to the official benchmark.
• Tests: 215 in CI, covering the compiler, the runtime, the server, the dev tools and every example and guide on this site.

Proven in use #

• Three apps built by AI agents with the published package and only the spec: a shop, a backoffice and a landing page. Every bug they found is fixed.
• This website is an ArtScript app.
• The three apps run as static demos (their backend in your browser). No ArtScript server has run in production with real users yet.

Not yet #

• Security audit. The server has CSRF protection, rate limits, security headers, hashed passwords and sessions that expire, and the security policy explains what apps get by default. Nobody outside the project has audited it. Don't put other people's sensitive data in an ArtScript app before that happens.
• Frozen syntax. Planned for 0.3. Until then, a release can change the language; art fmt and the changelog tell what to write instead.
• Small models. With Haiku 4.5, one task in ten needed a human. Use Sonnet or Opus for real work.
• Database: SQLite only, one process. Enough for small and medium apps; no Postgres yet.
• Known gaps: prerendered pages are replaced, not hydrated, when the app loads (a brief flash); server functions aren't transactional; with api users: User login, any signed-in user can list every account (being decided); no OAuth or email in the static demo mode.
• One maintainer. Issues are answered, but not within hours.

How to help #

Open an issue with a .art file that shows the problem, or tell us what your agent got wrong and what it wrote: that's how most fixes here started.