Tested with Claude Opus 5.5 · isolated runs · no memory

Same prompt. Same model. One skill.

premium-saas-web is an open-source Agent Skill that makes Claude Code, Codex, Cursor and Antigravity build SaaS websites that look like top-selling templates. Drag the sliders and compare.

See before / after Made by Vantle

Before / after

Four one-line prompts. No style instructions.

Left of the handle: plain Claude Opus 5.5. Right: the same model with the skill. The prompts were written in Hungarian, so the pages were generated in Hungarian and then translated to English for this demo (text only, nothing re-generated). Use the tabs under each prompt to open the live pages and see the motion.

Benchmark · Claude Opus 5.5

Measured, not vibes. Including the trade-offs.

98% / 75%

automated quality checks passed, with vs. without the skill

+22.5 pts

tokens on :root, glows, hairlines, scroll motion, reduced-motion, no lorem

~11 min

per page with the skill (vs ~2.3 min). It plans, builds, then reviews itself in a browser.

~$2.70

API cost per page with the skill (vs ~$0.70). Richer pages cost more tokens.

Method, scoring script and raw results: github.com/MiddleSugar7000/premium-saas-web-skill/benchmark

Install

One folder. Every agent.

$ npx skills add MiddleSugar7000/premium-saas-web-skill

Claude Code

~/.claude/skills/Guide →

OpenAI Codex

~/.codex/skills/Guide →

Cursor

~/.cursor/skills/Guide →

Antigravity

~/.gemini/antigravity/skills/Guide →
Independent design & development studio

Need it built for real? Work with Vantle.

This skill comes from Vantle. We turn what you're building into a brand people remember, a website they understand, and a product they can use: design and engineering in one team, from the first sketch to launch.

Landing pageCustom design, 3D and motion, SEO and GEO
2–4 weeks
SaaS productAuth, Postgres, dashboard, payments, AI features
6–12 weeks
First replyScope and feasibility, in writing
1 business day
Start a project See the work hello@vantle.studio
vantle.studio: A good idea. In full focus.

FAQ

Questions

What is premium-saas-web?

An open-source Agent Skill: a folder with a SKILL.md file and three reference files. It teaches AI coding agents to build premium SaaS, AI-product, agency and portfolio websites using 4 design directions, 18 copy-ready CSS/HTML recipes and a GSAP + Lenis motion system, all measured from top-selling ThemeForest templates.

Which AI agents does it work with?

Claude Code, OpenAI Codex, Cursor and Google Antigravity, plus any agent that reads the SKILL.md standard. npx skills add MiddleSugar7000/premium-saas-web-skill installs it for all of them.

How was it tested?

With Claude Opus 5.5. The same four one-line prompts ran in separate claude -p processes in empty folders with no memory, once with the skill and once without. 97.5% of automated checks passed with the skill, 75% without. The pages above are the unedited output.

Is it free for client work?

Yes, it's MIT licensed.

Can I hire someone to build my site instead?

Yes. Vantle, the studio behind this skill, designs and builds landing pages, SaaS products and AI features, and replies within one business day. Start a project.