buildfastwithai

Find and qualify evidence-backed potential first customers, early adopters, design partners, or beta users for a startup using recent public pain and buying signals. Use when Codex needs to analyze a product URL or idea, define an ideal customer profile,…

Turn a startup, SaaS, app, developer tool, website, repository, or product idea into an evidence-backed business plan, monetization strategy, pricing architecture, editable 12-month financial model, and 90-day execution roadmap. Use when Codex needs to…

Audit a startup, SaaS, app, developer tool, landing page, or product before launch from a live URL, localhost page, repository, screenshots, or supplied copy. Use when Codex needs to determine what a startup appears to do, test whether its public experience…

Audit and revamp existing web interfaces into polished, professional, product-specific experiences while preserving behavior and working within the current frontend stack. Use for requests to improve a vibe-coded, generic, template-like, inconsistent, dated,…

Make an unfamiliar or undocumented repo easy to run. Use when someone cannot get a project running, when onboarding a new developer, or when asked to write a QUICKSTART, a setup/prerequisite check ("doctor") script, or a documented .env.example. Also use when…

Measure whether Python tests detect behavior changes through diff-scoped mutation testing. Use when Codex needs to audit the strength of a pytest suite, evaluate whether tests cover changed code, investigate surviving mutants, or propose and verify targeted…

Build a complete, polished, production-quality browser game inside a single self-contained HTML file using only vanilla HTML, CSS and JavaScript — no frameworks, no libraries, no external assets. Use this skill whenever the user asks for a game, a playable…

Recreate a UI screenshot, mockup, or design image as production-quality React + TypeScript + Tailwind code with near-pixel-perfect visual fidelity. Use this skill whenever the user shares an image of an interface and wants it built, cloned, converted, or…

Motion Studio - motion designer, art director, animator, editor and sound designer in one skill. Produces polished motion-graphics MP4s from a brief - product ads, demos, explainers, tech news, trailers, logo reveals, kinetic typography, infographics,…

SVG Style Studio (/create-svg) - art director + vector illustrator that makes polished, editable SVGs (illustrations, logos, icons, posters, infographics, stickers) in 44 styles - pixel art, 8/16-bit, cyberpunk, Y2K, Frutiger Aero, glassmorphism, clay,…

Make an original, unconventional animated MP4 video with its own synthesised soundtrack: every frame drawn in code, beat-synced. Use when asked for a creative, unique or "crazy" video on any topic.

Build or transform ecommerce websites from loose company, product, or brand briefs into unconventional, brand-specific shopping experiences with original ImageGen product imagery. Use when a user asks for a crazy, wild, experimental, unconventional,…

Generate high-converting landing pages as production-ready HTML with built-in design themes, copy frameworks (PAS, AIDA, BAB), CTA strategy, SEO meta, and automated conversion/speed audits. Use whenever the user wants a landing page, campaign page, lead…

Audit and revamp existing web interfaces into polished, professional, product-specific experiences while preserving behavior and working within the current frontend stack. Use for requests to improve a vibe-coded, generic, template-like, inconsistent, dated,…

Build or transform lightweight realtime voice-chat apps with a talking character avatar from either a user-supplied photograph or a text description. Use when Codex is asked to create a talking avatar, photo avatar, character chatbot, roleplaying voice…

Build, extend, or polish original 3D browser games and interactive prototypes with Three.js. Use when a user wants a playable WebGL game, a game-like Three.js experience, a 2D concept translated into 3D, or an existing Three.js project given a complete loop,…