Francesco Mistero
Kappaemme is the personal indie-hacker brand of Francesco Mistero, a computer science student at Università degli Studi di Napoli Federico II who builds small, useful digital products and open-source AI coding-agent skills, shipping fast and iterating from real-world usage.
At a Glance
- Developers using AI coding agents (Codex, Claude Code, Cursor, Windsurf, Gemini CLI)
- Skill authors publishing reusable agent workflows
- Students and knowledge workers looking for focus and productivity tools
- Indie hackers and solo builders
AI Tools by Francesco Mistero
(2)
Codex First Customer Finder Skill
Startup First Customer Finder Skill
Codex Startup Pressure Test Skill
AI Startup Idea Validator Skill
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Products & Services
Study and work companion combining lofi music, ambient sound mixing, tasks, notes, calendar and a focus timer. Live at vibedesk.online.
A marketplace for AI agent skills — discover, install and publish reusable skills for Codex and Claude, callable as slash commands. Skills install via a one-line CLI (e.g. `npx --yes slashcmds install code-review`) and publish from a GitHub repository. Works with Codex, Claude, Cursor, OpenCode, Windsurf and Gemini CLI. Live at slashcmd.dev.
Minimal widget app for deep focus — tasks, timer and music available from the phone home screen. Live at pocketflow.online.
Fantasy football app for drafting and building a dream team from World Cup players. Live at glorydraw.online.
Market Position
A one-person indie operation rather than a funded company. slashcmd positions itself as an open, CLI-first marketplace for agent skills that works across multiple AI coding agents instead of being tied to a single vendor, with free publishing for the first five skills lowering the barrier for skill authors.
Key Competitors
Leadership
Founders
Francesco Mistero
Also known online as Kappaemme. Computer science student at Università degli Studi di Napoli Federico II (2023–present), based in Naples, Italy. Participated in the Apple Foundation Program in 2024. Began building and shipping products publicly as an indie hacker in October 2025. Works in C, Java, JavaScript, Python, React and Electron, with Firebase, PostgreSQL, Railway and Stripe. GitHub: Kappaemme-git; X: @Kappaemme1926.
Founding Story
Francesco Mistero started building in public in October 2025 while studying computer science in Naples, describing it as a mindset shift about software: turning what he learns into small, useful tools and shipping them rather than waiting to feel ready. The Kappaemme site (kappaemme.dev) collects his shipped products and his library of open-source Codex/Claude agent skills. As of mid-2026 he had shipped four live products and eight published agent skills.
Business Model
Revenue Model
Freemium product sales and donations from a solo developer. slashcmd offers a free tier and a paid unlimited-publishing tier; Stripe is listed in the stack as the payments provider. The Kappaemme site also carries a 'Buy me a coffee' donation ask to support future builds.
Pricing Tiers
Publish up to 5 skills to the marketplace at no cost; browsing and installing skills is free.
Paid tier for publishing unlimited skills. No price amount is shown on the public site, so the exact figure is not publicly retrievable.
Target Markets
- Developers using AI coding agents (Codex, Claude Code, Cursor, Windsurf, Gemini CLI)
- Skill authors publishing reusable agent workflows
- Students and knowledge workers looking for focus and productivity tools
- Indie hackers and solo builders
- Discovering, installing and publishing reusable skills for AI coding agents
- Focused study and deep-work sessions with music and timers
- Task, note and calendar management for students and solo workers
- Automated code complexity analysis and design/UX audits via agent skills
- Fantasy football drafting around World Cup squads