Francesco Mistero
CS student at Federico II. Building apps and tools.
I am Francesco, aka Kappaemme. I build iPhone apps, websites and open-source tools, and share what I learn through Codex skills.
Projects
5 projectsA small gallery of products I build and maintain. Select a piece to explore it.
VIEW ON APP STORE ↗
Metodo ZAC iPhone app
Coach-led workouts, progress tracking and check-ins.
VISIT WEBSITE ↗
VibeDesk Web app
A study and work companion I am currently building.
More work
Explore all GitHub projects ↗Skill library
10 featuredRecent releases and the open-source skills developers have starred most.
Shared by Greg Brockman
5 quote postsGreg Brockman, OpenAI co-founder, quote-posted five of my Codex skill demos on X. Each card opens his original post.
codex for customer feedback → roadmap
Kappaemme ✓@Kappaemmedev
CODEX SKILL THAT TURNS CUSTOMER FEEDBACK INTO A ROADMAP!
Startup Feedback Engine
Codex for finding customers for your startup:
Kappaemme ✓@Kappaemmedev
CODEX SKILL THAT FINDS YOUR STARTUP'S FIRST CUSTOMERS!
First Customer Finder
codex for improving computational complexity
Kappaemme ✓@Kappaemmedev
CODEX SKILL THAT FINDS COMPLEXITY HOTSPOTS IN YOUR CODEBASE!
Complexity Optimizer
codex for finding local businesses who may need help building a website:
Kappaemme ✓@Kappaemmedev
CODEX SKILL THAT TURNS LOCAL SEARCH INTO CLIENT LEADS!
Local Client Prospector
codex for startup ideas
Kappaemme ✓@Kappaemmedev
CODEX SKILL TO BRUTALLY TEST ANY STARTUP IDEA!
Startup Pressure TestEngagement figures checked on 23 September 2026.
Stack
Journey
Computer Science student
Università degli Studi di Napoli Federico II
- Computer Science student at Università degli Studi di Napoli Federico II.
- 2024 experience at Apple Foundation.
- Growing solid foundations in algorithms, systems, databases, and software engineering.
Indie hacker
Building in public · @Kappaemmedev
- Started in October 2025 and changed my mindset about software.
- Built the Metodo ZAC iPhone app and website.
- Published Codex skills used and starred by developers around the world.
Coffee
support the buildSupport the next build.
I build small digital products, test them in the real world, and keep improving. If something I make is useful to you, a small donation helps me keep shipping.