01
JJ Storage Cleaner
A storage-cleanup utility for macOS that helps review large files, duplicates and developer files before safely moving selected items to Trash.
View projectMobile apps · Games · Interactive experiences
I build digital products people can use, play and enjoy.
I'm Jeronimo Junior, an independent developer behind JJ Studio Entertainment. I design and build mobile apps, games and interactive projects for Apple, Android and the web.
Recent work
Recent apps and projects I've designed and built.
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JJ Vault
A privacy-focused password manager designed for securely organizing credentials with a clear, simple mobile experience.
View project
03
World Quotes
A curated quotes experience with daily inspiration, categories, Favorites and Quote Studio tools in English, Portuguese and Spanish.
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04
Gustiva
A recipe and kitchen companion with recipe discovery, Favorites, search, measurement tools and a cooking timer.
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05
WaraFun
A social entertainment app with group games, jokes, sounds, funny audio and casual activities designed for playing together.
View projectPlayable in the browser
Don't just see the work. Play it.
About
From code to shipped products.
I enjoy turning ideas into working software — from practical mobile apps to games and browser experiments. My background spans multiple languages and platforms, with a focus on building things that are clear, useful and enjoyable.
JJ Studio Entertainment is where I publish and showcase that work, while the main JJ Studio site is home to my technology articles and tutorials.
What I build
Focused development, without the agency noise.
Mobile Apps
Native and cross-platform applications designed around real user needs and clear interfaces.
Games
2D and interactive game experiences for mobile and the browser, from prototypes to published projects.
Prototypes & Experiments
Technical prototypes and small interactive ideas used to explore mechanics, interfaces and new technologies.
Let's build something
Have an idea, opportunity or project?
If my work looks like a good fit for what you're building, I'd be happy to hear about it.
[email protected]