Small software. Wide experiments. Fast launches.
SFI Digital builds focused apps, useful browser tools, mobile experiments, and prototypes across web, mobile, desktop, and games.
Project highlights
Language app
CuppaCards
English learning for Traditional Chinese readers in the UK.
Web tool
PocketWrench
Free no-login tools that run fully in the browser.
What we build
Useful little products
We use each project to test ideas, sharpen craft, and ship something practical.
Availability
Smart ideas. Fast builds. Intelligent tools.
SFI started as Smart, Fast, Intelligent. That still guides the way we test, build, and refine small software.
What we build
A wide mix of small builds, practical tools, and prototypes, tied together by fast learning and focused execution.
Owned Apps
We design, build, and operate small apps that explore focused use cases across mobile and web.
View appsBrowser Tools
We create lightweight web utilities that run client-side, avoid logins, and solve practical tasks quickly.
Experiments
We use prototypes across desktop, mobile, and games to test ideas and learn new product directions.
See experimentsHow we build
SFI started as Smart, Fast, Intelligent. The name still describes how we build and learn.
Smart
- Useful tools over feature noise
- Clear product thinking from the start
- Simple interfaces for specific jobs
- Ideas tested through real builds
Fast
- We validate early with small launches
- We ship focused, reliable versions
- We keep scope tight and predictable
- We avoid unnecessary layers and noise
Intelligent
- Learning captured from every project
- Maintainability over short demos
- Different platforms used deliberately
- Experiments that shape what comes next
Current apps
Public apps and small tools that show the current direction of SFI Digital.
CuppaCards
English learning cards for Traditional Chinese readers living in the UK.
Open projectPocketWrench
A free multi-tool app that runs fully in the browser with no login.
Open projectCookMate
A cross-platform cooking and recipe app built to test mobile product workflows.
Open projectMyCalc
A calculation app with saved variables for quick repeated calculations.
Open projectWhat we are exploring
A mix of launched apps and prototypes keeps the studio moving across different platforms.
Mobile app learning
Testing how small ideas behave on real mobile devices.
CookMate and MyCalc explore local storage, app permissions, and everyday utility.
Better understanding of cross-platform app flow and lightweight product scope.
Client-side web tools
Many useful tools ask for accounts when the task does not need one.
PocketWrench keeps tools free, browser-based, and privacy-friendly.
A practical direction for fast utilities that respect user time.
Game prototype
Action games need fast feedback loops and clear interaction feel.
A 2D action prototype explores movement, combat rhythm, and game-state structure.
A useful sandbox for interactive systems beyond standard app interfaces.
Let’s talk
Send feedback, ask about an app, or start a practical conversation about collaboration.
Contact SFI Digital