Dotto
Project
- Client: Internal Tool
- Services: Mobile Development, UI Experimentation
- Application: https://play.google.com/store/apps/details?id=th.co.snowdigital.annotations
Objective
Create a lightweight image annotation mobile application focused on drawing, gesture recognition, and offline sharing.
Tools & Technologies
Expo, React Native, Skia, Zustand, MMKV
Details
Dotto is a minimalist mobile application built to explore canvas rendering and image annotation using React Native and Skia. The app allows users to import images, tap to drop annotation pins, and export the result — all without user authentication or backend integration.
The core interaction is gesture-based: a single tap adds a numbered pin, a double tap removes it. This makes the app lightweight and intuitive, focusing on touch responsiveness and simple annotation tasks.
Dotto leverages Skia for performant on-screen drawing, paired with Zustand and MMKV for smooth, persistent state management. Skia serves as the graphics engine behind major platforms like Google Chrome, Android, ChromeOS, Flutter, and Mozilla Firefox, enabling high-performance rendering that meets industry standards.
Image selection and sharing are powered by Expo modules, keeping the app fully offline and self-contained. The app serves as a proof-of-concept for future annotation tooling, with a roadmap to introduce features like text labels and mini report generation.
As an internal tool, Dotto reflects a focus on rapid prototyping and technical exploration, demonstrating Snow Digital's capabilities in delivering fast, clean mobile interfaces even for micro-utility tools.