Haru
Built entirely by hand, Haru is a massive productivity ecosystem that has expanded to function almost like a specialized study operating system. The platform helps users research and learn topics faster by rewarding focused work and punishing distractions. It merges offline privacy and real-time online updates by running local AI models (via llama.cpp and fastText) alongside web search tools. Key features include localized RAG across user notes, cognitive minigames, Todoist/ActivityWatch integrations to track computer usage, built-in Excalidraw, advanced calculators, Pomodoro timers, and speech-to-text/text-to-speech engines that generate clean, Obsidian-compatible markdown notes. Active development was completed to focus on smaller, targeted sub-projects after extracting immense learning value from this codebase.
About This Project
Designing an all-encompassing productivity ecosystem that tracks workspace state, compiles markdown summaries, runs local AI inference, and incentivizes focus while eliminating distractions.
Engineered a custom desktop environment using SolidJS and Tauri. Orchestrated llama.cpp for offline RAG, integrated OS-level window and activity tracking via ActivityWatch/Todoist, and implemented speech transcription pipelines to output markdown compatible with Obsidian.
A highly customized 'productivity OS' that unifies notes, tasks, calculators, and mindmaps into a single window. The project served as a massive systems design playground before being completed in favor of smaller modular tools.
AI & Full-stack Developer
2025
Finished
Personal
Technology Stack
Project Story
Designing an all-encompassing productivity ecosystem that tracks workspace state, compiles markdown summaries, runs local AI inference, and incentivizes focus while eliminating distractions.
Engineered a custom desktop environment using SolidJS and Tauri. Orchestrated llama.cpp for offline RAG, integrated OS-level window and activity tracking via ActivityWatch/Todoist, and implemented speech transcription pipelines to output markdown compatible with Obsidian.
A highly customized 'productivity OS' that unifies notes, tasks, calculators, and mindmaps into a single window. The project served as a massive systems design playground before being completed in favor of smaller modular tools.
Insights & Takeaways
Highlights
- Functions as a comprehensive, hand-built 'productivity operating system' housing tools like Excalidraw, Pomodoro, and cognitive minigames.
- Features OS-level activity tracking via Todoist and ActivityWatch integrations to reward focus and warn of distractions.
- Generates Obsidian-ready markdown notes through integrated Speech-to-Text (STT) and Text-to-Speech (TTS) pipelines for audio files and video playlists.
Challenges
- Orchestrating multi-layered local binaries (llama.cpp, fastText) and speech model pipes under a single SolidJS UI without degrading responsiveness.
- Connecting third-party productivity APIs (Todoist, ActivityWatch) to local database records dynamically.
Lessons Learned
- Building a massive, monolithic 'personal OS' provides unmatched architectural training, but also proves that small, single-purpose utilities are often more maintainable.
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