Developer Builds Personal OS App with Claude Code and Mowgli in 3 Hours
A developer documented building a personal OS application called Longinus in under 3 hours using AI coding tools. The app integrates multiple communication platforms and provides AI-powered organization features.
Project Details
Longinus is a personal OS application that:
- Integrates Slack, WhatsApp, and personal feeds
- Digests daily/weekly activity summaries
- Supports saving items as "Sparks" (todos, reminders, journal entries, bookmarks)
- Includes an AI chat interface for discussing saved Sparks
- Aims to reduce context switching between different AI tools
Development Process
The developer used:
- Claude Code on a Max plan with Opus 4.6 for coding
- Mowgli (https://mowgli.ai) for design specification and to reduce token consumption
Time breakdown:
- 1 hour for design and specification
- 2 hours for building, testing, and implementation
Current Status and Future Plans
The project is available on GitHub at https://github.com/othersidejann/longinus. The AI features are described as "still rough around the edges," with synthesis and other AI improvements planned for future development. The developer welcomes pull requests and ideas for AI feature enhancements.
The final design can be viewed at https://app.mowgli.ai/projects/cmm4z67af000i01mp6o893qia.
📖 Read the full source: r/ClaudeAI
👀 See Also
Running Gemma 4 as a Local Autonomous Agent with Claude Code on 16GB VRAM
A developer successfully configured Google's Gemma 4 31B model to function as a local autonomous coding agent through Claude Code CLI v2.1.92, overcoming VRAM limitations and parsing issues using llama.cpp b8672 and custom Python routing.
AI Agents Independently Build Guardrails in Open-Ended Experiment
A developer ran 5 AI agents for 3 weeks with an open brief to solve developer problems. 28 out of 170+ prototypes independently converged on building security scanners and cost controls—guardrails the agents created for themselves without being asked.
Financial Analyst Uses Claude Code to Build DCF Model Without Coding Experience
A financial analyst with no terminal experience used Claude Code to build a discounted cash flow model in 20-25 minutes instead of 1-2 days. The tool read financial files and generated a fully structured Excel model with working formulas after the user typed /dcf [company name].
Browser-based curling game built with Claude Sonnet 4.5 by non-coder
A developer with zero coding experience built a fully playable browser-based curling game using Claude Sonnet 4.5. The game includes physics, scoring, and complete game flow, with Claude handling all code generation, debugging, and refinement based on plain English feedback.