About 4diary
A privacy-focused solution for the modern world. Built with end-to-end encryption, zero-knowledge architecture, and open-source freedom.
Privacy & Security
- • End-to-End Encryption with AES-256-GCM
- • Zero-Knowledge Architecture
- • Client-side only encryption
- • Master keys never leave your device
Features
- • Notion-like Rich Text Editor
- • Kanban Boards for Task Management
- • Ephemeral Share Links
- • PWA Support with Offline Capabilities
Self-Hostable
- • Docker-ready deployment
- • Complete data ownership
- • Open-source (BSD-3-Clause)
- • No vendor lock-in
Tech Stack
- • Next.js 16 (App Router)
- • MongoDB & Redis
- • Tailwind CSS v4
- • Web Crypto API
The Lead Dev
Harsha Bhattacharyya
Passionate about privacy, security, and building tools that respect user data. Creating 4diary to give everyone a secure space for their thoughts.
@Harsha-Bhattacharyya🏆 Hack This Fall 2025
Proudly built for and submitted to Hack This Fall 2025 — one of India's largest hackathons.
✨Where privacy meets innovation✨