REI3
REI3 is a free, open-source low-code platform that lets you build and self-host powerful applications with full control and ownership. Replace spreadsheets, automate workflows, and keep your data private.
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Free and open-source low-code platform: build, self-host, and own your applications.
Core Features
- Replace spreadsheet-based solutions with multi-user apps quickly
- Gantt charts, diagrams, business rules, and data summaries
- Built-in workflows, PDF exports, and notifications
- End-to-end encryption with integrated key management
- Cross-platform: Linux x64/ARM64, Windows, mobile PWA
What It Can't Do
- •Requires PostgreSQL database (not MySQL/SQLite). If behind a reverse proxy, disable WebSocket timeouts. No graphical installer on Linux – edit config.json manually. Docker Compose files available for testing but no official Docker image.
Use Cases
- Replace Excel for team task tracking
- Build an internal IT asset management system
- Create a time tracker with workflow approval
- Set up a password manager with end-to-end encryption
Detailed Introduction
REI3 is a free and open-source low-code application platform that lets you build, host, and own powerful applications without vendor lock-in. It replaces spreadsheet-based solutions with multi-user web apps featuring workflows, Gantt charts, end-to-end encryption, full-text search, and mobile-ready interfaces. You can self-host it on-premise or in the cloud, with full control over your data. REI3 supports roles and access policies, REST API integration, PDF exports, and clustering for enterprise growth. Its transparent database allows direct read/write access, and it includes built-in key management for E2EE. Available for Linux (x64/arm64) and Windows.
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Getting Started
Download installer
Click the button above to download the installer for your system
Install the software
Double-click the downloaded installer and follow the prompts
Linux: Download archive, extract to /opt/rei3, make r3 executable
Copy config_template.json to config.json, fill in PostgreSQL connection details (empty UTF8 DB required)
Run sudo ./r3 -install to register service, then sudo systemctl start rei3
- Linux: Download archive, extract to /opt/rei3, make r3 executable
- Copy config_template.json to config.json, fill in PostgreSQL connection details (empty UTF8 DB required)
- Run sudo ./r3 -install to register service, then sudo systemctl start rei3
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Open Source Transparency
View GitHub SourceUninstall Info
Delete the installation directory and configuration files. On Linux, stop service with sudo systemctl stop rei3 && sudo ./r3 -remove.
No Extra Dependencies
Ready to use after download. No additional runtime required.
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