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.
Troubleshooting & FAQ (2)
TroubleshootingWhy does the REI3 Tickets app show 'You are not authorized to complete this action or access this resource' for an admin when replying or sending emails?
Remove the special public roles from the affected user: Public: Service report and Public: Create ticket. These roles are intended only for unauthenticated/public access users and must not be assigned to regular or admin users. After removing them, retry the ticket reply/email action. This authorization bug is fixed in REI3.11; upgrade to REI3.11 or later if the issue persists after correcting the roles.
TroubleshootingHow do I prevent a REI3 form from focusing the first input when "Set field focus on load" is set to none?
This is a known REI3 form behavior: even when "Set field focus on load" is set to none (-), the first input field can still receive focus. As a workaround, set "Set field focus on load" to target a non-input field, or place a hidden button at the top of the form and target that button. The form will then open without focusing an important editable field.
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Getting Started
Download installer
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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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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.
Having issues? Check the FAQ below
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