REI3 is unclaimed —

REI3

The Open Low-Code Platform·rei3.de

REI3 is an open-source, low-code platform for building multi-user business applications without extensive coding. Users can create data stores, build forms, set up workflows, manage access control, call APIs, and schedule notifications through a graphical application builder. It can be self-hosted on-premise or run in the cloud, and existing ready-made REI3 applications (e.g. for time tracking, request handling, password sharing) are available to deploy directly. The platform is free to use, with optional enterprise support and services.

What it's for

Building custom multi-user business applicationsTime trackingRequest handlingSecure password sharingProject managementAsset managementEmail processing and automationWorkflow automationScheduling notificationsCalling and serving REST APIsReplacing spreadsheets and shared mailboxes

Features 24

Backend functions based on PostgreSQL PL/pgSQL
Bulk record updates
Central application repository for sharing/updating apps
Clustering for scaling across multiple servers
CSV import/export
Dynamic form states and field focus controls
Email sending and receiving (SMTP/IMAP)
End-to-end encryption with key management
File management with versioning and hard-links
Flexible responsive form layouts
Frontend functions (JavaScript-based logic)
Full-text search and large text indexing
Global search across applications
Graphical application builder (Builder)
ICS calendar subscription/download
Integrated automated backups
LDAP/Active Directory integration and same-sign-in
Lists, calendars, Gantt plans, Kanban boards, and charts (via Echarts)
Multi-factor authentication
OpenID Connect (OAuth2) single sign-on
Relational data modeling (1:1, 1:n, n:1, n:m)
REST API server and client
Role-based and policy-based access control
Sub forms and floating/inline forms

At a glance

free tieropen sourceself-hostableAPI

TypeWeb app

DeploymentSelf-hosted

PlatformsWeb, Windows, Linux

Forbusinesses

Integrations

Microsoft EntraOutlookEchartsKeyCloakLDAPOpenID ConnectGoogle CalendarMicrosoft O365ThunderbirdActive Directory

Complianceself-reported

GDPR

Resources

Pricing

REI3 itself is free and open source for private or commercial use. Enterprise features and professional services are available if needed, but no pricing is published for these.

REI3Free

Enterprise features and services available separately if needed; no price disclosed for these.

Free to use for private or commercial use with no stated usage limits