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SPECIFICTION
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REI3

rei3.de

From €3.50/mo Free plan WebWindowsLinuxiOSAndroidAPI
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Spec score 8.8 #30 of 177 in No-code app builders

Spec sheet

Purpose
REI3 is an open-source business application platform for deploying existing apps or building new applications to meet software requirements.Read 12 Oct 2026 · rei3.de
Deployment
REI3 can be hosted on-premise or in the cloud, and its applications are accessed from devices with a modern browser.Read 12 Oct 2026 · rei3.de
Free plan
YesRead 22 Sep 2026 · rei3.de
Integrations
Connectors include REST APIs, LDAP and Active Directory, OpenID Connect, SMTP, IMAP, and calendar data via ICS.Read 12 Oct 2026 · rei3.de
Security
REI3 supports built-in end-to-end encryption with user key management, multi-factor authentication, and role and record-level access controls.Read 12 Oct 2026 · rei3.de
Support
The free offering lists contact-form support with best-effort response, while Professional lists email support with a one-work-day response time.Read 12 Oct 2026 · rei3.de
Headquarters
Munich, GermanyRead 28 Sep 2026 · rei3.de
API integrations
YesRead 22 Sep 2026 · rei3.de
App authenticity
The official application repository's apps are checked and signed by REI3 developers; third-party app signatures can be verified before installation.Read 12 Oct 2026 · rei3.de
App types
webRead 22 Sep 2026 · rei3.de
Availability
A public demo system is available for live testing without registration.Read 12 Oct 2026 · rei3.de
Built-in database
YesRead 22 Sep 2026 · rei3.de
Mobile access
REI3 supports mobile browsers and can be installed to the home screen on iOS and Android as a progressive web app.Read 12 Oct 2026 · rei3.de
Notable limitation
The maker notes that REI3 is built on web technologies and that native applications can have benefits outside a browser.Read 12 Oct 2026 · rei3.de
Professional license limits
Professional licensing is based on concurrent users, and each licensed user includes three limited users who cannot be administrators and can have only one application role.Read 12 Oct 2026 · rei3.de
User authentication
YesRead 22 Sep 2026 · rei3.de
Visual builder
Applications are built with a graphical Builder for defining data structures, user interfaces, and record access.Read 12 Oct 2026 · rei3.de
Who it is for
The maker describes REI3 as particularly strong for internal software needs, including replacing spreadsheet or Access-based multi-user processes.Read 12 Oct 2026 · rei3.de
Workflow and data features
The platform supports forms, workflows, schedulers, notifications, access policies, file and email processing, and CSV import/export.Read 12 Oct 2026 · rei3.de

Plans and prices

Free Free No user limit · unlimited storage, API calls, email handling, backend processing, frontend scripts and app developers Read 12 Oct 2026 · rei3.de
REI3 Professional (1–10 users) €5.50 a month Per user & month 1–10 users · 3 additional limited users per licensed user Read 22 Sep 2026 · rei3.de
REI3 Professional (11–25 users) Price not published 11–25 users · 3 additional limited users per licensed user Read 22 Sep 2026 · rei3.de
REI3 Professional (26–50 users) €4.50 a month Per user & month 26–50 users · 3 additional limited users per licensed user Read 22 Sep 2026 · rei3.de
REI3 Professional (51–100 users) Price not published 51–100 users · 3 additional limited users per licensed user Read 22 Sep 2026 · rei3.de
REI3 Professional (101+ users) €3.50 a month Per user & month 101+ users · 3 additional limited users per licensed user Read 22 Sep 2026 · rei3.de
REI3 Professional €3.50 a month per user & month; 101+ users Concurrent-user licensing · 3 additional limited users per licensed user Read 12 Oct 2026 · rei3.de

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