REI3

The open low-code platform for business applications

About REI3

REI3 is an open-source low-code platform for building powerful multi-user business applications without spreadsheets and shared mailboxes. You create data stores, build forms, set up workflows, control access, call APIs, and schedule notifications, all integrated in one platform. Ready-made applications cover time tracking, request handling, asset and task management, and secure password sharing. REI3 is free to use for private or commercial purposes and can be self-hosted on-premise or in the cloud, with optional enterprise services available.

REI3 website preview

Live preview of rei3.de via the WordPress mShots service — it can take a few seconds to generate on a first visit.

REI3: strengths & things to check

Strengths

Completely free to use — this directory lists no paid plan for it.
Covers low code, business apps, self hosted, open source — see the focus areas listed in its key facts.
Has 6 close alternatives in the same category on this page, so switching or comparing is easy.

Things to check

Free tools can change their model or shut down — avoid locking critical work into it without an export path.
Current plan prices are not listed here (they change too often to print reliably) — confirm the exact price on the official site.
It is one of 2092 tools in the Productivity & Notes category here — compare it against the alternatives below before you commit.

Derived from this listing's own data (pricing model, focus areas and category) — not a hands-on review score.

REI3 pricing

Pricing model	Free — listed in this directory as a free tool, with no paid plan required to use it.
Free access	Yes — fully free
Current plan prices	Listed on the official site — prices change, so this directory links out instead of printing a number that may already be stale.
Official site	rei3.de

REI3 key facts

Category: Productivity & Notes
Pricing: Free — listed in this directory as a free tool, with no paid plan required to use it.
Focus areas: low code, business apps, self hosted, open source
Official site: rei3.de

REI3 FAQ

How much does REI3 cost?

Free — listed in this directory as a free tool, with no paid plan required to use it. Current plans and prices are listed on the official site (rei3.de).

What is REI3 used for?

The open low-code platform for business applications Its focus areas in the Productivity & Notes category: low code, business apps, self hosted, open source.

Where can I try REI3?

On its official site, rei3.de — the Visit Official Site button above goes straight there.

REI3 vs alternatives

	REI3	Corteza	Admidio	AdventureLog
Pricing	Free — listed in this directory as a free tool, with no paid plan required to use it.	Free — listed in this directory as a free tool, with no paid plan required to use it.	Free — listed in this directory as a free tool, with no paid plan required to use it.	Free — listed in this directory as a free tool, with no paid plan required to use it.
Focus areas	low code, business apps, self hosted, open source	crm, low code, self hosted, open source	membership, self hosted, open source, clubs	travel, trip planner, self hosted, open source
Official site	rei3.de	cortezaproject.org	admidio.org	adventurelog.app
Directory status	Listed	Listed	Listed	Listed

Side-by-side from each listing's own directory data. Full alternative cards are below.

About the Productivity & Notes category

Notes, tasks, and project tools that keep you organized and focused. The Productivity & Notes category on Tools Hub currently lists 2092 tools. Alongside REI3, it includes Wallos, Note Mark, Plainpad, Turtl.

FreeProductivity & Noteslow-codebusiness-appsself-hostedopen-source

Alternatives to REI3

Tools in the same Productivity & Notes category that share focus areas with REI3 — worth comparing before you commit:

Productivity & Notes

Corteza

The open source Salesforce alternative and low-code platform

Freecrmlow-codeself-hostedopen-source

Productivity & Notes

Admidio

Free membership management for organizations, clubs, and associations

Freemembershipself-hostedopen-sourceclubs

Productivity & Notes

AdventureLog

Travel log, trip planner, and world map in one app

Freetraveltrip-plannerself-hostedopen-source

Productivity & Notes

Alian Hub

Open-source project management - free forever, on your server, run by AI agents

Freeproject-managementopen-sourceself-hostedtime-tracking

Productivity & Notes

An Otter Wiki

A minimalistic wiki powered by Python, Markdown and Git

Freewikimarkdownopen-sourceself-hosted

Productivity & Notes

Antville

Open-source blog hosting software for thousands of blogs

Freebloggingself-hostedopen-sourcepublishing

More in Productivity & Notes

Comparing tools in the Productivity & Notes category? These related listings are worth a look: Wallos — Open-source personal subscription tracker with statistics and notifications; Note Mark — Minimal web-based Markdown notes app, fast and open source; Plainpad — Free, open source, and private note-taking app.