v1.3.0 · „Munterer Marder“ · MIT
Contacts, deals, time, calendar and e-invoices in one calm, fast app. Free and open source, running on your own computer. No account, no subscription, no cloud you have to trust. Your data stays in one file on your disk.
macOS · Windows · Linux · free
Screenshots with fictional demo data.
Gerber CRM is a free, open-source CRM by Dirk Gerber (Gerber.Media) for founders, freelancers and small teams. It manages contacts and companies, a deal pipeline, tasks, time tracking and a calendar, and writes invoices as e-invoices to EN 16931 (XRechnung and ZUGFeRD). It runs locally on macOS, Windows and Linux with Python 3.9 or newer and keeps all data in a local SQLite database; on a server it runs with Docker and login. Licence: MIT. Current version: 1.3.0.
Built for people who do everything themselves: one place for the whole way, without five tools and four subscriptions.
People and companies, linked. Tags, birthdays, own fields, a timeline of notes, calls and meetings.
Kanban board from lead to won, drag and drop, value per stage, weighted forecast.
Write a quote, mark it accepted, convert it to an invoice with one click.
PDF, XRechnung (XML) or ZUGFeRD (PDF with embedded XML) to EN 16931. Small-business rule (§ 19 UStG) included.
Income-surplus accounts (EÜR): photograph a receipt, text recognition and optional AI fill in the fields.
Revenue per month, invoiced versus paid, win rate and pipeline funnel.
Invoices are generated to EN 16931; for a certified acceptance, check them with the official validator (KoSIT/Mustang). Gerber CRM is not tax advice.
Linked people and companies, avatars, branches, saved views and tag filters.
Kanban with configurable stages, stale-deal reminders, forecast.
Global timer with pause and stop, hourly rates, billable time into invoices.
Subscribe to Google, Apple or Microsoft calendars, export your own feed, holidays per region.
A public page where clients book free slots themselves, without logging in.
Every change is saved as a snapshot – even deleted records come back.
CSV and vCard in and out, a full ZIP backup, AI-assisted import from other CRMs.
Large type, maximum contrast, no animation, keyboard focus – technically to WCAG 2.1 AA.
Ctrl/Cmd + K jumps anywhere and creates anything.
The whole interface in both languages, switchable at any time.
The assistant summarises contacts, helps with tasks, fills company profiles from Wikipedia and websites and reads receipts. You choose the provider and bring your own key – or run a model locally with Ollama, so nothing leaves your computer. One switch turns all AI off; then the CRM sends no AI requests at all.
Everything sits in one SQLite database plus a folder for pictures and receipts – separate from the program, so updates never touch it. Back it up by copying the folder.
~/Library/Application Support/Gerber CRM%APPDATA%\Gerber CRM~/.local/share/gerber-crmWith Docker the CRM runs on a VM or NAS; the login is switched on there (CRM_AUTH=1). Users with roles, two-factor login (TOTP), Active Directory via LDAP or Microsoft Entra ID via single sign-on. Put it behind HTTPS.
Python 3.9 or newer is needed. On the first start the CRM sets up its Python environment once – that needs internet and takes 1 to 3 minutes. After that it runs at 127.0.0.1:8740, only on your computer, and opens in your browser.
macOS 11 or newer
Installs „Gerber CRM“ into Applications.
Download Gerber-CRM-1.3.0-macOS.pkgNot signed with a paid Apple certificate: on first open, right-click the app and choose „Open“. Python 3: run „xcode-select --install“ in Terminal if asked.
Windows 10 / 11
Setup without admin rights, with Start menu entry and uninstaller.
Download Gerber-CRM-1.3.0-Windows-Setup.exeNot signed with a paid certificate: in SmartScreen click „More info“ → „Run anyway“. If Python is missing, setup offers to install it with winget.
Debian, Ubuntu, Mint & others
A .deb package with menu entry, or the one-line installer for any distribution.
Download gerber-crm_1.3.0_all.debInstall the .deb:
sudo apt install ./gerber-crm_1.3.0_all.debLinux & macOS, one line in the terminal:
curl -fsSL https://crm.gerber.media/install.sh | shThe .deb needs python3, python3-venv and python3-pip; apt installs them along.
gerber-crm-1.3.0.tar.gzgerber-crm-1.3.0.zipSHA256SUMS.txtClone the repository and start it – then open http://<server>:8000 and create the first admin.
git clone https://codefloe.com/GerberMedia/Gerber-CRM.git && cd Gerber-CRM && docker compose up -dGerber CRM is developed by Dirk Gerber, with Claude as an AI helper. Software can contain bugs – reports and wishes are very welcome, by e-mail or as an issue. The code is MIT-licensed: use it, change it, share it.
Nothing. It is open source under the MIT licence – no subscription, no account, no limits on contacts or users.
In a SQLite database on your own computer: macOS ~/Library/Application Support/Gerber CRM, Windows %APPDATA%\Gerber CRM, Linux ~/.local/share/gerber-crm. On a server it lives in the Docker volume. Nothing is sent to Gerber.Media.
No. AI is optional and can be switched off completely. If you use it, you choose the provider (OpenAI, Anthropic, Google, or an OpenAI-compatible one such as Ollama running locally) and enter your own key; requests go directly to that provider.
Yes. On a server with Docker the login is on: users with roles, two-factor login, Active Directory via LDAP or Microsoft Entra ID. On a single computer, team members can check in as editors so notes and tasks are attributed.
Gerber CRM generates XRechnung (CII XML) and ZUGFeRD/Factur-X to EN 16931, plus a PDF. For a certified acceptance, check them with the official validator. It is not tax advice.
Install the new version over the old one – the data folder stays untouched. Instances run from the Git repository can update themselves in the options.
On a server it can be installed on phones and tablets as a web app (PWA) from the browser. The local version runs on your computer only.
One person – Dirk Gerber of Gerber.Media on Als, Denmark – with Claude as an AI helper. Software can contain bugs; reports and wishes are welcome at hello@gerber.media or as an issue on Codefloe.
Download Gerber CRM, or tell me what is missing: hello@gerber.media