Celerp

Your Business, Your Data

Celerp is a local-first ERP for accounting, inventory, sales, purchasing, manufacturing, and related business operations. It runs on your own hardware, with a desktop app for Windows, macOS, and Linux or a simple pip install for developers.

Instead of stitching together accounting software, inventory tools, spreadsheets, and custom systems, Celerp brings them together in one application while keeping the software and data under your control.

Start in minutes

ERP software normally comes with a lot of setup. Celerp is designed not to.

Download the desktop app and run it. PostgreSQL is bundled, so there is no separate database to install or configure. There is no account or credit card required to get started.

Developers can install it with:

pip install celerp
celerp init

On first run, choose from 16 industry presets to load a starting configuration and the modules relevant to your type of business.

One machine can run it for your office

Celerp starts a local server, so one computer can host the system while people around the office access it through their browsers.

There is no application to install on every workstation. Users can have their own accounts, roles, and permissions while working from the same shared business database. Concurrent team access is available through Celerp Connect.

Celerp also works offline, so the core business system does not depend on an internet connection or an external SaaS provider to keep running.

Accounting, inventory, and operations together

Celerp currently includes functionality for:

• Accounting - double-entry accounting, chart of accounts, journal entries, trial balance, P&L, balance sheet, and automatic accounting from business documents
• Inventory - multiple locations, costing, batches, expiration dates, barcodes, labels, and stock tracking
• Sales and purchasing - invoices, purchase orders, quotations, credit notes, and related documents
• Manufacturing - bills of materials, production orders, and material transformations
• Business management - contacts, CRM, multi-company support, recurring billing, roles, and permissions
• Data and integrations - CSV import/export, a REST API, and connectors for external accounting systems, e-commerce platforms, and other services
• Auditability - an immutable record of changes throughout the system

Many fields can also be edited directly in place, making common workflows feel closer to working in a spreadsheet than navigating through traditional ERP input screens.

Build the parts your business needs

Celerp is built around independently installable modules. Inventory, accounting, manufacturing, and the other functionality shipped with Celerp use the same module system available to developers.

If your business needs something Celerp does not already provide, you can give an AI coding tool Celerp's module template and documentation, describe the workflow your business needs, and use it to help build a module that can be installed directly into Celerp.

The goal is to make customization additive rather than gradually turning every implementation into a separate version of the software that becomes difficult to maintain or upgrade.

Your system, your data

Celerp stores its data in a standard PostgreSQL database on infrastructure you control.

You can export your data as CSV or JSON, use the REST API to integrate with other systems, and continue operating the local application independently of optional Celerp Connect services.

For developers

Under the hood, Celerp uses:

• Python and FastAPI
• FastHTML
• PostgreSQL
• An event-sourced architecture with an immutable audit trail
• A module API for adding models, routes, UI, and business logic
• A REST API for automation and external integrations

The same extension system used to build Celerp's own business modules is available for building your own.

Make it fit your business

Celerp is built for businesses that want the convenience of modern business software without giving up control over how it runs, where their data lives, or how the system can evolve.

Download the desktop app, install it with pip, or explore the source on GitHub.