Best Open Source Accounting Software for Small Business (2026): 8 Tools Compared

Search for the best accounting software for small business and almost every result is a paid cloud product. This guide covers the other side: accounting tools whose source code is public and whose license lets you run them on your own server. Every project here has a real license file and a repository that is not archived.

We write for small businesses, freelancers and growing teams, not large enterprises. Every tool below was checked on GitHub for license, archive status and recent activity, and prices are never quoted because they change. Our picks are based on each project's documentation and repository data, not on hands-on benchmarks, so always try a tool with sample data first. This is general information, not tax, legal or accounting advice.

Top picks at a glance

• ERPNext: Full ERP with accounting.
• Bigcapital: Focused small-business accounting.
• Dolibarr ERP CRM: Freelancers and very small teams.

What to look for in accounting software for a small business

• Real double-entry and reports. Make sure the tool keeps a proper ledger and produces a balance sheet, profit and loss and trial balance. An invoice list is not accounting.
• Tax and invoice rules for your country. Tax rates, invoice numbering and filing rules differ by country, for example GST in India or VAT in Europe. Check whether the tool supports your rules or has a community localization.
• Who will maintain it. Self-hosted accounting means you apply updates and run backups. Pick a stack that you or your hosting provider can support.
• Data export. You should be able to export the ledger and documents. Your accountant will ask for them.
• Project health and license. Choose a project that is not archived, has recent releases and a real open source license. Check the LICENSE file, not just the website.

Comparison table: best open source accounting software

Stars and update dates are a snapshot from 16 October 2026 and change daily. They show activity, not quality.

The 8 best open source accounting tools, reviewed

1. ERPNext

Best for: Full ERP with accounting
License: GPL-3.0 · Stack: Python (Frappe), MariaDB · GitHub: 40,232 stars, repo updated Oct 2026

Double-entry accounting sits inside a complete ERP with sales, purchasing, stock and HR. It is the most complete free option for a growing small business, but it needs more setup and learning than a simple bookkeeping app.

Read our full guide to ERPNext · Source on GitHub · Official website

2. Bigcapital

Best for: Focused small-business accounting
License: AGPL-3.0 · Stack: TypeScript (Node.js, React) · GitHub: 3,939 stars, repo updated Oct 2026

A modern accounting app built around invoices and financial reports. A good choice if you want accounting without the rest of an ERP.

Source on GitHub · Official website

3. Dolibarr ERP CRM

Best for: Freelancers and very small teams
License: GPL-3.0 · Stack: PHP, MySQL/MariaDB/PostgreSQL · GitHub: 7,732 stars, repo updated Oct 2026

Combines invoicing, proposals, stock and an accounting module in one PHP application that runs on ordinary hosting.

Read our full guide to Dolibarr ERP CRM · Source on GitHub · Official website

4. LedgerSMB

Best for: Traditional double-entry, multi-user
License: GPL-2.0 · Stack: Perl, PostgreSQL · GitHub: 570 stars, repo updated Oct 2026

A long-running web-based double-entry system with receivables, payables, invoicing and inventory. The interface is plain, and it favors accounting correctness over looks.

Source on GitHub · Official website

5. Odoo Community

Best for: Invoicing; accounting is limited in Community
License: LGPL-3.0 (Community edition) · Stack: Python, PostgreSQL · GitHub: 55,072 stars, repo updated Oct 2026

Odoo Community includes an Invoicing app, but the full Accounting app (bank reconciliation, advanced reports) belongs to the paid Enterprise edition. Check this before you plan around it.

Read our full guide to Odoo Community · Source on GitHub · Official website

6. GnuCash

Best for: One bookkeeper on a desktop
License: GPL-2.0 or GPL-3.0 · Stack: C (desktop app) · GitHub: 4,378 stars, repo updated Oct 2026

Mature desktop double-entry accounting. It is mainly a single-user application with no built-in web access.

Source on GitHub · Official website

7. hledger

Best for: Technical users who like plain text
License: GPL-3.0 · Stack: Haskell (plain-text accounting) · GitHub: 4,766 stars, repo updated Oct 2026

A command-line tool that reads a plain-text journal and prints balance sheet, income statement and cash flow reports. Great for developers, not for a typical office.

Source on GitHub · Official website

8. ERPSAAS

Best for: Laravel-based accounting platform
License: MIT · Stack: PHP (Laravel, Filament) · GitHub: 1,476 stars, repo updated Mar 2026

A newer MIT-licensed accounting platform built with Laravel and Filament. The community is smaller and repository updates are less frequent, so evaluate it carefully.

Source on GitHub

Open source vs paid accounting software

Paid cloud products usually win on polish, mobile apps, automatic bank connections and support. Open source wins on running cost as you grow, data ownership and the freedom to customize. The real cost of open source is hosting, backups, updates and your own time, so count those honestly. Several of these projects also sell hosting or support if you would rather not run a server yourself.

How to choose the best accounting software

• You want accounting plus inventory, sales and HR: ERPNext or Dolibarr.
• You only need invoices and financial reports: Bigcapital.
• You are one person who likes a desktop app: GnuCash.
• You are comfortable with the command line: hledger.

Popular tools that are not open source (or not maintained)

These names show up in many "open source" lists, so check the license before you choose them:

• Akaunting: Licensed under the Business Source License (BSL), a source-available license, not an open source license. Repository
• Invoice Ninja: Licensed under the Elastic License 2.0, which is source-available but not open source. Repository
• Frappe Books: The GitHub repository is archived (read-only), so it no longer receives updates. Repository

Checked from the projects' LICENSE files and GitHub status on 16 October 2026. Licenses can change.

Mistakes to avoid

Be careful with tools that are called open source but are not. See the license warnings below. For a sole trader with a few invoices a month, a simple invoicing tool and a spreadsheet may be enough. Move to a full ledger when you need balance sheets, bank reconciliation or accountant access.

Where to host it

All of these tools can be self-hosted. A small VPS or a web hosting plan from a provider such as Hostinger is enough to get started with most of them. Check each project's requirements first, and read our security and backup checklist before you add real data.

Related comparisons

• Best Open Source Bookkeeping Software for Small Business
• Best Open Source Invoicing Software for Small Business
• Best Open Source Bank Reconciliation Software (2026)
• Best Open Source ERP Software for Small Business

All open source business software comparisons

• Accounting
• Bookkeeping
• Billing
• Invoicing
• Payroll
• Inventory Management
• Warehouse Management
• Expense Tracking
• Spend Management
• Accounts Payable
• Accounts Receivable
• Cash Flow Management
• Bank Reconciliation
• Purchase Order
• Vendor Management
• Point of Sale (POS)
• Time Tracking
• Quotation & Estimates
• Revenue Recognition
• Financial Reporting
• Asset Management
• Lead Management
• Sales Pipeline
• ERP

Also see our directory of 50 open source CRMs.