ERPNext

by Frappe

ERPNext is a genuinely open-source ERP (GPL) covering accounting, inventory, HR, and manufacturing. For technical teams willing to self-host or use Frappe Cloud, it is the lowest-cost full ERP available. Support and polish trail commercial products.

Best for

Technical small organizations that want open source and near-zero license cost

Reported pricing

Free self-hosted; hosted plans from ~$10/user/mo

Organization size

Small (under 50 employees)

Deployment

Cloud · On-premises

Fund accounting

No (or via add-ons)

Multi-entity consolidation

Yes

Where it wins

✓ Free and open source
✓ Surprisingly broad module coverage

Where it doesn't

✗ Requires technical capacity
✗ Thin North American partner support
✗ No fund accounting

Strengths

Open sourceBudget-friendlyCore financials

Common industries

Services · Manufacturing · Education · Retail & E-commerce

Integrations

Limited ecosystem

Frappe Cloud Marketplace. Small: roughly 190 open-source apps (MIT/GPL only, GitHub-hosted), about 1-2% of Odoo's catalog size.

Notable integrations

Payments app bundles Stripe, PayPal, Razorpay, BraintreeFrappe HR (first-party payroll/HR)n8n has a community ERPNext connector

API quality: REST API on the Frappe Framework with API key/secret and OAuth2 auth, but documentation is community-patched. An "unofficial docs" GitHub project exists specifically because official docs are considered incomplete.

What doesn't connect cleanly

— No confirmed native Avalara integration, a real gap in prebuilt US sales-tax automation
— Self-hosting (the common cost-saving path) requires real ops capacity: tuned MariaDB, Redis, Nginx, the Frappe bench manager, backups. Described by implementers as "not a weekend setup"
— Upgrading a self-hosted instance with any customization is "a multi-day technical project"

Head to head

vs Odoo

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