Guliel vs Invoice Ninja — honest comparison (2026)

Summary

Invoice Ninja is the closest structural rival we have. Both ship a free tier, both have a real API, both target small teams over enterprise. The split is clean: Invoice Ninja's wedge is open-source and self-hostable — you can fork it, run it on your own box, and pay nothing forever. Guliel's wedge is country-specific compliance, bidirectional supplier flow, integrated logistics, and a native AI companion. If your priority is owning your invoicing stack and writing your own code against it, Invoice Ninja is the right answer. If you'd rather move into a hosted system that already speaks Peppol BIS Billing 3.0, XRechnung, ZUGFeRD, Japan QIS, and a dozen other formats — and is building toward the round-trip where stock drops reorder themselves — that's us.

Feature comparison

Dimension	Invoice Ninja	Guliel
Pricing	Free / $10–14/mo	Free / $20 / $99 per org
Free tier	Yes	Yes (200 invoices/mo)
Self-hostable	Yes	No
Open source	Yes	No
Multi-country e-invoicing compliance	Generic templates	38+ countries, native formats
Peppol BIS Billing 3.0	Partial / community	ZUGFeRD live; Peppol AP later this year
Bidirectional supplier flow	No	Yes
Logistics / SKU + auto-reorder	No	Yes (in flight)
AI companion (operates the system)	No	Yes
MCP server for external agents	No	Yes
REST API	Yes	Yes
Configurable automations	Limited	Free 5 / paid unlimited
Multi-org under one account	Yes	Yes
Double-entry accounting	No	No
Built-in payment processing	Via Stripe/PayPal integrations	Roadmap

Pricing comparison

Plan	Invoice Ninja	Guliel
Free	Forever-free hosted tier	$0 / org — 200 invoices / 5 automations / 10 AI messages
Entry paid	Ninja Pro ~$10/mo	Standard $20 / org / mo
Higher tier	Enterprise ~$14/mo	Premium $99 / org / mo
Self-hosted	Free (community)	Not offered

Invoice Ninja's pricing is per user; Guliel's pricing is per organization, not per seat. If you have one org and twelve people working in it, Guliel stays at one subscription. See pricing for the full table.

Pick Invoice Ninja when…

You want to own the source. You're a developer or a single-operator agency, you're comfortable running PHP and a database, and the idea of paying $0 forever by hosting it yourself sounds correct. You don't need country-specific e-invoicing formats beyond generic PDFs, you're not running a supplier network that needs orders flowing back as invoices, and you don't care about an AI that builds automations for you. Invoice Ninja's open-source license also gives you the freedom to modify behavior, white-label aggressively, or build a private fork — none of which we offer. If self-hosting and source control rank above compliance and supplier automation on your list, stop reading and go install Invoice Ninja.

Pick Guliel when…

You operate across borders. You ship invoices that must conform to Peppol BIS Billing 3.0, XRechnung, ZUGFeRD, NF-e, CFDI, Japan QIS, or any of the 38+ country formats we already ship. You buy from suppliers as well as sell to clients, and you want orders to flow out, invoices to flow back, and reconciliation to happen on its own — instead of stitched together over email. You'd rather forward a receipt and have the vendor, amount, and tax extract themselves than build that pipeline yourself. You want an AI companion that can build automations from natural language, and an MCP server so Claude or ChatGPT can operate your back office. You're fine with hosted SaaS. Start at /invoicing or come straight from Invoice Ninja via /migrate/from-invoice-ninja.

FAQ

Is Invoice Ninja free forever?

Yes — the self-hosted community edition is free, and there's a hosted free tier with limits on counts. The paid hosted plans start around $10/mo per user. Guliel's free tier is also free forever at $0 / org with a 200-invoice monthly cap.

Can I self-host Guliel like Invoice Ninja?

No. Guliel is hosted SaaS only. If self-hosting is a hard requirement, Invoice Ninja is the right pick. We chose hosted so we can ship country-compliance updates and AI improvements continuously without asking customers to upgrade their server.

Does Invoice Ninja handle Peppol or XRechnung natively?

Partially. There's community work on Peppol, and templates can be customized, but native multi-country compliance is not the product's center of gravity. Guliel is built around country-modular document compliance — 38+ jurisdictions today, more shipping monthly.

How does the supplier flow differ?

Invoice Ninja models vendors as a contact type for expense entry. Guliel models suppliers as the other side of a round trip: you send an order from inside Guliel, the supplier gets notified, they issue an invoice against that order, and the invoice flows back for reconciliation. Nobody else does bidirectional supplier flow.

Can I migrate from Invoice Ninja to Guliel?

Yes — see /migrate/from-invoice-ninja. We import clients, invoices, and payments from Invoice Ninja's standard exports. Because Invoice Ninja is open-source, you can also pull directly from the database if you self-host. Move in, keep the history.

What about the API and MCP?

Both products have a clean REST API. Guliel also ships an MCP server so external AI agents — Claude, ChatGPT, anything — can operate the platform natively. Invoice Ninja does not have an MCP server today.

Start free at /pricing.