Why we bet on Odoo

The ERP we'd build if it didn't already exist.

Open-source. Modular. SME-native. Surprisingly future-proof. Here's the honest case for why every Mainsail client runs on Odoo including where it falls short.

Book a free audit → See the comparison

16M+

Active users worldwide

80+

Native apps integrated

5,000+

OCA community modules

175+

Countries deployed

— Our thesis

Four reasons we picked Odoo.
All verifiable.

Not marketing claims, operational facts that compound over the lifetime of your ERP. Each one is checkable in 5 minutes on GitHub or by talking to any of our clients.

Open-source is the only honest ERP

Your invoices, your stock, your customer history - these belong to you. Odoo is the only major ERP where you can read every line of code on GitHub, fork it, host it where you want. Closed ERPs (SAP, NetSuite, Oracle) hold your data hostage by API.

SME-first, not enterprise-second

Odoo was built bottom-up for companies of 10–250 people. SAP and Oracle are enterprise-first products that get awkwardly downscaled to fit SMEs. The UX, the pricing, the implementation timeline - everything is designed for businesses your size.

AI-native, by accident

Every AI agent demo runs on top of structured data. Odoo happens to be that, a Python-native ORM with documented schema and queryable workflows. MCP servers exist today. AI doesn't need to be retrofitted; it plugs in.

No vendor lock-in, ever

Want to switch hosting providers? Done. Want to fork the platform? Done. Want to migrate away in 5 years? Your data is in Postgres, your customizations are in Python, your pages are HTML. Try doing that with NetSuite.

— Under the hood

A custom field
in 4 lines.

Most ERPs require certified consultants and weeks of training to add a single field. With Odoo, your dev opens a Python file and ships in 20 minutes. Here's an actual snippet - production code, not a slide deck demo.

PILLAR 01

Pure Python

No proprietary DSL. No "low-code platform" abstractions. Just classes, fields, and methods.

PILLAR 02

ORM-driven

Every record is an object. Queries, validations, and triggers are Python decorators.

PILLAR 03

Public API + GitHub source

Full source on GitHub. Public REST + XML-RPC API. Docs at odoo.com/documentation.

PILLAR 04

OCA - 5,000+ modules

The Community Association maintains peer-reviewed modules. Your edge case probably exists.

addons/sale_priority/models/sale_order.py

# Add a custom Priority field to Sales Order — 4 lines. from odoo import models, fields, api class SaleOrder(models.Model): _inherit = 'sale.order' priority_score = fields.Integer( string="Priority", compute="_compute_priority", store=True, ) def _compute_priority(self): for order in self: order.priority_score = ( order.amount_total * 0.6 + order.partner_id.credit_score * 0.4 ) # Deploy with a `git push`. Done.

— Side-by-side

How Odoo stacks up.

Two honest tables - Enterprise giants on one side, SME-focused ERPs on the other. Pick your weight class.

	Odoo Enterprise	SAP S/4HANA	Oracle NetSuite	Oracle Fusion
Annual licence (SME)	€8k–€80k	€100k+	€80k+	€150k+
Time to first go-live	3–6 months	12–24	9–18	12–24
Customization model	Open-source	ABAP	SuiteScript	PaaS
Native app breadth	80+	Wide	Wide	Very wide
Friendly UX	Built for it	Enterprise-heavy	Decent	Enterprise-heavy
Vendor lock-in	Low	High	High	High
AI extensibility	MCP-ready	Vendor roadmap	Vendor roadmap	Vendor roadmap

	Odoo ENTREPRISE	PHC	Sage 100	Zoho One
Annual price (SME)	€2k–€8k	€3k–€10k	€5k–€15k	€500–€5k
Time to go-live	2–4 months	3–5	4–6	1–3
All-in-one platform	True all-in-one	PT-focused	Modular	Wide
Open-source	Yes	No	No	No
Customization depth	Unlimited (Python)	PHC scripting	Limited	Deluge
Manufacturing / MRP	Native, mature	Available	Add-on, weak	Limited
SAFT-PT compliant	Native	Native	Add-on	Manual

— The AI question

AI won't replace your ERP. It needs one.

Every "AI agent runs your business" demo runs on top of structured data. Odoo is exactly that database and being open-source, AI plugs in deeper than any closed SaaS allows.

AI needs a substrate

LLMs hallucinate without ground truth. Your invoices, stock, customer history that's the ground truth. Odoo gives AI a clean, structured, real-time view of your business. Every record is a queryable Python object.

Open source = deeper integration

SaaS vendors gatekeep your data through APIs that limit what AI can see and do. Odoo doesn't have that wall. MCP servers for Odoo already exist - we use one in production today.

Workflow automation, supercharged

Manual data entry, repetitive approvals, customer support triage - Odoo's workflow engine + AI co-pilots eliminate the busy work. Your team focuses on judgment, not transcription.

Future-proof, not future-fragile

Closed ERPs need vendor permission to add AI. Odoo + AI is plug-in. New AI capabilities ship as Odoo modules within days of release - not annual product cycles.

— When Odoo isn't right

The honest part: Odoo isn't for everyone.

We tell every prospect the same thing during the audit. Roughly 30% of our first calls end with us recommending another solution. Here's when.

01

You're under 10 employees

Odoo's depth is overkill. Better off with Zoho, HubSpot, or a few standalone SaaS. Revisit Odoo when you scale past 15-20 people.
02

You're a listed enterprise group (Fortune 500)

SAP, Oracle, or Microsoft Dynamics still win in extreme scale, multi-entity consolidation, and audit-grade compliance. If you're publicly traded with 500+ employees, the conversation changes.
03

You're in a hyper-niche industry with no Odoo precedent

Pharma compliance, complex government contracting, deep aerospace MRO - these may need industry-specific software. We'll point you to it instead of hammering Odoo to fit.

— Odoo by the numbers

A Belgian software, global momentum.

Founded in 2005 by Fabien Pinckaers in Louvain-la-Neuve, Odoo went from one developer to one of the fastest-growing enterprise software companies in Europe.

44%

ARR growth YTD

€650M

Annual revenue YTD

11k

Partners (Mainsail among them)

90%+

Successful implementations

Want to see if Odoo
fits your business?

30-minute audit. No commitment. Honest answer, including if we recommend another solution.

Book a free audit → See our cases