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ERP · head to head

Odoo vs Really Simple Systems

Odoo logo

Odoo

ERP

Open-source ERP and CRM suite for all business needs

From
Free
Rated
-
Full reviewWebsite
R

Really Simple Systems

CRM

Easy CRM for small businesses

From
$15/month
Rated
-
Full reviewWebsite

The short version

  • Only Odoo has a free tier, so it costs nothing to try first.
  • Each has a real cost: Odoo the free plan is limited to one app, so any second module moves the whole account to a paid per user plan; Really Simple Systems the vendor's own pricing page as captured by the Internet Archive on 22 October 2019 listed four CRM tiers billed annually: Free at $0 for up to 2 users, Starter at $14 per user per month, Professional at $30 per user per month, and Enterprise at $46 per user per month (each roughly 7 to 10 percent higher if billed monthly); the Marketing add-on was $22 per month for up to 5,000 emails and Advanced Marketing scaled to 50,000 emails per month, though this capture is over five years old
  • They diverge on capability: Odoo covers Sales management, Really Simple Systems covers Contact management.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Odoo and Really Simple Systems actually diverge.

Attributes where Odoo and Really Simple Systems differ
AttributeOdooReally Simple Systems
Starting priceFree$15/month
Free tierYesNo
PlatformsCloud, On-premise, Web, MobileWeb
CategoryERPCRM
Founded20022009

Identical on both: pricing model (subscription), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Odoo

  • Sales management
  • Inventory
  • Accounting
  • CRM
  • Project management
  • E-commerce
  • Email marketing
  • Payment gateways

Only in Really Simple Systems

  • Contact management
  • Sales pipeline
  • Task management
  • Email integration
  • Reporting
  • Zapier
  • Google Workspace
  • GDPR

Both cover

  • Web support

What people use each for

The jobs each tool is most often brought in to do.

Odoo

  • Running ERP, CRM, inventory and accounting from one integrated suitenot Really Simple Systems
  • Starting with a single business app and adding modules over timenot Really Simple Systems

Really Simple Systems

  • Sales managementnot Odoo
  • Contact trackingnot Odoo

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Odoo

  • The free plan is limited to one app, so any second module moves the whole account to a paid per user plan
  • Standard runs $13.50 to $16.90 per user per month and Custom $20.40 to $25.50, both quoted with a yearly discount applied
  • Implementation services and custom development are not included in any plan
  • Odoo.sh hosting is required for custom modules and is charged separately from the subscription
  • SMS credits and AI scanning are billed on top of the per user price

Really Simple Systems

  • The vendor's own pricing page as captured by the Internet Archive on 22 October 2019 listed four CRM tiers billed annually: Free at $0 for up to 2 users, Starter at $14 per user per month, Professional at $30 per user per month, and Enterprise at $46 per user per month (each roughly 7 to 10 percent higher if billed monthly); the Marketing add-on was $22 per month for up to 5,000 emails and Advanced Marketing scaled to 50,000 emails per month, though this capture is over five years old

Pricing, plan by plan

Odoo

Free
  • One App FreeFree
    • Unlimited users
    • One app included
    • Hosted on Odoo Online
  • Standard$13.5/month
    • All apps included
    • Odoo Online hosting
    • Unlimited support, hosting and maintenance
  • Custom$20.4/month
    • All apps, multi-company support
    • Odoo Studio access
    • External API access

Really Simple Systems

$15/month
  • Essential$15/month
    • Contact management
    • Task tracking
  • Professional$25/month
    • Everything in Essential
    • Sales pipeline
    • Reporting
  • Professional Plus$35/month
    • Everything in Professional
    • Advanced customization

Which should you pick?

Choose Odoo if

  • You need sales management.
  • You want to start without paying.
  • You work on Cloud, On-premise, Web, Mobile.
  • You also want inventory.
Odoo review

Choose Really Simple Systems if

  • You need contact management.
  • You also want sales pipeline.
Really Simple Systems review

Questions people ask

Is Odoo or Really Simple Systems better?
Neither clearly leads. Odoo starts at Free and Really Simple Systems at $15/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Odoo or Really Simple Systems?
Odoo has a free tier; the other does not. Paid plans start at Free for Odoo and $15/month for Really Simple Systems.
Does Odoo or Really Simple Systems run on more platforms?
Odoo runs on Cloud, On-premise, Web, Mobile. Really Simple Systems runs on Web.
Can I use Odoo for free?
Yes. Odoo has a free tier, so you can try it without paying. Really Simple Systems starts at $15/month.
What is Odoo best used for?
Odoo is most often used for running erp, crm, inventory and accounting from one integrated suite, starting with a single business app and adding modules over time. Of those, running erp, crm, inventory and accounting from one integrated suite and starting with a single business app and adding modules over time are not what Really Simple Systems is typically brought in for.
What can Odoo do that Really Simple Systems cannot?
Odoo covers Sales management, Inventory, Accounting, CRM. Really Simple Systems covers Contact management, Sales pipeline, Task management, Email integration. Both handle Web support.

Answered from the vendors’ own pages

Odoo: How much does Odoo cost per user?

Odoo pricing ranges from $0/month for one free app with unlimited users, to $13.50-$16.90/month per user for Standard, and $20.40-$25.50/month per user for Custom, depending on billing frequency (yearly vs monthly).

Source
Odoo: Is there a free Odoo plan?

Yes, Odoo offers a free plan that includes unlimited users for one app with hosting and support included on Odoo Online.

Source
Odoo: How does Odoo define a paying user?

A paying user is typically an employee who has access to the Odoo backend to create, view, or edit documents. Customers and suppliers accessing portals are free users and do not count toward the seat limit.

Source
Odoo: What is included in Odoo's Standard plan?

The Standard plan at $13.50-$16.90/user/month includes all Odoo apps, hosting, unlimited support and maintenance, daily backups, 24/7 monitoring and security, and free eLearning platform access.

Source
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