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ERP · head to head

ADempiere vs Unit4

ADempiere logo

ADempiere

ERP

Community-run open source ERP forked from Compiere, with no vendor behind it

From
Free
Rated
-
Full reviewWebsite
Unit4 logo

Unit4

ERP

ERP for people-based organisations where the cost centre structure keeps changing

From
$800/month
Rated
-
Full reviewWebsite

The short version

  • Only ADempiere has a free tier, so it costs nothing to try first.
  • Each has a real cost: ADempiere there is no company behind it, so there is no support contract to buy, no SLA, no escalation path and no roadmap commitment; if your implementation partner leaves the market you own the problem entirely.; Unit4 manufacturing, warehouse management and supply chain planning are not the point of this product, so a business with significant inventory will find capability gaps that no amount of configuration closes.
  • They diverge on capability: ADempiere covers Application dictionary, Unit4 covers Flexible organisational model.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which ADempiere and Unit4 actually diverge.

Attributes where ADempiere and Unit4 differ
AttributeADempiereUnit4
Starting priceFree$800/month
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsWeb, Windows, macOS, Linux, Self-hostedCloud, Web, Mobile
FoundedUnknown1987

Identical on both: user rating (Not yet rated), category (ERP).

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 ADempiere

  • Application dictionary
  • Financial accounting
  • Order to cash and procure to pay
  • Inventory and warehouse
  • Manufacturing
  • Point of sale
  • Workflow engine
  • Java and PostgreSQL stack

Only in Unit4

  • Flexible organisational model
  • Project and time accounting
  • Financial management
  • Procurement
  • Human resources
  • Planning and forecasting
  • Reporting
  • Grant and fund accounting

What people use each for

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

ADempiere

  • A manufacturer in Latin America with an existing ADempiere consulting partner that needs localised tax and accounting behaviour a global vendor will not buildnot Unit4
  • A company that wants to modify ERP screens and document workflows without a vendor change request, using the application dictionary rather than codenot Unit4
  • An organisation with a hard requirement to keep financial data on its own servers under its own control with no cloud dependencynot Unit4
  • A systems integrator building a vertical ERP product on a permissive base it can fork and ship without paying a licence feenot Unit4

Unit4

  • A university or public body whose funding structure and reporting hierarchy change more often than its accounting system can keep up withnot ADempiere
  • A professional services firm that needs time, project profitability and financials in one ledger rather than in three systemsnot ADempiere
  • A nonprofit or NGO accounting for restricted funds and reporting to donors on how each was spentnot ADempiere
  • An organisation going through a merger or restructure that needs comparative reporting across both the old and new structuresnot ADempiere

Where each one falls short

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

ADempiere

  • There is no company behind it, so there is no support contract to buy, no SLA, no escalation path and no roadmap commitment; if your implementation partner leaves the market you own the problem entirely.
  • The official website adempiere.net does not resolve, which strands most of the historic documentation and tutorials that search engines still point at and makes onboarding a new developer considerably harder.
  • The last conventional stable release, 3.9.4, is from January 2023, so despite ongoing GitHub activity a buyer evaluating on release cadence sees a project moving slowly.
  • iDempiere, a later fork of the same codebase, absorbed much of the developer community, so ADempiere competes for contributors with its own descendant and is the smaller of the two ecosystems.
  • The interface and the Java Swing heritage feel dated, and staff coming from a modern cloud ERP will need training and will complain; expect resistance from finance and warehouse users during rollout.

Unit4

  • Manufacturing, warehouse management and supply chain planning are not the point of this product, so a business with significant inventory will find capability gaps that no amount of configuration closes.
  • Payroll is generally handled by a separate product or a regional third party rather than being included, so multi-country organisations end up managing several payroll vendors alongside the ERP.
  • Moving from an established on premise Agresso installation to the current cloud product is closer to a re-implementation than an upgrade, with data migration, process redesign and retraining to pay for on a system that already worked.
  • The consulting and partner ecosystem is considerably smaller than for SAP, Oracle or Microsoft, so specialist skills are harder to hire, cost more, and are concentrated in a small number of firms with limited availability.
  • The flexibility that makes reorganisation cheap also makes it easy to build a model nobody understands, and an organisation that has reconfigured its hierarchy repeatedly without documentation ends up unable to explain its own reporting.

Pricing, plan by plan

ADempiere

Free
  • Community editionFree
    • GPL v2 licensed, no licence fee
    • Full ERP, CRM, supply chain and POS modules
    • Self-hosted on your own infrastructure

Unit4

$800/month
  • Professional Services$800/month
    • Project accounting
    • Resource management
    • Time tracking
  • Enterprise$2000/month
    • Advanced features
    • Multi-entity
    • Analytics

Which should you pick?

Choose ADempiere if

  • You need application dictionary.
  • You want to start without paying.
  • You work on Web, Windows, macOS, Linux, Self-hosted.
  • You also want financial accounting.
ADempiere review

Choose Unit4 if

  • You need flexible organisational model.
  • You work on Cloud, Web, Mobile.
  • You also want project and time accounting.
Unit4 review

Questions people ask

Is ADempiere or Unit4 better?
Neither clearly leads. ADempiere starts at Free and Unit4 at $800/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ADempiere or Unit4?
ADempiere has a free tier; the other does not. Paid plans start at Free for ADempiere and $800/month for Unit4.
Does ADempiere or Unit4 run on more platforms?
ADempiere runs on Web, Windows, macOS, Linux, Self-hosted. Unit4 runs on Cloud, Web, Mobile.
Can I use ADempiere for free?
Yes. ADempiere has a free tier, so you can try it without paying. Unit4 starts at $800/month.
What is ADempiere best used for?
ADempiere is most often used for a manufacturer in latin america with an existing adempiere consulting partner that needs localised tax and accounting behaviour a global vendor will not build, a company that wants to modify erp screens and document workflows without a vendor change request, using the application dictionary rather than code, an organisation with a hard requirement to keep financial data on its own servers under its own control with no cloud dependency, a systems integrator building a vertical erp product on a permissive base it can fork and ship without paying a licence fee. Of those, a manufacturer in latin america with an existing adempiere consulting partner that needs localised tax and accounting behaviour a global vendor will not build and a company that wants to modify erp screens and document workflows without a vendor change request, using the application dictionary rather than code are not what Unit4 is typically brought in for.
What can ADempiere do that Unit4 cannot?
ADempiere covers Application dictionary, Financial accounting, Order to cash and procure to pay, Inventory and warehouse. Unit4 covers Flexible organisational model, Project and time accounting, Financial management, Procurement.

Answered from the vendors’ own pages

ADempiere: Should I choose ADempiere or iDempiere?

Look at iDempiere first. It is a later fork of the same codebase with a more active community and a modular OSGi architecture. Choose ADempiere if a specific partner or localisation you need only exists there.

Unit4: Is Unit4 ERP the same thing as Agresso?

Yes, in lineage. Agresso is the earlier name for the same product line and long-standing customers still use it. Current marketing uses Unit4 ERP, and the cloud product is a substantially different deployment from the on premise Agresso installations still in service.

ADempiere: Is ADempiere free?

The software is GPL licensed with no licence fee. The cost is implementation, customisation and permanent in-house maintenance, which for a real deployment is substantial.

Unit4: Can it run a manufacturing business?

Not well. This product is built for organisations whose cost base is people and projects. If your planning problem is materials and production capacity, look at a manufacturing ERP instead.

ADempiere: Is the project still alive?

Development continues on GitHub with commits into 2026, but the official website is down and the last stable release is from January 2023. Treat it as maintained rather than actively advancing.

Unit4: What actually justifies the price against a mainstream ERP?

The cost of change. If your structure is stable, the flexibility is worth little and a mainstream product is cheaper. If you reorganise regularly and each reorganisation currently means a consultancy engagement, that recurring cost is where the business case sits.

ADempiere: What is the application dictionary?

It is the metadata layer inherited from Compiere that stores the definition of every window, field and validation rule as data, so you can change the application without touching source code.

Unit4: Is it sold direct or through partners?

Both. Unit4 sells and implements direct in its main markets and also works with partners. Ask which model applies to your region and country, because it determines who is accountable when the implementation slips.

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