Order-to-cash, evaluated honestly

The free SAP alternative for order-to-cash that every list skips

Search this question and you get a wall of paid AR software dressed up as a free alternative. None of it is free. This page gives the honest answer: the only genuinely free options are open-source ERPs and an open-source automation SDK, and for most teams the faster win is to stop paying for the order-to-cash labor, not the SAP license.

Direct answer (verified 2026-06-16)

There is no free drop-in replacement for SAP's order-to-cash. Every product the roundups name (Invoiced, Billtrust, HighRadius, Gaviti, Oracle Order Management, NetSuite, Sage Intacct) is paid SaaS with quote-based or per-seat pricing. There are exactly two genuinely free routes:

Open-source ERPs. ERPNext (GPLv3), Odoo Community Edition (LGPLv3), and Dolibarr (GPLv3) run an order-to-cash cycle at no license cost, but each is a full ERP cutover.
Automate the labor, keep the ledger. The cost you are actually fighting is the keystrokes between systems. Mediar's Terminator SDK is MIT-licensed and free to run on your own machine; it automates order, invoice, and cash steps on whatever ledger you already have, SAP included.

Why the lists all point at paid products

Order-to-cash is a process, not a single application. It spans the sales order, the shipment, the invoice, and the cash that finally lands and has to be matched back to the invoice. The roundups that rank for this question conflate "alternative to SAP" with "accounts-receivable automation suite," then quietly drop the word free once you reach the pricing page. Most offer a trial, not a free tier. The well-known cash-application and collections tools are sold to finance departments at enterprise prices.

So the useful question is not "which free suite replaces SAP" but "what am I actually paying for in order-to-cash." If it is the SAP license, an open-source ERP is the honest free answer and it is a migration. If it is the human labor of moving orders, invoices, and payments between screens, that is automatable for free without buying or migrating anything.

What each "free SAP alternative" actually costs

The honest version of the comparison table every roundup hides behind a trial signup.

Feature	Named alternatives	Mediar (open-source SDK)
Invoiced, Billtrust, HighRadius, Gaviti (AR / cash-application suites)	Paid SaaS, quote-based or per-seat. No free tier for production volume.	Free to start. The MIT Terminator SDK automates the same cash-application keystrokes on top of your existing ledger.
Oracle Order Management, NetSuite, Sage Intacct (full ERP replacement)	Paid, per-user subscription plus implementation. A multi-quarter migration off SAP.	No migration. Keep your ledger of record; automate only the order, invoice, and cash steps that burn labor.
ERPNext, Odoo Community, Dolibarr (open-source ERP)	Genuinely free (GPL / LGPL), but a full ERP cutover and you still re-key between systems.	Complements them. Drives order entry and reconciliation across whichever ERP plus the legacy apps with no API.
License model	Per-bot / per-seat / per-transaction metering once you leave the free trial.	$0 to run the open-source SDK on your own machine. Managed runtime is $0.75 per minute, no per-seat fee.
Works on SAP GUI and green-screen apps with no API	API-first AR tools need a connector SAP often does not expose for O2C steps.	Reads what the app exposes through OS accessibility APIs, the same interface screen readers use. No API required.

Open-source ERPs are genuinely free but are a full cutover. Mediar's managed runtime is paid ($0.75/min); the SDK itself is free under MIT.

The genuinely free piece, and where to verify it

The automation engine that drives order-to-cash steps on legacy desktop apps is open source. The license file in the repo says MIT on line one. You can clone it, run it on your own Windows machine, and never pay Mediar a cent for the engine itself. The managed runtime, the audit logs, and the SOC 2 environment are what the paid rate covers.

github.com/mediar-ai/terminator

Where the labor actually lives: the three O2C steps

Free AR tools sit downstream of the order. The recurring cost is upstream, at the keyboard, on the three steps below. This is the part no paid suite eliminates without charging you for it, and the part the open-source SDK can drive on the ERP you already run.

Order capture

A PO arrives as a PDF or email. Someone keys it into the sales-order screen by hand. This is where free AR tools cannot help: they sit downstream of the order, not at the keyboard.

Mediar reads the PDF and types the line items straight into the order screen, whether that screen is SAP GUI, Oracle EBS, or an open-source ERP. No connector, no API. The same workflow the operator does, watched once and replayed.

Invoice posting

The order ships, an invoice has to be posted against it. A wrong amount here is a financial error, not a cosmetic one, so the agent must never guess and never silently retry.

This is exactly why the executor separates infrastructure failures from business-logic failures. A posting that fails validation stops for human review. A dropped network connection retries. The two are not treated the same.

Cash application

A payment lands, it has to be matched to the open invoice and the remittance reconciled. This is the single most repetitive O2C task and the one paid suites charge the most to automate.

The match logic runs against the open-AR view you already have. There is no second ledger to license. When the layout of the cash-application screen changes, the agent re-reads the accessibility tree instead of breaking on a moved pixel.

The one thing that makes this safe for accounts receivable

Before any agent touches an invoice, you need a guarantee that a business-logic error never silently retries. A flaky network should retry. A rejected posting should not. The executor encodes exactly that distinction, and you can read it in one file.

crates/executor/src/config/retry.rs

The code splits failures into two categories. ErrorCategory::Infrastructure (VM down, network dropped, runtime unreachable) is retried automatically: max_infrastructure_retries defaults to 3, with a 30-second initial delay that doubles each attempt and caps at 600 seconds.

ErrorCategory::WorkflowLogic (a validation error, a business-logic rejection, a step that did not do what it should) is documented in the source, verbatim, as "SHOULD NOT be retried automatically." A bad invoice posting halts for a human. It does not loop.

70% lower

“We moved an F&B chain running SAP Business One off UiPath onto Mediar. Their CFO told the board they are now saving 70 percent on automation costs, on the same order-to-cash workflows.”

Mediar deployment, F&B chain on SAP B1

When replacing SAP is the right call anyway

None of this means keep SAP forever. If your team is small, your processes are standard, and the SAP license is the dominant line on the budget, migrating to an open-source ERP like ERPNext or Odoo Community is the honest free answer, and the automation layer comes along to that new ERP unchanged. The keystroke labor exists no matter which ledger you land on.

But a full ERP migration is a multi-quarter project with real risk. For most teams running order-to-cash on SAP today, the faster and cheaper move is to stop paying for the labor first: automate the order, invoice, and cash steps for free with the open-source SDK, measure what it saves, and decide on the ledger migration later with data instead of a sales deck.

Bring one order-to-cash workflow. We will automate it on your current SAP, free SDK first.

A 30-minute call where we watch one of your real O2C steps run once, then show it executing through accessibility APIs on the same SAP screen. No migration, no slides, the actual open-source runtime.

Frequently asked questions

Is there actually a free alternative to SAP for order-to-cash?

Not as a drop-in replacement. The products every roundup names as 'SAP alternatives for O2C' (Invoiced, Billtrust, HighRadius, Gaviti, Oracle Order Management, NetSuite, Sage Intacct) are all commercial SaaS with quote-based or per-seat pricing, not free. There are two genuinely free routes. First, open-source ERPs: ERPNext (GPLv3), Odoo Community Edition (LGPLv3), and Dolibarr (GPLv3) all run an order-to-cash cycle at no license cost, but each is a full ERP cutover. Second, and faster, keep your current ledger and automate just the order, invoice, and cash keystrokes with an open-source automation SDK. Mediar's Terminator SDK is MIT-licensed and free to run on your own machine; you only pay if you run it on Mediar's managed runtime.

Why do all the 'best free O2C software' lists point at paid products?

Because order-to-cash is a process, not a single tool, and the products that automate it are sold to finance departments at enterprise prices. The lists conflate 'alternative to SAP' with 'AR automation suite' and quietly drop the word 'free' once you reach the pricing page. Most of them offer a trial, not a free tier. If your real goal is to stop paying for the O2C labor rather than the SAP license, the cost you are fighting is the human keystrokes between systems, and that is automatable without buying another suite.

What does Mediar replace, if not SAP itself?

It replaces the manual data entry inside order-to-cash, and it replaces enterprise RPA tools (UiPath, Automation Anywhere, Power Automate) that try to do the same job with brittle selectors and pixel matching. Your ledger of record stays. SAP, Oracle, or an open-source ERP keeps being the system of truth. Mediar is the layer that watches an operator run an order entry or a cash match once, then executes that workflow through Windows accessibility APIs. There is no rip-and-replace and no second ledger to reconcile.

How is the open-source Terminator SDK free if Mediar charges $0.75 per minute?

The SDK at github.com/mediar-ai/terminator is MIT-licensed. You can clone it, run it on your own Windows machine, and automate O2C steps for nothing beyond your own hardware. The $0.75-per-minute rate is for the managed runtime: hosted execution, audit logs, retries, and the SOC 2 environment that finance and IT want for a production process. The code that drives SAP GUI is the same in both; you pay for the operations layer, not the automation engine.

What stops an automated invoice posting from going wrong at scale?

The executor classifies every failure before deciding whether to retry. In crates/executor/src/config/retry.rs, an ErrorCategory::Infrastructure failure (the VM is down, the network dropped, the runtime is unreachable) is retried automatically, up to max_infrastructure_retries which defaults to 3, with a 30-second initial delay that doubles each attempt and caps at 600 seconds. An ErrorCategory::WorkflowLogic failure (a validation error, a business-logic rejection, a step that did not do what it should) is explicitly marked SHOULD NOT be retried automatically. A bad invoice posting halts for a human instead of silently re-running, which is the property you need before letting any agent near accounts receivable.

Does this work on SAP GUI, or only on modern web apps?

SAP GUI specifically, plus Oracle EBS, mainframe green-screens, and the banking and healthcare cores (Jack Henry, Fiserv, FIS, Epic, Cerner) that browser-based AI agents cannot touch. The approach reads what an app exposes through OS-level accessibility APIs, the same interfaces a screen reader uses, so it does not need an API or a published integration. That is the entire reason the accessibility-API approach exists: it is the part of order-to-cash that lives on legacy desktop systems with no other way in.

If I move to a free open-source ERP, do I still need Mediar?

Often yes, for a different reason. Migrating from SAP to ERPNext or Odoo Community removes the license cost, but the order-to-cash cycle still has manual steps: keying a PO that arrives as a PDF, reconciling a payment against an open invoice, copying data between the new ERP and the systems you did not migrate. Those keystrokes are the recurring labor cost, and they exist regardless of which ledger you run. Mediar automates them across whatever ERP plus the legacy apps that never get migrated.

Adjacent pages on SAP automation and the economics of it