Accounting · head to head
Causal vs Medius
Causal
Accounting
Formula-based financial planning and modelling, now sold as Lucanet xP&A
- From
- On request
- Rated
- -
Medius
Accounting
Accounts payable automation and supplier payments for mid-market finance teams, Marlin Equity owned
- From
- On request
- Rated
- -
The short version
- Each has a real cost: Causal causal was acquired by Lucanet on 31 October 2024 and the independent brand has been retired in favour of Lucanet xP&A, so the roadmap, support and pricing you buy are Lucanet’s and not the ones the product built its reputation on.; Medius the sourcing, contract and procurement modules are considerably less developed than the AP core, so buying Medius as a full source-to-pay suite means accepting weak upstream tooling.
- They diverge on capability: Causal covers Variable-based modelling, Medius covers Invoice capture and coding.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Causal and Medius actually diverge.
Identical on both: starting price (On request), pricing model (quote), free tier (No), user rating (Not yet rated), category (Accounting).
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 Causal
- Variable-based modelling
- Dimensional breakdowns
- Scenario and range inputs
- Actuals integration
- Interactive dashboards
- Version history
- Spreadsheet import
- Workforce and headcount planning
Only in Medius
- Invoice capture and coding
- Matching and exception handling
- Fraud and anomaly detection
- Supplier payments
- Approval workflow
- ERP integration
What people use each for
The jobs each tool is most often brought in to do.
Causal
- A finance team whose three-statement Excel model has become too fragile to change safely before every board meetingnot Medius
- A company that needs to show a range of outcomes rather than a single forecast, with uncertainty modelled directly in the driversnot Medius
- A budget owner outside finance who should adjust hiring or spend assumptions and see the effect without being given edit access to the master spreadsheetnot Medius
- A group already running Lucanet for consolidation and reporting that wants planning on the same platform rather than a separate toolnot Medius
Medius
- A mid-market finance team where most spend arrives as an invoice with no purchase order to match againstnot Causal
- A group with several legal entities on different ERPs that wants one AP process across all of themnot Causal
- Reducing invoice fraud exposure with automated detection of supplier bank detail changesnot Causal
- Replacing a scanning bureau and a shared AP inbox with automated capture and exception-based reviewnot Causal
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Causal
- Causal was acquired by Lucanet on 31 October 2024 and the independent brand has been retired in favour of Lucanet xP&A, so the roadmap, support and pricing you buy are Lucanet’s and not the ones the product built its reputation on.
- Self-serve pricing is gone: the old causal.app pricing page now redirects to a Lucanet solution page, so what was a transparent product you could sign up for is an enterprise sales conversation with no published rate.
- The variable-based model is a genuine departure from spreadsheet thinking, so an accountant fluent in Excel must relearn how to express a model, and the team members who could previously all edit the forecast often cannot at first.
- Deep Excel compatibility is limited by design; complex existing workbooks with macros, circular references or heavy lookups do not import cleanly and have to be rebuilt, which turns a tool evaluation into a modelling project.
- Consolidation, statutory reporting and multi-entity currency handling are weaker than in dedicated corporate performance management suites, so a group with several legal entities usually needs Lucanet’s other modules alongside it, raising the real cost well past the planning tool alone.
Medius
- The sourcing, contract and procurement modules are considerably less developed than the AP core, so buying Medius as a full source-to-pay suite means accepting weak upstream tooling.
- Pricing is quote-only and driven by invoice volume, so a business with many low-value invoices pays disproportionately relative to the spend being controlled.
- Payments are billed on transaction volume separately from the AP subscription, which is easy to omit from a cost comparison against a licence-only AP tool.
- Private equity ownership since 2017 has produced an acquisition-driven product line, so payments and adjacent capability come from bought-in technology rather than the original platform.
- ERP integration depth varies sharply by system, and organisations on less common or heavily customised ERPs face integration work that lengthens the implementation.
Pricing, plan by plan
Causal
On request- Lucanet xP&A (formerly Causal)$undefined/year
- Variable-based planning models with dimensions and scenarios
- Actuals integration from accounting, CRM and warehouse sources
- Interactive dashboards for non-finance stakeholders
Medius
On request- Medius AP Automation$undefined/year
- Two packaged AP automation tiers
- Priced by invoice volume and entity count
- Sourcing, contracts and procurement modules sold separately
Which should you pick?
Choose Causal if
- You need variable-based modelling.
- You also want dimensional breakdowns.
Choose Medius if
- You need invoice capture and coding.
- You work on Web, iOS, Android.
- You also want matching and exception handling.
Questions people ask
- Is Causal or Medius better?
- Neither clearly leads. Causal starts at On request and Medius at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Causal or Medius?
- Causal starts at On request and Medius at On request.
- Does Causal or Medius run on more platforms?
- Causal runs on Web. Medius runs on Web, iOS, Android.
- What is Causal best used for?
- Causal is most often used for a finance team whose three-statement excel model has become too fragile to change safely before every board meeting, a company that needs to show a range of outcomes rather than a single forecast, with uncertainty modelled directly in the drivers, a budget owner outside finance who should adjust hiring or spend assumptions and see the effect without being given edit access to the master spreadsheet, a group already running lucanet for consolidation and reporting that wants planning on the same platform rather than a separate tool. Of those, a finance team whose three-statement excel model has become too fragile to change safely before every board meeting and a company that needs to show a range of outcomes rather than a single forecast, with uncertainty modelled directly in the drivers are not what Medius is typically brought in for.
- What can Causal do that Medius cannot?
- Causal covers Variable-based modelling, Dimensional breakdowns, Scenario and range inputs, Actuals integration. Medius covers Invoice capture and coding, Matching and exception handling, Fraud and anomaly detection, Supplier payments.
Answered from the vendors’ own pages
Causal: Does Causal still exist?
The product does, as Lucanet xP&A. The independent Causal brand and self-serve offering have been retired following the October 2024 acquisition.
Medius: Is Medius a procurement suite or an AP tool?
Primarily an AP automation platform with procurement modules attached. If sourcing is your main requirement, look elsewhere.
Causal: What does it cost now?
Nothing is published. The former pricing page redirects to Lucanet, and the product is quoted as part of the Lucanet CFO Solution Platform.
Medius: Who owns Medius?
Marlin Equity Partners, which acquired it in 2017 and has funded several bolt-on acquisitions since.
Causal: Can I import my existing Excel model?
Simple workbooks import. Models with macros, circular references or heavy lookup chains have to be rebuilt around named variables, which is the real migration cost.
Medius: How is it priced?
By quote, driven by invoice volume and entity count, with payments billed separately on transaction volume.
Causal: Is it a replacement for a consolidation tool?
No. It plans and forecasts. Statutory consolidation and multi-entity reporting sit in Lucanet’s other modules.
Medius: Does it replace our ERP?
No. It sits alongside the ERP and posts approved invoices into it.
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