Accounting · head to head
Causal vs IRIS KashFlow
Causal
Accounting
Formula-based financial planning and modelling, now sold as Lucanet xP&A
- From
- On request
- Rated
- -
IRIS KashFlow
Accounting
Online accounting software for UK sole traders and small businesses
- From
- £13.5/month
- 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.; IRIS KashFlow advertised monthly prices of £1.35 (Starter) and £2.75 (Business) are a 90% promotional discount off the standard £13.50 and £27.50 rates, and the promotion is described as lasting 6 months before reverting
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Causal and IRIS KashFlow actually diverge.
| Attribute | Causal | IRIS KashFlow |
|---|---|---|
| Starting price | On request | £13.5/month |
| Pricing model | quote | subscription |
Identical on both: free tier (No), platforms (Web), 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 IRIS KashFlow
Nothing recorded that Causal does not also cover.
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 IRIS KashFlow
- A company that needs to show a range of outcomes rather than a single forecast, with uncertainty modelled directly in the driversnot IRIS KashFlow
- 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 IRIS KashFlow
- A group already running Lucanet for consolidation and reporting that wants planning on the same platform rather than a separate toolnot IRIS KashFlow
IRIS KashFlow
- business accountingnot Causal
- invoicing and billingnot Causal
- VAT managementnot 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.
IRIS KashFlow
- Advertised monthly prices of £1.35 (Starter) and £2.75 (Business) are a 90% promotional discount off the standard £13.50 and £27.50 rates, and the promotion is described as lasting 6 months before reverting
- Listed prices are in GBP plus VAT, and the platform's plans are built around UK VAT filing rather than other tax regimes
- Annual pricing is quoted at RRP £162/year (Starter) and £291.50/year (Business) before the same promotional reduction
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
IRIS KashFlow
£13.5/month- Starter Monthly$13.5/month
- 10 invoices
- up to 25 bank transactions
- single user access
- Business Monthly$27.5/month
- unlimited invoices
- unlimited bank transactions
- multi-user access
- Starter Annual$162/year
- 10 invoices
- up to 25 bank transactions
- single user access
- Business Annual$291.5/year
- unlimited invoices
- unlimited bank transactions
- multi-user access
Which should you pick?
Choose Causal if
- You need variable-based modelling.
- You also want dimensional breakdowns.
Choose IRIS KashFlow if
Nothing in the data separates IRIS KashFlow from Causal on the points above - pick on price and on how each one feels to use.
Questions people ask
- Is Causal or IRIS KashFlow better?
- Neither clearly leads. Causal starts at On request and IRIS KashFlow at £13.5/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Causal or IRIS KashFlow?
- Causal starts at On request and IRIS KashFlow at £13.5/month.
- Does Causal or IRIS KashFlow run on more platforms?
- Both run on Web, so platform support will not decide this one for you.
- 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 IRIS KashFlow is typically brought in for.
- What can Causal do that IRIS KashFlow cannot?
- Causal covers Variable-based modelling, Dimensional breakdowns, Scenario and range inputs, Actuals integration.
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.
IRIS KashFlow: What are IRIS KashFlow's core features across all plans?
All IRIS KashFlow plans include unlimited quotes, online VAT submission, mobile app access, 50+ reports, bank feeds, receipt capture, multi-currency support, and payroll for up to 5 employees.
SourceCausal: 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.
IRIS KashFlow: Are there promotional discounts for new IRIS KashFlow customers?
Yes, new customers receive a 90% discount for 6 months on both Starter and Business monthly plans.
SourceCausal: 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.
IRIS KashFlow: Can multiple users access IRIS KashFlow on the Starter plan?
No, the Starter plan is limited to single-user access only. Multi-user access requires the Business plan.
SourceCausal: 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.
Related pages
More on IRIS KashFlow
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