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Accounting · head to head

IRIS KashFlow vs Medius

IRIS KashFlow logo

IRIS KashFlow

Accounting

Online accounting software for UK sole traders and small businesses

From
£13.5/month
Rated
-
Full reviewWebsite
Medius logo

Medius

Accounting

Accounts payable automation and supplier payments for mid-market finance teams, Marlin Equity owned

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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; 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.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which IRIS KashFlow and Medius actually diverge.

Attributes where IRIS KashFlow and Medius differ
AttributeIRIS KashFlowMedius
Starting price£13.5/monthOn request
Pricing modelsubscriptionquote
PlatformsWebWeb, iOS, Android

Identical on both: 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 IRIS KashFlow

Nothing recorded that Medius does not also cover.

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.

IRIS KashFlow

  • business accountingnot Medius
  • invoicing and billingnot Medius
  • VAT managementnot Medius

Medius

  • A mid-market finance team where most spend arrives as an invoice with no purchase order to match againstnot IRIS KashFlow
  • A group with several legal entities on different ERPs that wants one AP process across all of themnot IRIS KashFlow
  • Reducing invoice fraud exposure with automated detection of supplier bank detail changesnot IRIS KashFlow
  • Replacing a scanning bureau and a shared AP inbox with automated capture and exception-based reviewnot IRIS KashFlow

Where each one falls short

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

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

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

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

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 IRIS KashFlow if

Nothing in the data separates IRIS KashFlow from Medius on the points above - pick on price and on how each one feels to use.

IRIS KashFlow review

Choose Medius if

  • You need invoice capture and coding.
  • You work on Web, iOS, Android.
  • You also want matching and exception handling.
Medius review

Questions people ask

Is IRIS KashFlow or Medius better?
Neither clearly leads. IRIS KashFlow starts at £13.5/month and Medius at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, IRIS KashFlow or Medius?
IRIS KashFlow starts at £13.5/month and Medius at On request.
Does IRIS KashFlow or Medius run on more platforms?
IRIS KashFlow runs on Web. Medius runs on Web, iOS, Android.
What is IRIS KashFlow best used for?
IRIS KashFlow is most often used for business accounting, invoicing and billing, vat management. Of those, business accounting and invoicing and billing are not what Medius is typically brought in for.
What can IRIS KashFlow do that Medius cannot?
Medius covers Invoice capture and coding, Matching and exception handling, Fraud and anomaly detection, Supplier payments.

Answered from the vendors’ own pages

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.

Source
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.

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.

Source
Medius: Who owns Medius?

Marlin Equity Partners, which acquired it in 2017 and has funded several bolt-on acquisitions since.

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.

Source
Medius: How is it priced?

By quote, driven by invoice volume and entity count, with payments billed separately on transaction volume.

Medius: Does it replace our ERP?

No. It sits alongside the ERP and posts approved invoices into it.

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