Softwr

Accounting · head to head

Brex vs IRIS KashFlow

Brex logo

Brex

Accounting

The financial stack for growing businesses

From
Free
Rated
-
Full reviewWebsite
IRIS KashFlow logo

IRIS KashFlow

Accounting

Online accounting software for UK sole traders and small businesses

From
£13.5/month
Rated
-
Full reviewWebsite

The short version

  • Only Brex has a free tier, so it costs nothing to try first.
  • Each has a real cost: Brex the free Essentials tier is limited to two legal entities; 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 30 August 2026.

Where they differ

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

Attributes where Brex and IRIS KashFlow differ
AttributeBrexIRIS KashFlow
Starting priceFree£13.5/month
Free tierYesNo
PlatformsWeb, Ios, AndroidWeb
Founded2017Unknown

Identical on both: pricing model (subscription), 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 Brex

  • Corporate cards
  • Business accounts
  • Expense management
  • Bill pay
  • Travel
  • QuickBooks
  • NetSuite
  • Xero

Only in IRIS KashFlow

Nothing recorded that Brex does not also cover.

What people use each for

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

Brex

  • Corporate cards with spend controls for startupsnot IRIS KashFlow
  • Expense management and reimbursementsnot IRIS KashFlow
  • Travel booking inside the spend platformnot IRIS KashFlow
  • Bill pay and accounting system syncnot IRIS KashFlow
  • Multi-entity spend management on the paid tiersnot IRIS KashFlow

IRIS KashFlow

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

Where each one falls short

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

Brex

  • The free Essentials tier is limited to two legal entities
  • Premium is $12 per user per month, so cost scales with headcount using the card
  • Enterprise and Smart Card pricing is not published
  • Eligibility criteria are not stated anywhere on the pricing page, which matters for a product that extends credit

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

Brex

Free
  • EssentialsFree
    • Global card acceptance
    • Accounting integrations
    • Real-time reporting
  • Premium$12/month
    • per user
    • Custom expense policies
    • Dynamic approval chains
  • Enterprise$null/month
    • Custom pricing

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 Brex if

  • You need corporate cards.
  • You want to start without paying.
  • You work on Web, Ios, Android.
  • You also want business accounts.
Brex review

Choose IRIS KashFlow if

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

IRIS KashFlow review

Questions people ask

Is Brex or IRIS KashFlow better?
Neither clearly leads. Brex starts at Free 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, Brex or IRIS KashFlow?
Brex has a free tier; the other does not. Paid plans start at Free for Brex and £13.5/month for IRIS KashFlow.
Does Brex or IRIS KashFlow run on more platforms?
Brex runs on Web, Ios, Android. IRIS KashFlow runs on Web.
Can I use Brex for free?
Yes. Brex has a free tier, so you can try it without paying. IRIS KashFlow starts at £13.5/month.
What is Brex best used for?
Brex is most often used for corporate cards with spend controls for startups, expense management and reimbursements, travel booking inside the spend platform, bill pay and accounting system sync. Of those, corporate cards with spend controls for startups and expense management and reimbursements are not what IRIS KashFlow is typically brought in for.
What can Brex do that IRIS KashFlow cannot?
Brex covers Corporate cards, Business accounts, Expense management, Bill pay.

Answered from the vendors’ own pages

Brex: Does Brex have a free plan?

Yes. Brex Essentials is free for startups and growing companies and includes global card acceptance, AI-powered rules, accounting integrations, real-time reporting, and bill pay.

Source
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
Brex: What is Brex Premium pricing?

Brex Premium costs $12 per user per month and is designed for mid-sized companies. It adds custom expense policies, dynamic approval chains, AI compliance auditing, multi-entity support, and live budgets.

Source
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
Brex: What countries accept Brex cards?

Brex cards are accepted in 210+ countries. The Smart Card plan offers local-currency cards in 50+ countries for companies focused on procurement simplification and international payments.

Source
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
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