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Accounting · head to head

Billin vs IRIS KashFlow

Billin logo

Billin

Accounting

Spanish online invoicing software for freelancers and small businesses

From
€6.6/month
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

  • Each has a real cost: Billin plan Basico caps usage at just 5 clients, 1 user and 10 products for EUR 6.60/month, well below what most active small businesses need; 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 29 August 2026.

Where they differ

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

Attributes where Billin and IRIS KashFlow differ
AttributeBillinIRIS KashFlow
Starting price€6.6/month£13.5/month

Identical on both: pricing model (subscription), free tier (No), platforms (Web), user rating (Not yet rated), category (Accounting).

What people use each for

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

Billin

  • Invoice managementnot IRIS KashFlow
  • Multi-user accounting for freelancers and small businessesnot IRIS KashFlow

IRIS KashFlow

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

Where each one falls short

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

Billin

  • Plan Basico caps usage at just 5 clients, 1 user and 10 products for EUR 6.60/month, well below what most active small businesses need
  • Plan Pro still caps clients at 50 and users at 3 for EUR 14/month, so any business with more clients must move to the unlimited EUR 23/month tier

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

Billin

€6.6/month
  • Plan Básico$80/year
    • 0-5 clients
    • 1 user
    • Max 10 products
  • Plan Básico$96/month
  • Plan Pro$168/year
    • 6-50 clients
    • 3 users
    • Max 50 products
  • Plan Pro$204/month

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 Billin if

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

Billin review

Choose IRIS KashFlow if

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

IRIS KashFlow review

Questions people ask

Is Billin or IRIS KashFlow better?
Neither clearly leads. Billin starts at €6.6/month 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, Billin or IRIS KashFlow?
Billin starts at €6.6/month and IRIS KashFlow at £13.5/month.
Does Billin or IRIS KashFlow run on more platforms?
Both run on Web, so platform support will not decide this one for you.
What is Billin best used for?
Billin is most often used for invoice management, multi-user accounting for freelancers and small businesses. Of those, invoice management and multi-user accounting for freelancers and small businesses are not what IRIS KashFlow is typically brought in for.

Answered from the vendors’ own pages

Billin: What are Billin's plan costs?

Billin offers three plans: Básico at €80/year (€6.60/month), Pro at €168/year (€14/month), and Ilimitado at €276/year (€23/month). Annual billing includes 18% savings compared to monthly.

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
Billin: Is there a free trial for Billin?

Yes, Billin offers a 30-day free trial with all features included. No credit card is required to start.

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
Billin: How many users does each Billin plan include?

Básico includes 1 user, Pro includes 3 users, and Ilimitado includes unlimited users.

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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