Softwr

Accounting · head to head

Billin vs Polar

Billin logo

Billin

Accounting

Spanish online invoicing software for freelancers and small businesses

From
€6.6/month
Rated
-
Full reviewWebsite
Polar logo

Polar

Accounting

Billing and revenue platform for AI and infrastructure companies

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Polar has a free tier, so it costs nothing to try first.
  • 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; Polar percentage-based fees higher than some specialized processors for high-volume transactions
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Billin and Polar actually diverge.

Attributes where Billin and Polar differ
AttributeBillinPolar
Starting price€6.6/monthFree
Pricing modelsubscriptionPercentage of transaction plus per-transaction fee
Free tierNoYes
PlatformsWebWeb, API

Identical on both: 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 Billin

Nothing recorded that Polar does not also cover.

Only in Polar

  • Usage Billing
  • Subscriptions
  • Seat Management
  • Prepaid Credits
  • Hosted Checkout
  • Cost Insights
  • Merchant of Record

What people use each for

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

Billin

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

Polar

  • Billing for token and API call consumption by LLM applicationsnot Billin
  • Managing tiered pricing for infrastructure usage-based servicesnot Billin
  • Handling subscription and usage hybrid modelsnot Billin
  • Monetizing AI APIs with usage metering and creditsnot 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

Polar

  • Percentage-based fees higher than some specialized processors for high-volume transactions
  • Merchant of record model may not suit companies preferring direct payment control
  • Free Starter tier limited with 5% fees reducing appeal for production use
  • Setup and integration effort required despite API simplicity

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

Polar

Free
  • StarterFree
    • 5% + $0.50 per transaction
    • Free tier for testing
    • Basic features
  • Pro$20/month
    • 3.8% + $0.40 per transaction
    • Full platform access
    • Cost insights
  • Growth$100/month
    • 3.6% + $0.35 per transaction
    • Priority support
    • Volume benefits
  • Scale$400/month
    • 3.4% + $0.30 per transaction
    • Dedicated support
    • Custom integration

Which should you pick?

Choose Billin if

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

Billin review

Choose Polar if

  • You need usage billing.
  • You want to start without paying.
  • You work on Web, API.
  • You also want subscriptions.
Polar review

Questions people ask

Is Billin or Polar better?
Neither clearly leads. Billin starts at €6.6/month and Polar at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Billin or Polar?
Polar has a free tier; the other does not. Paid plans start at €6.6/month for Billin and Free for Polar.
Does Billin or Polar run on more platforms?
Billin runs on Web. Polar runs on Web, API.
Can I use Polar for free?
Yes. Polar has a free tier, so you can try it without paying. Billin starts at €6.6/month.
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 Polar is typically brought in for.
What can Billin do that Polar cannot?
Polar covers Usage Billing, Subscriptions, Seat Management, Prepaid Credits.

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
Polar: Do you handle international payments and taxes?

Yes, Polar acts as merchant of record in 100+ markets, handling payment processing, tax collection, and compliance automatically.

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
Polar: Is there a free tier?

Yes, the Starter plan is free and charges 5% + $0.50 per transaction, ideal for testing and early-stage development.

Source
Billin: How many users does each Billin plan include?

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

Source
Polar: Do you offer discounts for startups?

Yes, the Startup Program provides the Scale plan free for 12 months for early-stage AI companies.

Source
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