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Accounting · head to head

Mercury vs Starling Bank

Mercury logo

Mercury

Accounting

Banking for startups

From
Free
Rated
-
Full reviewWebsite
Starling Bank logo

Starling Bank

Personal Finance

UK-licensed digital bank with FSCS-protected deposits, built and majority-owned without a US parent

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Mercury treasury access requires a $250,000 balance held with Mercury; Starling Bank as a UK-only bank, customers wanting broad multi-currency holding, international transfers or in-app investing will need a separate product, since Starling's feature set stays deliberately focused on core banking.
  • They diverge on capability: Mercury covers Business checking, Starling Bank covers FSCS-protected deposits.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Mercury and Starling Bank actually diverge.

Attributes where Mercury and Starling Bank differ
AttributeMercuryStarling Bank
Pricing modelfreemiumFree personal current account; business accounts have free and paid tiers
PlatformsWeb, Ios, AndroidiOS, Android, Web
CategoryAccountingPersonal Finance
Founded2019Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 Mercury

  • Business checking
  • Savings accounts
  • Virtual cards
  • Team management
  • API access
  • QuickBooks
  • Xero
  • Stripe

Only in Starling Bank

  • FSCS-protected deposits
  • Business banking suite
  • Fee-free foreign card spending
  • Savings Spaces
  • Joint accounts
  • Starling mortgages

What people use each for

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

Mercury

  • Business banking and payments for startupsnot Starling Bank
  • Managing treasury, invoicing and corporate cards from one accountnot Starling Bank

Starling Bank

  • A UK resident wanting a free, fully licensed current account with FSCS deposit protectionnot Mercury
  • A sole trader or small business wanting a business account with built-in invoicing rather than a separate accounting subscriptionnot Mercury
  • A frequent traveller wanting fee-free card spending abroad on a UK-regulated accountnot Mercury
  • A saver wanting goal-based Spaces sub-accounts without opening a separate savings productnot Mercury

Where each one falls short

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

Mercury

  • Treasury access requires a $250,000 balance held with Mercury
  • Non USD international wires carry a 1% conversion fee
  • Choosing OUR wire coding, which covers intermediary bank charges, costs $15 per wire
  • ACH invoicing is $1 per transaction on Mercury Plus and only free on the $299 a month Pro plan
  • Advanced and recurring invoicing require Mercury Plus at $29.90 a month

Starling Bank

  • As a UK-only bank, customers wanting broad multi-currency holding, international transfers or in-app investing will need a separate product, since Starling's feature set stays deliberately focused on core banking.
  • Business account paid tiers add a monthly fee for features that some competitors bundle for free, so cost comparison against other business banking options should account for the tier actually needed, not the free entry point.
  • Like other app-first banks, Starling has very limited physical presence, which is a real limitation for customers needing to deposit cash or prefer in-person service.
  • Mortgage lending is limited to buy-to-let through a subsidiary rather than a full residential mortgage range, so it is not a one-stop option for a typical homebuyer.
  • Interest rates on savings Spaces and any lending products are set individually and can change, so the specific rate should be checked at the time of opening rather than assumed from marketing.

Pricing, plan by plan

Mercury

Free
  • Mercury (Free)Free
    • ACH payments
    • Domestic wires
    • Real-time payments
  • Mercury Plus$29.9/month
    • Invoice ACH debits
    • Recurring invoices
    • Invoicing API (500/month)
  • Mercury Pro$299/month
    • All Plus features
    • Relationship manager
    • Free ACH invoice debits

Starling Bank

Free
  • Personal current accountFree
    • Free current account with FSCS-protected deposits
    • Fee-free foreign currency card spending
    • No monthly account fee
  • Business Toolkit$7/month
    • Integrated invoicing and expense categorisation
    • Multiple sub-accounts (Spaces) for tax and VAT setting-aside
    • Accounting software integrations

Which should you pick?

Choose Mercury if

  • You need business checking.
  • You want to start without paying.
  • You work on Web, Ios, Android.
  • You also want savings accounts.
Mercury review

Choose Starling Bank if

  • You need fscs-protected deposits.
  • You want to start without paying.
  • You work on iOS, Android, Web.
  • You also want business banking suite.
Starling Bank review

Questions people ask

Is Mercury or Starling Bank better?
Neither clearly leads. Mercury starts at Free and Starling Bank at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mercury or Starling Bank?
Mercury starts at Free and Starling Bank at Free.
Does Mercury or Starling Bank run on more platforms?
Mercury runs on Web, Ios, Android. Starling Bank runs on iOS, Android, Web.
Can I use Mercury for free?
Both have a free tier, so you can try either at no cost before committing.
What is Mercury best used for?
Mercury is most often used for business banking and payments for startups, managing treasury, invoicing and corporate cards from one account. Of those, business banking and payments for startups and managing treasury, invoicing and corporate cards from one account are not what Starling Bank is typically brought in for.
What can Mercury do that Starling Bank cannot?
Mercury covers Business checking, Savings accounts, Virtual cards, Team management. Starling Bank covers FSCS-protected deposits, Business banking suite, Fee-free foreign card spending, Savings Spaces.

Answered from the vendors’ own pages

Mercury: Is Mercury business banking free?

Mercury's base banking tier is free and includes ACH payments, domestic wire transfers, real-time payments, Bill Pay, and QuickBooks/Xero automations at no monthly cost.

Source
Starling Bank: Is Starling Bank a real bank?

Yes, Starling Bank Limited holds a full UK banking licence and is regulated by the FCA and PRA, the same framework as traditional UK banks.

Mercury: What does Mercury Plus add beyond the free tier?

Mercury Plus costs $29.90 per month and adds invoice ACH debits, recurring invoice capabilities, invoicing API with 500 calls per month, unlimited 1099 filings, and access to partner benefits.

Source
Starling Bank: Are deposits protected if Starling fails?

Eligible deposits are covered by the Financial Services Compensation Scheme up to 85,000 pounds per eligible person, the same statutory protection as other UK banks.

Mercury: Does Mercury charge monthly account fees?

No, Mercury states there are no minimum account balance requirements, overdraft fees, required monthly fees, or account opening fees. The free tier includes essential business banking, with paid tiers available for additional features.

Source
Starling Bank: Is Starling good for a small business?

It has a well regarded business banking product with integrated invoicing and accounting software links, commonly used by UK sole traders and small companies.

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