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Best Accounting APIs in 2026

Accounting APIs connect software with accounting systems so applications can exchange financial records and automate bookkeeping tasks. This list is for people comparing integration options on a budget.

  1. 1

    e-Boekhouden API

    Free plan AndroidAPIiPhone+1
    7.5 From €9.95/mo · 14-day trial Visit site
  2. 2

    Conductor QuickBooks Desktop API

    Free plan APIWebWindows
    7.4 From $49/mo Visit site
  3. 3

    FreeAgent

    by FreeAgent
    Free plan AndroidAPIiPhone+1

    FreeAgent brings accounting, invoicing, expenses, and tax tasks together, with mobile apps and UK bank feeds.

    7.4 Free plan · paid from £10/mo · 30-day trial Visit site
  4. 4

    Billy API

    Free plan APIWeb
    7.3 Free plan · paid from 160 DKK/mo · 30-day trial Visit site
  5. 5

    Knit

    by Knit
    Free plan AndroidAPIiPhone+1

    Knit brings together API-based integrations, workflow creation, and managed-auth MCP access.

    7.3 Free plan · paid from $29/mo · 30-day trial Visit site
  6. 6

    Akaunting

    by Akaunting
    Free plan Web

    Choose Akaunting if you need web-based accounting features such as invoicing, receipt capture, inventory tracking, bank feeds, and accountant access.

    7.2 Free plan · paid from $8/mo (annual) Visit site
  7. 7

    Moneybird API

    Free plan AndroidAPIiPhone+1
    7.2 From €3/mo · 60-day trial Visit site
  8. 8

    Merge

    Free plan APIWeb
    7.0 Free plan · paid from $650/mo Visit site
  9. 9

    QuickBooks Online Accounting API

    Free plan APIWeb
    6.8 Free plan Visit site
  10. 10

    Rutter

    Free plan APIWeb
    6.8 Pricing on request · 30-day trial Visit site
  11. 11

    AccountRight API

    Free trial AndroidAPIiPhone+3
    6.6 From 110/mo Visit site
  12. 12

    Zoho Books

    by Zoho Books
    Free plan AndroidiPhone

    Zoho Books covers core accounting alongside inventory, mobile apps, and accountant access. The free plan has revenue and usage limits, while Standard is listed at $15 a month with annual billing.

    6.6 Free plan · paid from $15/mo (annual) · 14-day trial Visit site
  13. 13

    Xero Accounting API

    Free plan API

    Xero’s API provides core accounting endpoints, integration controls, and several developer resources.

    6.5 Free plan · paid from 35 AUD/mo Visit site
  14. 14

    FreshBooks

    by FreshBooks
    Free trial AndroidAPIExtension+4

    Choose FreshBooks if you need invoicing linked to tracked time, expenses, and client projects, with mobile apps and online payment options.

    6.3 From $23/mo · 30-day trial Visit site
  15. 15

    Holded API

    by Holded API
    Free trial AndroidAPIiPhone+1

    Choose Holded API if your business needs programmatic access to Holded data and the areas covered by its API reference.

    6.3 From €15/mo · 14-day trial Visit site
  16. 16

    Apideck

    Free trial APIWeb
    6.2 From $599/mo · 30-day trial Visit site
  17. 17

    KashFlow

    by KashFlow
    Free trial AndroidAPIiPhone+1

    KashFlow brings bookkeeping, invoicing, bank feeds, VAT support, and payroll together for small businesses. It has a trial but no free plan, and Starter has invoice and transaction limits.

    6.2 From £13.50/mo · 14-day trial Visit site
  18. 18

    MYOB Business

    Free trial AndroidAPIiPhone+2

    MYOB Business combines core accounting with inventory, workflow, time, document, and staff-management features.

    6.1 From 315 AUD/yr · 14-day trial Visit site
  19. 19

    Exact Online

    by Exact Online
    Free trial Web

    Exact Online combines accounting and CRM with features for several business sectors. It has a free trial but no free plan, and package prices exclude VAT.

    5.9 From £25/mo · 30-day trial Visit site
  20. 20

    Fortnox

    by Fortnox
    Paid AndroidAPIiPhone+1

    Fortnox combines mobile bookkeeping with feeds, reconciliation, invoicing, receipts, inventory, and accountant access.

    5.9 Visit site
  21. 21

    Qoyod

    Free trial AndroidiPhoneWeb
    5.9 14-day trial Visit site
  22. 22

    Truto Accounting API

    Free trial APISelf-hostedWeb
    5.8 From $999/yr · 30-day trial Visit site
  23. 23

    Codat

    Paid APIWeb

    Choose Codat if a commercial bank needs portfolio insights alongside standardized connections to accounting, banking, and commerce platforms.

    5.7 Pricing on request Visit site
  24. 24

    Unified.to Accounting API

    Free trial APIWeb
    5.6 From $750/mo · 30-day trial Visit site
  25. 25

    Sage Intacct API

    by Sage Intacct API
    Paid APIWeb

    Sage Intacct API combines broad accounting integration coverage with two-way synchronization, SDK support, and a sandbox.

    5.2 Pricing on request Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

Compare free-plan limits, trial terms, paid starting prices, supported platforms, and connection features. Look at invoice synchronisation, journal entries, how records travel, webhooks, sandbox availability, and authentication. If code access matters, read the open-source licence and confirm what it permits.

Questions

Are free plans available for accounting APIs?

Some items in this category provide a free plan. Check the individual plan for included features, connection limits, and usage terms.

Can I try an accounting API before paying?

Trial availability varies. Billy API and Apideck list 30-day trials, while e-Boekhouden API lists a 14-day trial.

What should I compare besides price?

Look at included connections, invoice sync, journal entries, sync direction, webhooks, sandbox access, and API authentication.

Which platforms do these tools support?

The listed platforms are web, API, Android, iOS, Windows, and macOS. Confirm support for your target platform.

Why does sync direction matter?

It shows whether data can move into the accounting system, out of it, or in both directions. Match it to the workflow your application needs.

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