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Finance & Accounting

Best Accounting APIs in 2026

Accounting APIs connect applications with accounting systems and data. Use this list when you are choosing an integration for software, finance workflows or business records.

  1. 01 FreeAgent

    It suits small businesses, accountants and bookkeepers handling invoicing, expenses, tax reporting and payroll.

    From £4.17/mo Free plan Web · iOS · Android · API
    9.1 Visit Specs
  2. 02 Billy API
    From 160 DKK/mo Free plan Web · API
    9.0 Visit Specs
  3. 03 FreshBooks

    FreshBooks suits freelancers, solopreneurs, and small businesses that need invoicing, time tracking, and project organization.

    From $4.60/mo Free trial Web · Windows · macOS · iOS
    9.0 Visit Specs
  4. 04 KashFlow

    Starter is positioned for sole traders, contractors and small businesses; Business is aimed at growing businesses and limited companies.

    Free trial Web · iOS · Android · API
    8.8 Visit Specs
  5. 05 MYOB Business
    From A$15/mo Free trial Web · Windows · iOS · Android
    8.8 Visit Specs
  6. 06 Exact Online

    Exact Online may suit businesses seeking cloud accounting and CRM, or manufacturing, wholesale, and professional-services tools.

    Free trial Web
    8.7 Visit Specs
  7. 07 AccountRight API
    From A$66/mo Free trial Web · Windows · macOS · iOS
    8.6 Visit Specs
  8. 08 Fortnox
    Web · iOS · Android · API
    8.6 Visit Specs
  9. 09 e-Boekhouden API
    From €4.98/mo Free trial Web · iOS · Android · API
    8.4 Visit Specs
  10. 10 Knit

    The Unified API is aimed at B2B SaaS teams, while the Integrations Agent is intended for non-technical teams.

    From $29/mo Free plan Web · iOS · Android · API
    8.4 Visit Specs
  11. 11 Holded API

    It suits businesses connecting software to Holded records across invoicing, accounting, sales, inventory, or CRM.

    From $15/mo Free trial Web · iOS · Android · API
    8.3 Visit Specs
  12. 12 Zoho Books

    Zoho Books suits solopreneurs and micro businesses within the free plan's revenue limit, as well as teams needing accounting, inventory, or accountant access.

    From $15/mo Free plan iOS · Android
    8.3 Visit Specs
  13. 13 Apideck
    From $599/mo Free trial Web · API
    8.2 Visit Specs
  14. 14 Conductor QuickBooks Desktop API
    From $49/mo Free trial Web · Windows · API
    8.2 Visit Specs
  15. 15 Qoyod
    Free trial Web · iOS · Android
    8.1 Visit Specs
  16. 16 Moneybird API
    From €3/mo Free trial Web · iOS · Android · API
    7.9 Visit Specs
  17. 17 Truto Accounting API
    From $83.25/mo Free trial Web · API · Self-hosted
    7.8 Visit Specs
  18. 18 Akaunting

    It suits businesses needing browser-based invoicing, receipt capture, inventory tracking, bank feeds, and accountant access.

    From $6/mo Web
    7.5 Visit Specs
  19. 19 Codat
    Web · API
    7.5 Visit Specs
  20. 20 Merge
    From $650/mo Web · API
    7.4 Visit Specs
  21. 21 Unified.to Accounting API
    From $750/mo Free trial Web · API
    7.4 Visit Specs
  22. 22 QuickBooks Online Accounting API
    From $300/mo Web · API
    7.3 Visit Specs
  23. 23 Rutter
    Free plan Web · API
    7.3 Visit Specs
  24. 24 Twinfield API
    From €58/mo Web · API
    7.1 Visit Specs
  25. 25 Sage Intacct API
    Web · API
    7.0 Visit Specs
How this list is ordered. Specifiction scores each tool on how fully its maker documents it, whether its prices are published, where the research puts it, the platforms it runs on and whether it can be tried for free (how we rank). Makers can also buy a numbered place (how Specifiction is paid for).

Compare the free plan, paid starting price, included connections, invoice and journal-entry sync, sync direction, webhooks, sandbox access, API authentication and supported platforms.

Compare FreeAgent and Billy API Get a place on this list

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