18.2
FreeAgent is accounting software for handling business administration, including invoicing, expenses, tax reporting, and business reports.
Free planAndroidiOSWeb
Best Accounting APIs in 2026
Accounting APIs connect software with accounting records and help move invoices or journal entries between services. Compare included connections, invoice sync, journal-entry support, sync direction and webhook options. Android is one platform represented in this category. Check whether the service has an Android app or works through its web interface, then compare iOS, Windows, macOS and API access for your…
28.0
FreshBooks is accounting software for freelancers, solopreneurs, and small businesses.
AndroidiOSWeb
37.9
AndroidiOSWeb
- 4
Zoho Books
Zoho Books is an accounting service for managing invoices, bills, banking, inventory, expenses, projects, reporting, and online payments.
Free planAndroidiOS7.9From $15 a month - 5
KashFlow
KashFlow is cloud accounting software for small businesses, with tools for bookkeeping, invoicing and payroll.
AndroidiOSWebAPI7.7From £97 a year - 6
Knit
Knit provides integration tools for software teams and workflow builders: a Unified API, a natural-language Integrations Agent, and MCP servers.
Free planAndroidiOSWebAPI7.6From $29 a month - 7
Fortnox
Fortnox is a paid bookkeeping program from Fortnox, a maker founded in 2001 and headquartered in Växjö, Sweden.
AndroidiOSWebAPI7.3 - 8
Billy API
Free planWebAPI7.1From 160 DKK a month - 9
Exact Online
Web7.1 - 10
Holded API
Holded API lets businesses manage invoices, contacts, products, and other business data through software.
AndroidiOSWebAPI7.1From $15 a month - 11
AccountRight API
AndroidiOSWebAPI6.9From A$66 a month - 12
e-Boekhouden API
AndroidiOSWebAPI6.8From €4.98 a month - 13
Moneybird API
AndroidiOSWebAPI6.8From €3 a month - 14
Qoyod
AndroidiOSWeb6.8 - 15
Truto Accounting API
WebAPISelf-hosted6.4From $999 a year - 16
6.4From $750 a month - 17
Apideck
WebAPI6.3From $599 a month - 18
Conductor QuickBooks Desktop API
WebAPIWindows6.3From $49 a month - 19
Rutter
Free planWebAPI6.2Free plan - 20
Akaunting
Web6.1From $72 a year - 21
Merge
WebAPI6.1From $650 a month - 226.0From $300 a month
- 23
Twinfield API
WebAPI5.8From €58 a month - 24
Xero Accounting API
Xero Accounting API is a developer API for connecting a Xero organisation or partner practice with other products and programs.
API5.7From A$35 a month - 25
Sage Intacct API
WebAPI5.6
Choosing well
Check how you will access it
Confirm whether the service offers an Android app, web access or an API that fits your setup. Compare iOS, Windows and macOS support when your work spans devices.
A web interface can be useful when there is no Android app, while direct API access suits software integrations.
Compare free access and paid entry
A free plan or trial can let you assess an integration before paying. Check the stated paid starting price and whether pricing is listed or available on request.
Billy API lists a free plan with paid access from 160 DKK a month, while e-Boekhouden API lists a 14-day trial and plans from €9.95 per month.
Match the accounting workflow
Review included connections, invoice sync, journal entries and sync direction. These details show whether data can move into your accounting system, out to another service or in both directions.
Webhooks can notify connected software about changes, which may matter for timely updates.
Check testing and authentication
Look for a sandbox environment before connecting live accounting data. Compare the API authentication method with what your software can support.
If you need to read or change the code, check the tool's licence and documentation before adopting it.
Questions people ask
Do these accounting APIs have Android apps?
Android is a platform represented in this category, but app support varies. Check the product's platform details and use its web interface or API when an Android app is not offered.
Can I try an accounting API for free?
Free plans and free trials are offered by items in this category. Check the plan terms, trial length and paid starting price before connecting your accounts.
What should I compare for invoice syncing?
Compare invoice sync, journal-entry support, included connections and sync direction. Webhooks can also matter when software needs change notifications.
Why use a sandbox environment?
A sandbox lets you test an integration separately from live accounting records. Check whether the API provides one before building or connecting software.
Which platforms should I check?
Compare Android, iOS, web, Windows, macOS and API access against the devices and software used in your workflow.