Adsum vs Fonoa
Adsum
Fintech innovator providing OpenTax for Accountants & Bookkeepers and InstantVAT refunds for businesses
26 employees · est. 2019 · London, United Kingdom
Fonoa
Indirect Tax Operating System for Global Businesses
284 employees · est. 2019 · Dublin, Croatia (hrvatska)
Fonoa is the larger of the two.
13 signals in the last 90 days
Side-by-Side Comparison
| Metric | Adsum | Fonoa |
|---|---|---|
| Founded | ||
| Founded | 2019 | 2019 |
| Headquarters | ||
| Headquarters | London, United Kingdom | Dublin, Croatia (hrvatska) |
| Employees | ||
| Employees | 26 | 284 larger |
| Industry | ||
| Industry | Financial Services, Fintech | API, Financial Services, Fintech |
| Funding Stage | ||
| Funding Stage | Seed | Series C |
| Total Funding | ||
| Total Funding | $15.00M | $195.00M |
| Funding Rounds | ||
| Funding Rounds | 2 | 4 |
| Services | ||
| Services | Tax Management Automation, HMRC Data Synchronization, Deadline Tracking and Alerts, Automated Client Notifications, Real-time Data Dashboards, Client and Team Collaboration Tools, Tax Connection Management | Global Tax ID Validation, Automated Indirect Tax Calculation, Compliant E-Invoicing Management, Indirect Tax Return Preparation, Real-Time Tax Reporting, Tax Intelligence and Knowledge, AI-Driven Tax Workflow Automation |
| Target Customers | ||
| Target Customers | Accounting Practices, Tax Advisors, Bookkeeping Professionals, Accountants | Digital Economy Businesses, Tax Directors, Global Enterprises, Compliance Teams |
| Taxonomy | ||
| Taxonomy | Tax InfrastructureInstant VAT RefundsOpenTaxAccountancy SolutionsReal-time Tax InsightsProperty VAT +8 | Indirect TaxTax AutomationTax TechnologyE-invoicingReal-time Tax DeterminationTax ID Validation +9 |
| Website | ||
| Website | adsum-works.com | fonoa.com |
About Adsum
Adsum, founded in 2019, is a burgeoning player in the Fintech and Financial Services industries, headquartered in the United Kingdom. The company distinguishes itself with a focus on tax infrastructure innovation through its flagship offerings: InstantVAT Technology, OpenTax, and PropertyVAT powered...
About Fonoa
Fonoa is a company headquartered in Dublin, Croatia, specializing in providing a tax operating system for global businesses. It focuses on serving digital economy businesses, tax directors, global enterprises, and compliance teams. Founded in 2019, Fonoa offers services that include global tax ID...
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Compiled from the BounceWatch company index. We last looked at Adsum on 3 Jul 2025, and Fonoa on 6 Oct 2026. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.
