Fonoa vs Sphere
Fonoa
Global businesses with digital and cross-border business models, including marketplaces
Dublin, Ireland (registered office); founded by three Uber alumni; founding year not published
Sphere
Companies selling across borders, typically US$10m+ ARR with multiple entities; also billing and commerce platforms and accounting and tax advisory firms
Fonoa and Sphere both automate indirect tax for businesses that sell across borders, covering VAT, GST and sales tax.
Fonoa, registered in Dublin and backed by a US$110m Series C, serves global digital businesses and marketplaces such as Uber, Canva and Booking.com; Sphere, backed by Andreessen Horowitz, handles registration, filing and remittance across 130+ jurisdictions for companies such as ElevenLabs, Replit and Deel.
Fonoa vs Sphere: side by side
“Not published” means the vendor does not state it.
| Fonoa | Sphere | |
|---|---|---|
| What it does | Indirect tax platform: tax ID validation, VAT, GST and sales tax calculation, e-invoicing and returns, plus tax law monitoring and tax data audit tools; AI agents coming soon | AI-native cross-border indirect tax compliance: sales tax, VAT and GST monitoring, registration, calculation, filing and remittance across 130+ jurisdictions |
| Best for | Global businesses with digital and cross-border business models, including marketplaces | Companies selling across borders, typically US$10m+ ARR with multiple entities; also billing and commerce platforms and accounting and tax advisory firms |
| Founded and HQ | Dublin, Ireland (registered office); founded by three Uber alumni; founding year not published | Not published |
| Ownership and funding | Venture-backed; US$110m Series C (May 2026) led by Headline with Eurazeo and Forestay Capital, alongside Index Ventures, OMERS, Coatue and Dawn Capital; bought PwC's Indirect Tax Edge platform in the same deal | Private; Series A US$21m led by Andreessen Horowitz with Y Combinator and Felicis (Nov 2025); 20VC also listed as a backer |
| Customers or users | Canva, Uber, Netflix, Nebius and Booking.com; e-invoicing for 1M+ marketplace sellers | Named customers include ElevenLabs, Replit, Lovable, Deel, Ramp, Framer, Cognition, Runway and Fyxer |
| Pricing | Not published | Starter US$100 per region per month (under 10 regions, up to 50,000 transactions); Growth (10+ regions) custom; per-transaction fee above 50,000 |
| Deployment and markets | Tax determination in 190+ jurisdictions; tax ID validation in 100+ countries; e-invoicing across 150+ countries | Cloud platform; 130+ jurisdictions worldwide (US states, Canada, EU, UK, Australia, India and more), with direct connections to tax authorities |
Main differences
Fonoa covers tax ID validation, tax calculation, e-invoicing and returns, plus tax law monitoring and tax data audit tools; Sphere covers monitoring, registration, calculation, filing and remittance, with e-invoicing and input tax recovery add-ons.
Fonoa determines tax in 190+ jurisdictions and runs e-invoicing across 150+ countries; Sphere covers 130+ jurisdictions.
Fonoa serves global digital and cross-border businesses, including marketplaces with 1M+ sellers; Sphere serves cross-border companies, typically from US$10m ARR with multiple entities.
Sphere publishes a Starter plan at US$100 per region a month; Fonoa does not publish prices.
Fonoa raised a US$110m Series C in May 2026; Sphere raised a US$21m Series A in November 2025.
Which to choose
Choose Fonoa if
- You run a marketplace or large digital platform and need tax ID validation, e-invoicing and tax determination in 190+ jurisdictions
Choose Sphere if
- You are a growing software company that wants registrations, filings and remittance handled in many countries at a published price per region
Compare further
Common questions
What is the difference between Fonoa and Sphere?+
Fonoa is an indirect tax platform for tax ID validation, VAT, GST and sales tax calculation, e-invoicing and returns, with tax law monitoring and tax data audit tools. Sphere handles cross-border sales tax, VAT and GST monitoring, registration, calculation, filing and remittance, with input tax recovery and e-invoicing add-ons.
Which countries do Fonoa and Sphere cover?+
Fonoa determines tax in 190+ jurisdictions, validates tax IDs in 100+ countries and runs e-invoicing across 150+ countries. Sphere covers 130+ jurisdictions, including US states, Canada, the EU, the UK, Australia and India.
How are Fonoa and Sphere funded?+
Fonoa raised a US$110m Series C in May 2026, led by Headline with Eurazeo and Forestay Capital, and bought PwC's Indirect Tax Edge platform in the same deal. Sphere raised a US$21m Series A in November 2025, led by Andreessen Horowitz with Y Combinator and Felicis.
Part of Accountio’s accounting technology coverage.
