Sphere vs Zamp
Sphere
Companies selling across borders, typically US$10m+ ARR with multiple entities; also billing and commerce platforms and accounting and tax advisory firms
Zamp
Growing small to mid-size digital businesses (e-commerce, SaaS, digital services), plus accounting firms serving clients on a referral or white-label basis
Founding year not published; Miami, Florida, US
Sphere and Zamp both handle indirect tax compliance for growing businesses, from monitoring where obligations build up to registration, filing and remittance.
Sphere, backed by Andreessen Horowitz, is AI-native software covering sales tax, VAT and GST across 130+ jurisdictions for companies selling across borders; Zamp, based in Miami, combines software with tax specialists in a managed sales tax service for the US and Canada.
Sphere vs Zamp: side by side
“Not published” means the vendor does not state it.
| Sphere | Zamp | |
|---|---|---|
| What it does | AI-native cross-border indirect tax compliance: sales tax, VAT and GST monitoring, registration, calculation, filing and remittance across 130+ jurisdictions | Managed sales tax compliance: software plus tax specialists handling nexus tracking, registrations, rooftop-level calculation, filing, remittance and notices |
| Best for | Companies selling across borders, typically US$10m+ ARR with multiple entities; also billing and commerce platforms and accounting and tax advisory firms | Growing small to mid-size digital businesses (e-commerce, SaaS, digital services), plus accounting firms serving clients on a referral or white-label basis |
| Founded and HQ | Not published | Founding year not published; Miami, Florida, US |
| Ownership and funding | Private; Series A US$21m led by Andreessen Horowitz with Y Combinator and Felicis (Nov 2025); 20VC also listed as a backer | Private; US$30m raised in total, latest round led by Acrew Capital with Thomson Reuters Ventures (announced Apr 2026) |
| Customers or users | Named customers include ElevenLabs, Replit, Lovable, Deel, Ramp, Framer, Cognition, Runway and Fyxer | 1,200+ finance and accounting teams and over 120 accounting firms; named customers include Crumbl, Oats Overnight, David Protein, Cult Gaia, Tushy, Handwrytten; firms include Withum and Anchin |
| Pricing | 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 | Free plan (nexus and exposure assessment, API sandbox); paid U.S. and U.S. + Canada plans scoped per customer, no list prices, no per-transaction fees |
| Deployment and markets | Cloud platform; 130+ jurisdictions worldwide (US states, Canada, EU, UK, Australia, India and more), with direct connections to tax authorities | Cloud platform with managed service; US (50+ states and territories, 13,000+ jurisdictions) and Canada (GST/HST/PST/QST) |
Main differences
Sphere files through direct connections to tax authorities, with tax experts approving each determination; Zamp is a managed service, done for you or done with you, with tax specialists handling filings and notices.
Sphere covers 130+ jurisdictions, including US states, Canada, the EU, the UK, Australia and India; Zamp covers the US, across 50+ states and territories, and Canada.
Sphere's Starter plan costs US$100 per region a month for under 10 regions, with custom pricing above that; Zamp has a free plan and scopes paid plans to each customer, with no per-transaction fees.
Sphere names ElevenLabs, Replit, Deel and Ramp; Zamp serves 1,200+ finance and accounting teams and over 120 accounting firms.
Which to choose
Choose Sphere if
- You sell software or digital services across borders and need VAT and GST as well as US sales tax
Choose Zamp if
- You sell mainly in the US and Canada and want tax specialists to handle registrations, filings and notices for you
Either way: If you are an accounting firm, both let you refer clients or offer the service under your own brand.
Compare further
Common questions
What is the difference between Sphere and Zamp?+
Sphere is AI-native indirect tax software for cross-border sellers, covering sales tax, VAT and GST monitoring, registration, calculation, filing and remittance across 130+ jurisdictions. Zamp is a managed sales tax service: software plus tax specialists handling nexus tracking, registrations, rooftop-level calculation, filing, remittance and notices.
How much do Sphere and Zamp cost?+
Sphere's Starter plan costs US$100 per region a month for under 10 regions and up to 50,000 transactions; its Growth plan, for 10+ regions, is custom. Zamp has a free plan for nexus and exposure assessment; its paid US and US-plus-Canada plans are scoped to each customer, with no per-transaction fees.
Which countries do Sphere and Zamp cover?+
Sphere covers 130+ jurisdictions worldwide, including US states, Canada, the EU, the UK, Australia and India, with direct connections to tax authorities. Zamp covers the US, across 50+ states and territories and 13,000+ jurisdictions, and Canadian GST, HST, PST and QST.
Part of Accountio’s accounting technology coverage.
