Sphere vs Numeral
Side-by-side comparison of AI visibility scores, market position, and capabilities
SF YC W22 AI global tax compliance at 30%+ MoM growth since Dec 2024 launch; $25.3M total ($21M a16z Series A Nov 2025) with Stripe native integration serving Deel/Replit/Eleven Labs/Lovable competing with Avalara for automated multi-jurisdiction...
About
Sphere is a San Francisco-based AI-powered global tax compliance platform — backed by Y Combinator (W22) with $25.3 million in total funding including a $21 million Series A in November 2025 led by Andreessen Horowitz with Felicis and Y Combinator, following a $4.3 million seed — providing technology companies and global businesses with automated sales tax, VAT, and GST monitoring, registration, calculation, filing, and remittance across 100+ global tax jurisdictions through direct integrations with tax authorities and a proprietary AI Tax Rules and Analysis Model (TRAM) that continuously codifies global tax rules as they change. Launching from stealth in December 2024, Sphere has achieved 30%+ average monthly revenue growth and serves customers including Deel, Replit, Eleven Labs, Lovable, Windsurf, and HeyGen as one of only three tax vendors with native Stripe integration.
E-commerce sales tax automation with fully managed multi-state filing and remittance; post-Wayfair compliance service for Shopify merchants handling nexus monitoring to payment.
About
Numeral is a sales tax compliance automation platform helping e-commerce businesses automate the filing and remittance of sales tax across US states, eliminating the manual burden of multi-state sales tax compliance that became significantly more complex after the 2018 South Dakota v. Wayfair Supreme Court decision requiring online sellers to collect sales tax in states where they have economic nexus. Founded in 2021 and headquartered in San Francisco, Numeral raised $4 million to build a simpler, more automated sales tax solution for Shopify and e-commerce merchants.
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