Sphere vs Atomic
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.
Venture studio co-founding 50+ companies including Hims & Hers; Jack Abraham's startup foundry providing capital, infrastructure, and operational support for new company creation.
About
Atomic (Atomic.vc) is a venture studio and startup foundry that co-founds companies alongside entrepreneurs, providing capital, infrastructure, talent networks, and operational support from ideation through early growth. Founded in 2012 by Jack Abraham (former VP Product at eBay after the acquisition of his startup Milo) and headquartered in San Francisco, Atomic has co-founded over 50 companies including Hims & Hers (NYSE: HIMS), OpenStore, Homebound, Fair, and numerous others, with a portfolio value that has reached into the billions.
AI Visibility Head-to-Head
Key Details
Capabilities & Ecosystem
Capabilities
Integrations
Also Compare
Track AI Visibility in Real Time
Monitor how your brand performs across ChatGPT, Gemini, Perplexity, Claude, and Grok daily.