Sphere is an AI-powered global tax compliance platform that helps companies automate their sales tax, VAT, and GST compliance obligations around the world. It features a proprietary AI-native tax engine that codifies and monitors global tax law.

Sphere's AI-native tax engine continuously codifies and monitors global tax law, giving finance teams scalable compliance without manual research. The platform provides local rails into 100+ tax authorities worldwide, enabling true end-to-end automation across registration, calculation, filing, and remittance. Sphere raised $21 million in Series A funding led by Andreessen Horowitz.
Global tax compliance software
Funding
Worldwide tax compliance software
Quaderno provides tools to automate tax compliance and sell anywhere online, including e-invoicing with one single API. It helps businesses automate sales tax, VAT, and GST compliance.
Cancellation flows, conversion incentives, and revenue recovery
ProsperStack is customer lifecycle optimization for subscription businesses focused on reducing churn. The platform provides embeddable cancellation flows, conversion incentives, customer winbacks, and automated payment recovery.
Subscription metrics, retention, and pricing optimization
Founded
ProfitWell is a subscription revenue automation company founded in 2012 that was acquired by Paddle for $200+ million. It provides subscription metrics and retention software, serving over 30,000 businesses in more than 100 countries.