Sphere

AI-powered sales tax, VAT and GST compliance

4.9Score#76 of 999 agents#2 of 7 in Tax preparer

Why it ranks #76

Sphere, an AI tax preparer from YC W22, ranks #76 of 999 AI agents and #2 of 7 in Tax preparer, with a score of 4.9 of 10. Data as of 3 Oct 2026.

The score adds four parts, each 0 to 10, by weight. Every point comes from public evidence. How scoring works ·

Proof 3 × 30% 0.9
Scale 6 × 30% 1.8
Momentum 5 × 25% 1.3
Autonomy 6 × 15% 0.9
= 4.9

Proof
Do customers use it? 30% of the score
3
Claims named customers.
- +3
  Named customers
  “Our AI-powered tax engine helps tech companies like Runway AI, Sierra AI and Codieum remain in compliance when selling to customers around the world.”
  Launch YC post · 16 Aug 2024 · 2 claims
Not found: revenue or growth (+4), a customer result (+2), a customer count (+2), work done at scale (+2)
Scale
Is there a real company behind it? 30% of the score
6
7 people, raised $21M.
- +3
  7 people on its YC page5 to 9 people
- +3
  Raised $21M (Series A)a16z leads $21M Series A into AI-native tax compliance software Sphere | TechCrunchSource · 18 Nov 2025
Momentum
Is it shipping and growing now? 25% of the score
5
Shows hiring and funding news.
- +3
  Hiring: 7 open rolesSenior Product Engineer, Senior Full Stack Engineer, Senior Backend Engineer (Infrastructure)YC page
- +2
  Funding news in the last yeara16z leads $21M Series A into AI-native tax compliance software Sphere | TechCrunchSource · 18 Nov 2025
Not found: launch YC post in the last 6 months (+3), new traction claim in the last 6 months (+2), a batch in the last year (it is YC Winter 2022) (+1)
Autonomy
How much of the job does it do on its own? 15% of the score
6
Supervised agent: takes actions in other systems; a person approves key steps.
- +6
  Level 2 of 4: Supervised agentTakes actions in other systems; a person approves key steps.
What the model read
- Acts in other systems: 81% likely
- Finishes whole tasks: 41% likely
- Calls itself an agent: 3% likely
Level 2: Takes actions in other systems; a person approves key steps.

About Sphere

Sphere is an AI-powered cross-border compliance platform.

We help companies like Lovable, Eleven Labs, Replit and Windsurf automate their sales tax, VAT, GST compliance obligations.

What makes us different to other vendors on the market is:

1. we have spent the last 1.5 years building local rails into 100+ tax authorities in both the US and internationally to properly automate compliance processes, and 2. we've built the world's first AI-native tax engine which ingests, codifies and monitors tax law globally.