Sphere

About Sphere

Sphere's headline rate is $100 per region per month, which lands on exactly the same number as Anrok's software-seller Starter plan — so the comparison has to be made on what a region buys rather than on price. Here it includes monitoring, registration, calculation and filing, plus back tax calculations for exposure you have already accrued, which is the expensive part of getting compliant late and is often a separate engagement elsewhere. A region is any jurisdiction where you must register and file: typically a US state, or a country outside it. Starter covers fewer than ten regions; past ten you move to Growth, priced on request, which adds a named account manager, on-demand access to the tax team and 24/7 Slack support. Two costs sit outside the subscription: per-transaction fees above 50,000 monthly transactions, and any registration fees the jurisdictions themselves levy. The technical claim is TRAM, an in-house model built by tax specialists that codifies jurisdiction rules into determinations, sitting on what the company calls local rails into 100+ tax authorities — direct filing connections rather than partner handoffs. The company is young and well-capitalised, with an unusual origin: founder and CEO Nicholas Rudder raised a $4.3M seed for ScholarSite, an ed-tech marketplace, and pivoted into tax after hitting cross-border compliance himself, reaching a $21M Series A led by a16z in November 2025 with Felicis, Y Combinator and 20VC behind it. Its customer list skews to fast-scaling AI and developer companies — ElevenLabs, Lovable, Replit, Runway, Deel — which is a fair proxy for who this suits.

Pricing

Model

Paid

Starting price

$100/region/mo

Notes

Starter is $100 per region per month for fewer than 10 regions and includes monitoring, registration, calculation, filing and back tax calculations. A region is any jurisdiction requiring registration and filing — typically a US state or a country elsewhere. Growth (10+ regions) is custom-priced and adds a dedicated account manager, on-demand tax team support and 24/7 Slack support. Two charges fall outside the subscription: per-transaction fees for clients exceeding 50,000 transactions per month, and registration fees imposed by some jurisdictions. No free tier. The per-region rate matches Anrok's $100 per market per month software plan, so compare on inclusions rather than headline price.

Key Features

• Per-region subscription that bundles monitoring, registration, calculation and filing in one rate
• Back tax calculations included at the Starter tier for historical exposure
• TRAM, an in-house AI tax review and assessment model trained on jurisdiction tax code
• Direct local rails into 100+ tax authorities for end-to-end registration, filing and remittance
• Global scope across US sales tax, VAT and GST, with new jurisdictions added on a rolling basis
• Growth tier support model: dedicated account manager, on-demand tax team and 24/7 Slack

Platforms

• Web
• API

Alternatives to Sphere

• Anrok
• Numeral
• Zamp
• Quaderno
• Stripe Tax