Kintsugi vs Zamp

The verdict at a glance

Kintsugi scores higher overall (74 to 69), but the right pick depends on what you weight.

Kintsugi is AI-native sales tax software that monitors nexus for free, then registers, files and remits US sales tax for small and mid-sized e-commerce and SaaS sellers from $75 per filing, with VAT, ERP calculation and API access on custom-priced Premium.

Zamp is a managed sales tax service for US e-commerce and SaaS sellers and for accounting firms: its software calculates tax and tracks nexus while Zamp's own tax team registers, files, remits and answers state notices in the US and Canada for a quoted annual fee.

Quick facts

• Kintsugi AF score. 74/100
• Kintsugi implementation. Low
• Kintsugi best fit. SMB e-commerce and SaaS sellers
• Zamp AF score. 69/100
• Zamp implementation. Low
• Zamp best fit. Lean teams filing in 10+ states

Dimension by dimension

• Compliance depth. Kintsugi 66, Zamp 61. Edge: Kintsugi.
• Scalability. Kintsugi 69, Zamp 63. Edge: Kintsugi.
• AI / agent readiness. Kintsugi 84, Zamp 57. Edge: Kintsugi.
• Support. Kintsugi 78, Zamp 82. Edge: Zamp.
• Implementation. Kintsugi 80, Zamp 80. Edge: Even.
• Pricing transparency. Kintsugi 74, Zamp 54. Edge: Kintsugi.
• Tax content & coverage. Kintsugi 71, Zamp 67. Edge: Kintsugi.
• Integrations & data flow. Kintsugi 81, Zamp 70. Edge: Kintsugi.

Pick Kintsugi if

• A Shopify, Amazon or Stripe seller that just crossed nexus in a handful of states and wants filing handled without an annual contract.
• A SaaS company billing through Stripe, Chargebee or Zuora that needs nexus tracked and US returns filed, and can wait on global coverage.
• An accounting firm or fractional CFO running sales tax for a client book through Kintsugi Portfolio.

Pick Zamp if

• An e-commerce or SaaS finance team of one to three people filing in 10 to 45 states that wants registrations, returns and notices handled by someone else
• An accounting or CAS firm that wants to offer sales tax to clients through a referral or white-label model without hiring a state and local tax team
• A Shopify, NetSuite, QuickBooks Online or Xero seller leaving Avalara, TaxJar or Shopify Tax filing that values a named account manager and a phone line

Further reading

• Use tax added alongside sales tax (Kintsugi, Sep 2026)
• Hosted MCP connector for Claude and ChatGPT (Kintsugi, Sep 2026)
• Kin AI assistant launched in the app (Kintsugi, Apr 2026)
• Three free months for Shopify merchants moving their filing (Zamp, Oct 2026)
• Exemption Certificate Management launches inside the platform (Zamp, Aug 2026)
• Public developer platform and free API trial (Zamp, Jul 2026)

Keep exploring

• The full Kintsugi review: scores, pricing, and where it fits.
• The full Zamp review: scores, pricing, and where it fits.
• Numeral vs Zamp

Both reviews are updated on a rolling cycle by our research agents.