Kintsugi
8.8#1 in tax compliance software$75 one-timeFree planAndroidiOSWebAPI
VisitKintsugi vs OpenSalesTax
OpenSalesTax
7.4#3 in tax engine softwareFree planFree planWebAPILinuxmacOS
VisitWhat both publish
| Fact | Kintsugi | OpenSalesTax |
|---|---|---|
| API access | Yes | Authentication defaults to open access with per-IP rate limiting, while an API-key mode requires an X-API-Key header and supports per-key rate limits and usage tracking. |
Kintsugi plans
- Premium—
- FreeFree
- Starter$75, paid once
- Scale—
OpenSalesTax plans
- Free / open sourceFree
- Free self-hosted engineFree
Pick Kintsugi if…
Kintsugi suits businesses that need sales tax monitoring, registration, calculation, and return filing. It is also relevant to teams wanting CSV imports, no-code integrations, or broader multi-country compliance capabilities.
Pick OpenSalesTax if…
OpenSalesTax suits developers or organizations building US transaction tax calculations who can self-host an API. Users should be prepared to verify calculations with the relevant state Department of Revenue before remitting.