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API Terms/Productivity
Category

Productivity APIs

12 Productivity APIs with verified auth, pricing and rate limits. 6 offer a free tier; 1 document an MCP server. Every field carries the source URL that states it.

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APICategoryAuthPricingFree tierLimitsOpenAPIMCPChecked
caldayscaldays.comProductivityno authfreemium✓✓n/d✓2026-07-08
Holiday APIholidayapi.comProductivityAPI keyfreemium✓✓n/dn/d2026-07-12
The Calendarthe-calendar.netProductivityno authfree✓✓n/dn/d2026-07-12
Calendarificcalendarific.comProductivityAPI keyfreemium✓✓n/dn/d2026-07-12
Festivo Public Holidaysgetfestivo.comProductivityAPI keyfreemium✓✓n/dn/d2026-07-12
UK Bank Holidays APIgov.ukProductivityn/dfree✓✓n/dn/d2026-07-26
Checkiday - National Holidayapilayer.comProductivityAPI keyfreemiumn/dn/dn/dn/d2026-07-08
Hebcalhebcal.comProductivityn/dfreen/dn/dn/dn/d2026-07-12
LectServelectserve.comProductivityno authn/dn/dn/dn/dn/d2026-07-26
Qualtrics APIqualtrics.comProductivityn/dcontact salesn/dn/dn/dn/d2026-07-26
isDayOff()isdayoff.ruProductivityn/dn/dn/dn/dn/dn/d2026-07-12
Nager.Datenager.atProductivityn/dn/dn/dn/dn/dn/d2026-07-12