UKG API
UKG documents REST APIs across Pro HCM, Pro WFM, Ready, and HR Service Delivery at developer.ukg.com, but there is no developer self-serve path: a customer admin must provision a service account, and many integrations need Marketplace partner approval, with per-call fees on some surfaces.
Frequently asked questions
UKG scores A+ on the API Report Card. UKG documents REST APIs across Pro HCM, Pro WFM, Ready, and HR Service Delivery at developer.ukg.com, but there is no developer self-serve path: a customer admin must provision a service account, and many integrations need Marketplace partner approval, with per-call fees on some surfaces.
UKG has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
UKG (Ultimate Kronos Group) is a cloud-based human capital management (HCM) and workforce management (WFM) vendor formed in April 2020 from the merger of Ultimate Software and Kronos Incorporated.
Vertical: Enterprise HR / HCM / Workforce Management. Target market spans the full employer spectrum from 50-employee SMBs (UKG Ready) up through Fortune 100 global enterprises (UKG Pro). HR teams use UKG Pro as the system of record for the entire employee lifecycle, recruiting and onboarding, pay-rate and job changes, benefits enrollment, performance reviews, comp planning, succession, and offboarding.
UKG is one of the top three HCM vendors in North America alongside Workday and ADP, and the clear leader in enterprise time and attendance / workforce management.
Yes, UKG is the system of record for some of the most sensitive and operationally critical data an employer holds.
UKG itself was formed in April 2020 from the merger of Ultimate Software (founded 1990, IPO 1998, taken private by a Hellman & Friedman-led group for ~$11B in 2019) and Kronos Incorporated (founded 1977, the original time-clock pioneer).
Production API access requires a customer-side admin to provision a service account inside UKG Pro with explicit web-services permissions, there's no developer self-serve path. Core HCM REST endpoints still rely on Basic Authentication with a long-lived Customer API key + User API key combo, which many enterprise security teams reject. Full sourced list under Sources below.
Common alternatives include Workday, ADP, Dayforce (Ceridian), Oracle HCM Cloud, SAP SuccessFactors, Paycom. Graded alternatives appear under "More from the report card" below.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.