IBM Host Access Transformation Services is a host-access modernization tool that converts IBM z/OS 3270 and IBM i 5250 terminal applications into web- and mobile-friendly browser interfaces, exposes host transactions as SOAP or REST services, and enables embedding into portals or rich clients while minimizing changes to host source code.
Published Oct 13, 2026
Detailed public market-share data for HATS is limited. The product remains part of IBM's toolkit for IBM Z and IBM i modernization efforts.
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Because HATS combines host transformation and service-enablement, direct comparisons may be uneven. The table below provides a pragmatic comparison of typical alternatives:
| Aspect | IBM HATS | Rocket Terminal Emulator (Web Edition) | Rebuild / API-first modernization (custom) |
|---|---|---|---|
| Starting Price | Not publicly listed (quote-based via the vendor) | Subscription-based; published per-user/feature pricing available from the vendor | Highly variable (engineering and platform costs) |
| Typical Use Case | Modernizing terminal apps into web UI and service exposure without changing host code | Secure browser-based terminal access when transformation is not required | Deep UX redesign, long-term flexibility, and API governance |
| Key Strength | Allows reuse of existing host logic and enables web interfaces and service endpoints without modifying host code | Simpler access layer with fewer moving parts than a transformation toolchain | Maximum control and flexibility; avoids screen-driven fragility |
| Key Weakness | Transformation and macro approaches can be complex and fragile; dependent on runtime stack and recognition rules | Not designed for UI transformation beyond emulator experience | Highest cost and time-to-market; significant engineering effort |