Run legacy and modern systems side by side

Modernize one business process at a time while your core systems keep serving the business. OpenLegacy connects legacy and modern applications in both directions, so you move each process when it's ready and roll back any step without a big-bang cutover.

Why all-or-nothing modernization stalls

Your core systems run the business every day, so you can't switch them off to rebuild them. Yet most modernization plans make modern apps wait until the old system is gone.

Modern channels wait for a rewrite

Big-bang plans hold back new apps until the rewrite ships. And COBOL and RPG programs can't call modern HTTP services, so integration only runs one way.

Business rules tied to green screens

Many host programs mix business rules with screen interaction. New services can't call those rules without driving the terminal screen.

Hidden dependencies between apps

During decoupling, traffic between applications moves without rules or approval, and teams can't reverse a change once it's live.

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Coexistence in both directions

OpenLegacy lets legacy and modern systems call each other as services. Modern apps reach existing host programs and data, host programs call modern services, and gateway routing moves each business process to its new home with an approval and a way back.

System APIs

Expose existing CICS programs and connector operations as REST, events, or other endpoints without a cutover.

Reverse APIs

Generate COBOL and RPG clients so host programs call modern HTTP services directly.

Screen to RPC

Convert screen-bound COBOL into callable programs that keep the same business rules.