What is GoRules?

GoRules is a commercial business rules engine. Teams use a visual editor to build decision graphs: decision tables, expressions, switches, and custom functions connected in a flow. Rules are stored as JSON Decision Models (JDM) and executed by the Zen engine, with SDKs for languages such as Node.js, Python, and Go.

The platform can run as GoRules Cloud or on your own infrastructure. Typical capabilities include versioned rule assets, a simulator for testing against sample data, HTTP APIs, and role-based access for authors and operators. Pricing is subscription-based (free tier through enterprise). Use cases span pricing, eligibility, underwriting, fraud checks, and similar operational decisions where product teams want logic outside application code.

GoRules vs Lemma

Lemma is an open-source declarative language (Apache 2.0). Rules live in textual specifications that read like structured policy, with built-in temporal versioning and explainable evaluation. One file is the authoritative artifact for engineers, compliance, and the runtime.

GoRules centres on a licensed platform and graph-shaped JDM assets edited in a visual studio. Lemma centres on a language you can own, diff in git, and embed without a rules-vendor subscription. Many teams compare them when choosing between a BRMS product and an open rules language for governed, long-lived decision logic.

A complete, more comprehensive comparison is coming soon. In the meantime, if you are weighing GoRules against Lemma for a specific programme, schedule a call with our founder Ben Rogmans to discuss when Lemma is the superior solution.