NRules/NRules

Health v2 · maintenance only

Adoption not part of the score

1649 stars · 282 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

NRules is an open-source production rules engine for .NET based on the Rete matching algorithm, with rules authored in C# via an internal fluent DSL. It acts as an inference engine supporting forward chaining, fact queries, and quantifiers, with packages for rule serialization, testing, and DI container integration.

Use cases

• encode business rules separately from application logic in .NET
• build an inference engine with forward chaining in C#
• implement an insurance quote calculator driven by declarative rules
• author rules in C# using a fluent DSL instead of external rule scripts
• unit test rule definitions and expectations
• serialize rules to and from JSON

When to choose

• you need a production rules system on the .NET platform
• you want rules written in C# rather than an external DSL
• you need efficient Rete-based pattern matching over facts
• you want rules decoupled from application code in separate assemblies

When to avoid

• you need a rules engine outside the .NET ecosystem
• you need simple if/else logic that doesn't justify a rules engine
• you require externalized rules authored by non-developers in a business language

Facets

library · maturity active

interpreter workflow-automation developer-tools developer-tools backend dotnet cross-platform rules-engine rete-algorithm inference-engine forward-chaining internal-dsl business-rules c-sharp automation

Member repositories

For agents

markdown · JSON · MCP: product_card(name="NRules/NRules")