NRules
NRules: A free, self-hosted C# rules engine for developers embedding decision logic in .NET apps. Ranked #17 of 18 in Decision Management Software by our editors (6.7/10); pricing: Free plan; best for .NET developers embedding rules in applications.
At a glance
- Editor score6.7 / 10
- PricingFree plan
- Best for.NET developers embedding rules in applications
- Free planYes
- Paid fromFree
- Decision modelingRules
- Facts checked24 Sep 2026
Where it wins
- Define rules in C# with a fluent domain-specific language
- Rete-based inference evaluates rules
- Integrates rule execution into .NET applications
Where it doesn't
- Requires developers to author rules in C#
- Deployment is self-hosted
- Focused on rule-based decision logic
Our verdict on NRules
NRules is an open-source rules engine for software developers who want to embed rule-based decision logic in .NET applications. Rules are defined in C# through a fluent domain-specific language, then evaluated by a Rete-based inference engine. Its free, self-hosted model suits teams that prefer application-level control over decision logic rather than a separate hosted service or a business-user authoring interface.
The product’s center of gravity is clear: define rules in code and integrate their execution into a .NET application. That makes it relevant when decision logic belongs alongside application code and developers are the intended authors. Its platforms include Windows, Linux, and macOS, while deployment is self-hosted. The supplied positioning describes a narrow feature and integration set, so teams looking for broad decision-management workflows or a larger integration ecosystem should compare alternatives before choosing it.
NRules is listed as open source with a free plan, and no paid tiers are described here. That keeps the stated pricing model simple, but it also means buyers should not evaluate it as a commercial hosted service with tiered offerings. Choose NRules if a developer-led, C# rules engine that can run within a .NET application matches the requirement. Look elsewhere if business users need to author decisions, or if a hosted deployment is central to the project.
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NRules pricing
NRules fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Decision modeling | Rules |
| Deployment options | Self_hosted |
| Decision monitoring | Not verified |
| Decision standards | Proprietary |
| Integration methods | Not verified |
| Business-user authoring | No |
| Deployment | Self-hosted |
| Platforms | Windows, Linux, macOS |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 24 Sep 2026 |
Alternatives to NRules
- IBM Operational Decision ManagerA governed decision platform for teams automating rules across hybrid enterprise environments.9.4
- Progress CorticonA visual rules platform for modeling, testing, and deploying complex decision logic.9.3
- Pega Customer Decision HubOrchestrates real-time customer decisions and personalization across channels.8.9
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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