--- title: "RulesEngine vs openrpa" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/microsoft-rulesengine-vs-open-rpa-openrpa" tools: ["microsoft-rulesengine", "open-rpa-openrpa"] --- # RulesEngine vs openrpa *GraphCanon updated Sep 20, 2026* ## Verdict Pick RulesEngine if rulesEngine is a .NET-based rules engine with powerful dynamic expression support for complex logic; pick openrpa if openRPA is an open-source RPA tool that supports multiple robots using C# and the OpenFlow platform for management. [RulesEngine](https://microsoft.github.io/RulesEngine/) reports 4.4k GitHub stars, 613 forks, and 54 open issues, last pushed Sep 11, 2026. [openrpa](https://app.openiap.io) has 3.1k stars, 659 forks, and 2 open issues, last pushed Apr 15, 2026. Figures are from public GitHub metadata via [RulesEngine's repository](https://github.com/microsoft/RulesEngine) and [openrpa's repository](https://github.com/open-rpa/openrpa). | | [RulesEngine](/tools/microsoft-rulesengine.md) | [openrpa](/tools/open-rpa-openrpa.md) | | --- | --- | --- | | Tagline | A fast and reliable .NET Rules Engine with extensive Dynamic expression support | Free Open Source Enterprise Grade RPA | | Stars | 4,351 | 3,062 | | Forks | 613 | 659 | | Open issues | 54 | 2 | | Language | C# | C# | | Adopt for | RulesEngine is a .NET-based rules engine with powerful dynamic expression support for complex logic. | OpenRPA is an open-source RPA tool that supports multiple robots using C# and the OpenFlow platform for management. | | Persona | - | - | | Runtime | - | - | | License | MIT | MPL-2.0 | | Categories | Developer Tools | Developer Tools | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [RulesEngine](/tools/microsoft-rulesengine.md) | [openrpa](/tools/open-rpa-openrpa.md) | | --- | --- | --- | | Maintenance | Very active (96%) | Slowing (36%) | | Days since push | 3d | 153d | | Open issues (now) | 54 | 2 | | Stars delta | +22 (30d) | +28 (30d) | | Full report | [trust report](/tools/microsoft-rulesengine/trust.md) | [trust report](/tools/open-rpa-openrpa/trust.md) | ## Decision facts: RulesEngine - **Adopt for:** RulesEngine is a .NET-based rules engine with powerful dynamic expression support for complex logic. ## Decision facts: openrpa - **Adopt for:** OpenRPA is an open-source RPA tool that supports multiple robots using C# and the OpenFlow platform for management. ## Choose when ### Choose RulesEngine if… - License: RulesEngine is MIT, openrpa is MPL-2.0. - Tags unique to RulesEngine: .net, engine, expression-evaluator, nuget. - You require fast execution of rules within a .NET application ### Choose openrpa if… - License: openrpa is MPL-2.0, RulesEngine is MIT. - Tags unique to openrpa: automation, multiple-robots, openflow, rpa. - When you need an open-source solution that can manage multiple robotic tasks simultaneously, without incurring licensing costs typical of proprietary software. ## When NOT to use RulesEngine - When working on non-.NET environments as it is limited to this ecosystem - If your rules are simple and do not need the advanced dynamic expression features ## When NOT to use openrpa - If you require proprietary feature support that is absent from open-source editions, as OpenRPA relies solely on the contributions of its community and backers. - When your project specifically demands a user interface or backend not based on the OpenFlow platform, preferring alternatives like UiPath Orchestrator or Automation anywhere Control Room. ## Common questions ### What is the difference between RulesEngine and openrpa? RulesEngine: A fast and reliable .NET Rules Engine with extensive Dynamic expression support. openrpa: Free Open Source Enterprise Grade RPA. See the comparison table for live GitHub stats and shared categories. ### When should I choose RulesEngine over openrpa? Choose RulesEngine over openrpa when License: RulesEngine is MIT, openrpa is MPL-2.0; Tags unique to RulesEngine: .net, engine, expression-evaluator, nuget; You require fast execution of rules within a .NET application. ### When should I choose openrpa over RulesEngine? Choose openrpa over RulesEngine when License: openrpa is MPL-2.0, RulesEngine is MIT; Tags unique to openrpa: automation, multiple-robots, openflow, rpa; When you need an open-source solution that can manage multiple robotic tasks simultaneously, without incurring licensing costs typical of proprietary software. ### When should I avoid RulesEngine? When working on non-.NET environments as it is limited to this ecosystem If your rules are simple and do not need the advanced dynamic expression features ### When should I avoid openrpa? If you require proprietary feature support that is absent from open-source editions, as OpenRPA relies solely on the contributions of its community and backers. When your project specifically demands a user interface or backend not based on the OpenFlow platform, preferring alternatives like UiPath Orchestrator or Automation anywhere Control Room. ### Is RulesEngine or openrpa more popular on GitHub? RulesEngine has more GitHub stars (4,351 vs 3,062). Stars measure visibility, not whether either tool fits your constraints. ### Are RulesEngine and openrpa open source? Yes - both are open-source projects on GitHub (RulesEngine: MIT, openrpa: MPL-2.0). ### Where can I find alternatives to RulesEngine or openrpa? GraphCanon lists graph-backed alternatives at [RulesEngine alternatives](/tools/microsoft-rulesengine/alternatives) and [openrpa alternatives](/tools/open-rpa-openrpa/alternatives) ([RulesEngine markdown twin](/tools/microsoft-rulesengine/alternatives.md), [openrpa markdown twin](/tools/open-rpa-openrpa/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/microsoft-rulesengine-vs-open-rpa-openrpa.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, RulesEngine or openrpa? RulesEngine: Very active. openrpa: Slowing. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for RulesEngine and openrpa? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [RulesEngine trust report](/tools/microsoft-rulesengine/trust); [openrpa trust report](/tools/open-rpa-openrpa/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=microsoft-rulesengine`](/api/graphcanon/graph?tool=microsoft-rulesengine) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_