GoRules vs Nected vs LexQ: Choosing the Right Rule Engine in 2026

Why This Comparison Exists

If you're evaluating rule engines in 2026, you've probably come across GoRules, Nected, and LexQ. All three are cloud-based, all three promise to externalize business rules from your application code, and all three have free tiers.

But the differences matter. I built LexQ, so I'm biased — but I'll be honest about where the others are stronger. This isn't a marketing page disguised as a comparison. It's the analysis I wish I had when I started building.

Architecture: Embedded vs. API

This is the most fundamental difference and it shapes everything else.

GoRules is an open-source decision engine. You can embed it as a library (Rust, Python, Node.js) or run it as a standalone service. The core is written in Rust, so performance is excellent. Their JDM (JSON Decision Model) format is well-designed and portable. If you want full control over where your rules execute, GoRules gives you that. The tradeoff: you're responsible for provisioning, scaling, and maintaining the infrastructure yourself.

Nected is a no-code/low-code platform. You define rules through a visual UI, and the execution happens on Nected's cloud. It's designed for non-technical users who want to create and manage rules without writing code — operations teams, product managers, and business analysts. The tradeoff: you're limited by how many rules you can create per tier, regardless of how simple or complex they are.

LexQ is a managed API with a visual console. Rules are defined in the console or via CLI/MCP, and executed through a REST API. The architecture deliberately decouples definition, execution, and deployment — changing a rule doesn't require deploying your application. No infrastructure to manage, no rule count limits, and simulation is built into every tier.

The key distinction: GoRules gives you a tool you host. Nected gives you a platform with guardrails. LexQ gives you an API with a safety net.

Simulation and Testing

This is where the products diverge most sharply — and where the choice often gets made.

GoRules has a built-in simulator in their visual editor. You can test individual decisions with sample inputs. It's fast and integrated into the design experience. However, there's no batch simulation — you can't replay thousands of historical records against a new rule version to see aggregate impact. A/B testing for rules is not available outside the Enterprise tier.

Nected offers rule testing within their UI, but simulation capabilities are limited. The focus is on making rules easy to create, not on validating their impact at scale. There's no A/B testing for rule versions.

LexQ was built around simulation as a core feature, not an afterthought. Three layers, all available on every tier including Free:

1. Dry Run — Test any draft version with a single input before publishing. See exactly which rules fire, which get blocked by conflict resolution, and the full decision trace.
2. Batch Simulation — Replay thousands of historical execution records against a new rule version. Compare match rates, metric deltas, and per-rule statistics side-by-side with the current version.
3. A/B Testing — Split live traffic between two rule versions (e.g., 90/10). Measure real outcomes before promoting the winner. No code deploy required.

If your primary concern is "will this rule change break something in production," this distinction matters more than any other feature on this list. Simulation turns rule changes from a leap of faith into a data-driven decision.

Conflict Resolution

When multiple rules match the same input, what happens?

GoRules uses a decision table / decision graph model. You design the flow explicitly, so conflicts are resolved by structure rather than runtime logic.

Nected handles conflicts through rule priority ordering.

LexQ provides explicit conflict resolution with multiple strategies: FIRST_MATCH, HIGHEST_PRIORITY, and MAX_BENEFIT. You group related rules into exclusive rule groups, choose a strategy, and the engine deterministically selects the winner. Every decision is logged with a full trace showing why each rule was selected or blocked — useful both for debugging and for compliance audits.

Versioning and Deployment

GoRules — If self-hosted, versioning is your responsibility (Git, CI/CD). The cloud version handles deployment, with audit log and diff viewer available on the Business tier (€500/mo).

Nected — Version management through their platform. Version control and rollback require the Growth tier.

LexQ — Git-style versioning built in on all tiers, including Free. Every rule change creates a version with a commit message. The lifecycle is explicit: DRAFT → ACTIVE → DEPLOYED. You can roll back to any previous version with one click, and the deployment history is fully auditable. No tier upgrade required for version control.

AI Agent Integration

This is a 2026 concern that didn't exist two years ago.

GoRules recently added an MCP server and AI copilot features. They're moving fast here. AI copilot and LLM integration are available on the Enterprise tier.

Nected has API access but no dedicated AI agent integration protocol.

LexQ ships a 55-tool MCP server that exposes the entire rule engine API to AI agents — available on all tiers. Connect as a remote server (https://mcp.lexq.io) with OAuth 2.1, or run locally via CLI (lexq serve --mcp). AI agents can create rules, run simulations, deploy versions, and inspect execution history — all through natural language.

The CLI also includes structured AI Agent Skills — documentation that coding agents (Claude Code, Cursor, Windsurf) can read to autonomously manage policies without human intervention.

Pricing

Each product charges for different things, making direct comparison tricky:

• GoRules charges for collaboration features (users, environments, SSO). Rule evaluations are unlimited, but you provision and pay for your own infrastructure — compute, database, and DevOps overhead are not included in the price. Features like audit logs and AI copilot are locked behind the €500/mo Business and Enterprise tiers.
• Nected limits the number of rules you can create (5 → 20 → 50). If your use case requires dozens of rules, you're pushed into higher tiers regardless of invocation volume. Version control requires the Growth tier.
• LexQ limits execution volume but places no cap on rule count. Every feature — simulation, A/B testing, versioning, conflict resolution, MCP server — is included on all tiers. You only upgrade when you need more executions.

When to Choose What

Choose GoRules if:

• You want full control over where rules execute
• Your team can manage self-hosted infrastructure
• You need a decision engine embedded in your application
• Performance at extreme scale is your primary concern

Choose Nected if:

• Your primary users are non-technical (ops, product managers)
• You want the simplest possible rule creation experience
• You don't need pre-deploy simulation or A/B testing

Choose LexQ if:

• You need to validate rule changes before they hit production
• Your team deploys code every time a business rule changes and you want to stop
• You want AI agents to manage rules autonomously
• You need deterministic conflict resolution with full audit trails
• You want every feature available from day one without tier-gating

The Honest Take

Every comparison post ends with "it depends," and this one is no different. But I'll be more specific about what it depends on.

If you're a team of 3 engineers building a fintech product and you change pricing rules weekly, the simulation and A/B testing in LexQ will save you from production incidents. If you're a platform team at a large company that needs to embed a decision engine into a high-throughput pipeline, GoRules' Rust core makes more sense. If you're an ops team that needs non-technical people to manage rules through a visual UI without any engineering involvement, Nected is purpose-built for that.

The worst choice is building your own rule engine from scratch. I've seen teams do it. They always regret it by month six.

→ Try LexQ free at lexq.io → GoRules on GitHub → Nected