Prove every change before it ships.
LexQ is the Decision Operations Platform for engineering teams. Test rule changes on real production traffic. Understand every decision with full trace. Deploy with confidence. No more blind changes to business logic.
Sample data. Define, test, and deploy business rules without touching application code.
The Problem
Business logic has no staging environment.
You see what a rule change does only after real traffic hits it.
No Way to Preview the Impact
You change a pricing threshold or eligibility rule, and find out it's wrong from production incidents, not from testing.
Rules Buried in Code
Business logic scattered across services. Changing one condition means a PR, code review, and full deploy cycle.
Engineering Bottleneck
Every rule change is a dev ticket. Product and ops teams wait weeks for what should take minutes.
if-else Spaghetti That No One Owns
Business logic grows into nested conditionals that nobody wants to touch. Each hotfix adds more branches. Technical debt compounds silently.
Talk to the founder
Send me your messiest business rule.
No sales call. No SDR. I'm the engineer who built LexQ. Send me your case and I'll show you how I'd model it, within 24h. Free.
Sanghyun, building LexQ solo from South Korea
AI-Native
Manage rules from the AI you already use.
Create decisions, run Impact Simulations, and deploy, all from Claude, VS Code, or any MCP-compatible agent.
Sample data. MCP server for AI agent integration (Claude, Cursor, any MCP client).
Features
Rule changes don't touch application code.
Version-controlled decision operations with built-in Impact Simulation, Decision Replay, and an immutable record of every decision.
Test Before You Deploy
Run Impact Simulation against real execution data. Compare versions side-by-side to see exactly what would change, without sending a single request to production.
Replay Past Decisions
Re-run last month's real traffic against a candidate version with Decision Replay. See exactly which decisions flip, and why, before anything ships.
Git-style Rule Versioning
Draft, review, and publish rules with full version history. Roll back any change instantly. Every edit is tracked with who, when, and why.
Visual Rule Builder
Create and manage complex business rules through an intuitive console. Conditions, actions, and priorities: fully visual, fully traceable.
Confident Deployment Pipeline
Deploy rule changes in seconds, not sprints. Gradual rollout with traffic controls lets you go live with confidence.
Decision Provenance & Immutable Audit
Every decision keeps its full trace (the rule that fired, the inputs, the version), recorded at the moment of execution and kept immutable for up to 730 days. Answer an auditor with a lookup, not archaeology.
Domain Templates
Start with rules you can run right away.
Fact definitions, sample rules, and sample requests with the responses they produce.
How It Works
From draft to production
Define Your Rules
Create rule groups through the visual console. Set conditions, actions, priorities, and mutex groups, with every step traceable.
Test with Impact Simulation
Run Impact Simulation against historical data or custom test cases. See exactly how your rules behave before they touch production.
Deploy with Confidence
Push changes live instantly. Use traffic controls for gradual rollout. Understand execution in real-time with full audit trails.
Pricing
Priced by execution volume
Start free. Scale as your usage grows.
Free
For developers evaluating the Decision Operations Platform.
- 1,000 executions/mo
- 100 simulated records/mo
- 100 replayed records/mo
- 10 TPS max
- 30-day audit retention
- Documentation & FAQ
Growth
For teams running decision-driven workflows.
≈ 3,300 decisions/day: pricing and eligibility checks for a production service.
- 100,000 executions/mo
- 10,000 simulated records/mo
- 10,000 replayed records/mo
- 100 TPS max
- 180-day audit retention
- Overage: $0.004/exec, $0.015/simulated record, $0.008/replayed record
- Email support
Pro
For platforms with high-volume decision execution.
≈ 33,000 decisions/day: per-transaction risk scoring and entitlement checks.
- 1,000,000 executions/mo
- 100,000 simulated records/mo
- 100,000 replayed records/mo
- 500 TPS max
- 730-day audit retention (365-day live + 1-year archive)
- Fail-open policy
- Overage: $0.002/exec, $0.008/simulated record, $0.004/replayed record
- Priority support
Enterprise
For organizations with compliance and custom volume needs.
- Unlimited executions
- Unlimited simulations
- Unlimited replays
- Custom TPS
- Multi-year audit retention
- SLA & dedicated support
Move one rule out of your code.
Create your free account and treat business decisions like production code: test before you ship, understand every decision, deploy with confidence.
Start Free