Requirements QualityTool
Try our free Rex AI requirements writing tool that uses advance AI and systems engineering principles. Say goodbye to manual requirement hassles and hello to efficiency with REX, our cutting-edge AI-powered assistant. This tool uses AI and the INCOSE framework to generate a new, well-formed requirement from your input, rated against the 42-Point Guide to Writing Requirements.
Analyse your requirement quality instantly
500 characters remainingIntroducing REX — AI-Powered Requirements Engineering
REX is Reqi's AI assistant built specifically for requirements engineering. It analyses, refines, and generates requirements using the INCOSE 42-point quality framework — so your requirements are unambiguous, verifiable, and traceable from the start.
What REX Can Do
Refine Requirements
Paste any requirement and REX reshapes it against INCOSE quality principles — removing ambiguity, improving structure, and making it verifiable. You get a before-and-after score across 42 quality rules.
Allocate to Systems
REX matches requirements to the correct systems and owners based on your project's architecture. Allocate individually or in bulk — reducing manual effort and the risk of misallocation.
Derive Child Requirements
Generate decomposed child requirements from parent requirements. REX builds the hierarchy so you can manage requirements at every level — from system through to component — with full traceability.
Generate Acceptance Criteria
REX drafts measurable acceptance criteria for each requirement — defining what "done" looks like in terms that can be inspected, analysed, demonstrated, or tested.
Generate ACDs
REX identifies and documents assumptions, constraints, and dependencies for your requirements — surfacing risk items that would otherwise be buried or missed entirely. Learn about ACD registers.
Extract from Documents
Upload any PDF and REX scans, analyses, and extracts a structured list of requirements — eliminating manual data entry from contracts, specifications, and standards documents.
INCOSE 42-Point Quality Assessment
Every requirement REX processes is scored against the INCOSE Guide for Writing Requirements — 42 rules across 14 categories including accuracy, non-ambiguity, singularity, completeness, and quantification. You see the original score, the improved score, and exactly which rules changed.
How it works: Paste a requirement into the tool above. REX returns a refined version, explains what changed and why, and scores both the original and improved requirement across all 42 INCOSE quality rules. You can download the full assessment as a PDF report. View the official INCOSE Guide.
See REX in Action
Refine a Requirement with AI
Watch REX take a poorly written requirement and reshape it into a clear, verifiable, INCOSE-compliant specification — with a full quality score comparison.
Extract Requirements from a PDF
See how REX scans any PDF document and extracts a structured list of project requirements — no manual data entry required.
Built for Enterprise Security
Data Sovereignty
We build bespoke AI solutions that consider data sovereignty and data centre locations. Your sensitive requirements and project data remain secure and compliant with your organisational policies.
Flexible LLM Integration
REX connects to a range of LLM models with enterprise-grade security. We work with customers to tailor solutions — including custom AI capabilities for system architecture, safety analysis, and bulk processing.
Try REX Free — No Sign-Up Required
Use the quality checker above to refine any requirement instantly. Want the full suite — allocation, decomposition, ACD generation, and document extraction?
Start a free project and put REX to work across your entire requirements set.
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