ReGrade®

Powered by patented NCAST technology

Field-level analysis that catches regressions in API behavior by comparing real traffic across software versions.

How Curtail's ReGrade can help you

  1. Agentic Coding

    AI Agentic Coding & ReGrade MCP

    ReGrade works in-the-loop with your AI coding agent, automatically replaying real traffic against new code and feeding results back so the LLM converges faster.

    • ✓Less token usage per task
    • ✓Faster iteration cycles
    • ✓Fewer hallucinations and regressions
    • ✓Fewer introduced vulnerabilities

  2. Merge Request Analysis

    Automatic Merge Request Analysis

    ReGrade replays recorded production traffic against every merge request, automatically surfacing behavioral and performance differences before code reaches production.

    • ✓Faster, more confident reviews
    • ✓Auditable regression artifacts
    • ✓More insight than pass/fail test results
    • ✓Root cause information for every difference

  3. Language Refactoring

    LLM Language Refactoring & ReGrade

    When LLMs transform code between languages — C to Python and back — ReGrade uses field-level comparison to verify that every version behaves identically, so you can migrate to memory-safe languages with confidence.

    • ✓Memory safety verification
    • ✓Automated equivalence testing
    • ✓Confident language migrations
    • ✓Faster refactoring cycles

Supercharge your AI coding agent

We gave Claude Code the same codebase, the same two known bugs, and the same AI model. One session used ReGrade's structured delta tools. The other used raw traffic replay. Here's what happened.

Ghost CMS v2.2.2 → v2.2.3 · Claude Opus 4.6 · 72 Requests · 3,328 Deltas

  • 3.2× Time Saved
    3m 41s vs 11m 56s
  • 1.8× Cost Reduction
    $2.02 vs $3.57
  • 3.5× Token Efficiency
    1.2M vs 4.1M tokens
  • 96% Root-Cause Quality
    of deltas traced to root cause
Metric Without ReGrade With ReGrade Change
Wall-Clock Time 11m 56s 3m 41s −69%
Estimated Cost $3.57 $2.02 −43%
Total Tokens 4.1M 1.2M −71%
API Calls 79 31 −61%
Tool Calls 48 16 −67%
User Turns 5 4 −20%

With ReGrade's structured delta tools, Claude traced 96% of flagged deltas to a single root cause — using 71% fewer tokens and finishing 3.2× faster than raw replay.

Ghost CMS API benchmark — 72 requests, 3,328 deltas, 2 known bugs. Advantages compound with larger datasets.

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