About Curtail

Our Mission

Curtail keeps businesses running by using live traffic analysis to identify defects before software goes live, and detect and isolate security threats before they impact systems.

Our Technology

Curtail is built on NCAST (Network Comparison Application Security Testing), our patented technology for detecting behavioral differences between software versions. NCAST operates at the field level, comparing responses from current and candidate versions in real time. It works inline as a proxy, handles encrypted traffic via TLS proxying, and requires no code changes, SDKs, or agents.

NCAST powers both of Curtail’s products. ReGrade™ uses it to catch regressions during development and merge requests by replaying recorded traffic against candidate builds. ReCover uses it to monitor production traffic in real time, detect anomalies, and divert traffic away from failing services — providing protection across the entire software delivery lifecycle.