1stProtect.ai vs Sublime Security Sublime Rules: Side-by-Side Comparison (2026)

1stProtect.ai: Runtime enforcement platform with 22 modules on one SIGMA engine, offline-capable. built by 1stProtect.ai. Core capabilities include Single user-space SIGMA engine replacing multiple legacy security engines (EPP, EDR, DLP, IAM, ITDR, SASE), 22 protection modules covering credential theft, ransomware, data exfiltration, process injection, browser attacks, and agent self-defense, Offline-first policy enforcement with local policy engine cached in kernel memory — no cloud dependency required..

Sublime Security Sublime Rules: Open-source detection rules for email attacks like BEC, phishing, and malware. built by Sublime Security. Core capabilities include Detection rules for email attacks, Business email compromise (BEC) detection, Credential phishing detection..

Both serve the Detection Engineering market but differ in approach, feature depth, and target audience.

1stProtect.ai differentiates with Single user-space SIGMA engine replacing multiple legacy security engines (EPP, EDR, DLP, IAM, ITDR, SASE), 22 protection modules covering credential theft, ransomware, data exfiltration, process injection, browser attacks, and agent self-defense, Offline-first policy enforcement with local policy engine cached in kernel memory — no cloud dependency required. Sublime Security Sublime Rules differentiates with Detection rules for email attacks, Business email compromise (BEC) detection, Credential phishing detection.

1stProtect.ai is developed by 1stProtect.ai. Sublime Security Sublime Rules is developed by Sublime Security. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

1stProtect.ai and Sublime Security Sublime Rules serve similar Detection Engineering use cases: both are Detection Engineering tools. Key differences: 1stProtect.ai is Commercial while Sublime Security Sublime Rules is Free. Review the feature comparison above to determine which fits your requirements.