Agen Shield vs LLM Guard: Side-by-Side Comparison (2026)

Agen Shield: Endpoint & browser enforcement layer blocking dangerous AI agent actions pre-execution. built by Agen.co. Core capabilities include On-device pre-execution blocking of out-of-policy AI agent actions, Browser paste detection and blocking of sensitive data into AI tools, Unified policy plane shared across device, browser, and gateway enforcement..

LLM Guard: LLM Guard is a security toolkit that enhances the safety and security of interactions with Large Language Models (LLMs) by providing features like sanitization, harmful language detection, data leakage prevention, and resistance against prompt injection attacks..

Both serve the Agentic AI Security market but differ in approach, feature depth, and target audience.

Agen Shield is developed by Agen.co. LLM Guard is open-source with 2,043 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Agen Shield and LLM Guard serve similar Agentic AI Security use cases: both cover LLM Security. Key differences: Agen Shield is Commercial while LLM Guard is Free, LLM Guard is open-source. Review the feature comparison above to determine which fits your requirements.