AI safety & guardrails
Production controls
Tools for prompt-injection defense, output validation, content filtering, and red-teaming AI systems.
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#01
Lakera Guard
· Lakera Recommended FeaturedAPI-based defense for prompt injection, jailbreaks, data leakage, and harmful content. Trained on the Gandalf adversarial prompt dataset.
AIMenta — For any production LLM application accepting user input, run something like Lakera. The cost of a single bad incident vastly outweighs the protection cost.
Usage-based · Free dev tier; usage-based after · API · Free tier · Since 2021 -
#02
Guardrails AI
· Guardrails AI Decent fitOpen-source framework for output validation and structured output. Validators for PII, toxicity, jailbreak, structured types, and custom rules.
AIMenta — Useful framework for output validation. For inbound prompt-injection defense, pair with Lakera or NeMo Guardrails.
Open source · Free OSS; Pro US$300/mo; Enterprise custom · API · Free tier · Self-host · Since 2023 -
#03
NeMo Guardrails
· NVIDIA Decent fitNVIDIA's open-source toolkit for adding programmable guardrails to LLM apps. Define topical, safety, and security rails declaratively.
AIMenta — Strong open-source choice for declarative safety rules. Worth evaluating with Guardrails AI to find the right fit.
Open source · Free OSS · API · Self-host · Since 2023 -
#04
Protect AI
· Protect AI WatchAI security platform — model scanning, runtime defense, and compliance reporting. Acquired by Palo Alto Networks in 2025; now part of Prisma AI Security.
AIMenta — Watch how the Palo Alto integration plays out. For most teams, simpler tools suffice today.
Enterprise · Enterprise — pricing on request · API · Since 2022