LLM Guard Alternatives

LLM Guard was archived on 9 July 2026, including its Hugging Face detection models.

If you are still running it, treat migration as scheduled work rather than a backlog item.

  1. 1 Arthur logo
    Arthur Researched Guardrails & Safety

    Teams that want open-source guardrails running inside their own stack with the option of an inexpensive managed tier, and who value published pricing and unlimited seats.

    From $60/mo Bills use-cases Self-hosts free
  2. 2 Fiddler AI logo
    Fiddler AI Researched Guardrails & Safety

    Regulated enterprises that need guardrails running inside their own environment, particularly those already running predictive ML alongside LLM systems, and who can work with enterprise procurement.

    From Not published
  3. 3 Guardrails AI logo
    Guardrails AI Researched Guardrails & Safety

    Teams that want composable, permissively licensed output validation living next to their application code, especially those who prefer plain Python over a policy DSL.

    From $0 (Apache 2.0) Self-hosts free
  4. 4 HiddenLayer logo
    HiddenLayer Researched Guardrails & Safety

    Enterprises and government buyers who need model supply chain security, AI asset discovery and airgapped operation, rather than application-layer output filtering.

    From Not published
  5. 5 Lakera logo
    Lakera Researched Guardrails & Safety

    Teams that want managed, low-latency prompt injection defence with enterprise support and are comfortable with a proprietary API and an enterprise sales process.

    From Not published
  6. 6 NVIDIA NeMo Guardrails logo
    NVIDIA NeMo Guardrails Researched Guardrails & Safety

    Teams building conversational products where the risk emerges across a dialogue rather than in one message, and who want programmable, self-hosted, permissively licensed guardrails.

    From $0 (Apache 2.0) Self-hosts free
  7. 7 Aporia logo
    Aporia Researched Guardrails & Safety

    Existing Coralogix customers, and teams that want AI observability and guardrails correlated with full-stack logs, metrics and traces rather than as a standalone layer.

    From Not published
  8. 8
    CalypsoAI Researched Guardrails & Safety

    Enterprises already buying F5 for application delivery and security, who want AI guardrails integrated into that platform rather than as a separate vendor relationship.

    From Not published
These tools meter differently, so their published prices are not comparable. Model them against your own workload →

Frequently Asked Questions

Why do people look for LLM Guard alternatives?

LLM Guard was archived on 9 July 2026, including its Hugging Face detection models. That is the main reason this search exists, and it makes migration a requirement rather than a preference.

What is the closest free alternative to LLM Guard?

Arthur is the strongest option that self-hosts free - Teams that want open-source guardrails running inside their own stack with the option of an inexpensive managed tier, and who value published pricing and unlimited seats. Free on licence is not free to operate though; you still own the infrastructure and the on-call.

How should I compare the costs?

Not by their published prices, because tools in this category meter different things - spans, events, GB ingested, seats, prompts, or a percentage of provider spend. A $50 plan means something completely different in each case. Model your own request volume and span count through the cost calculator instead.