HiddenLayer Alternatives

HiddenLayer starts at Not published. Here are the guardrails & safety tools worth weighing against it, and how they differ on billing and deployment.

  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 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
  5. 5 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
  6. 6 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
  7. 7
    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
  8. 8 Prompt Security logo
    Prompt Security Researched Guardrails & Safety

    Existing SentinelOne customers who want GenAI runtime protection inside their endpoint security platform, and any team where agents calling MCP servers is a live security concern.

    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 HiddenLayer alternatives?

Usually pricing model or deployment. HiddenLayer starts at Not published. Teams also switch when they need free self-hosting, which HiddenLayer does not offer.

What is the closest free alternative to HiddenLayer?

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.