Inspect AI Alternatives

Inspect AI starts at $0 (open source). Here are the eval frameworks tools worth weighing against it, and how they differ on billing and deployment.

  1. 1 Braintrust logo
    Braintrust Hands-on tested Eval Frameworks

    Teams that want turnkey regression testing and CI/CD quality gates without assembling the eval orchestration themselves

    From $249/mo Bills spans
  2. 2 Confident AI logo
    Confident AI Researched Eval Frameworks

    Teams already using DeepEval who need shared datasets, persistence, online evaluation and collaboration, and who are large enough that unlimited seats on a flat plan beats per-seat competitors.

    From $200/mo per org Bills gb-months
  3. 3 Confident AI (DeepEval) logo
    Confident AI (DeepEval) Hands-on tested Eval Frameworks

    Python teams who want pytest-style LLM evals in CI/CD and can either live in the OSS framework or absorb the cloud's pricing steps

    From $200/mo Self-hosts free
  4. 4 Evidently logo
    Evidently Researched Eval Frameworks

    Teams evaluating classical ML and LLM systems together, especially where data drift and data quality matter as much as output quality, and who want CI-integrated declarative testing.

    From Not published Self-hosts free
  5. 5 Giskard logo
    Giskard Researched Eval Frameworks

    Teams that need adversarial testing and red teaming for LLM agents, especially in security-conscious or regulated settings, and who are on Python 3.12 or later.

    From Not published (Hub) Self-hosts free
  6. 6 LM Evaluation Harness logo
    LM Evaluation Harness Researched Eval Frameworks

    Anyone benchmarking base models, comparing fine-tunes against published baselines, or producing numbers that need to line up with academic literature and the Open LLM Leaderboard.

    From $0 (open source) Self-hosts free
  7. 7 Patronus AI logo
    Patronus AI Researched Eval Frameworks

    Enterprises that want evaluation backed by purpose-trained judge models rather than prompted general LLMs, particularly for hallucination detection and agent debugging, and who can work with enterprise procurement.

    From Not published
  8. 8 Promptfoo logo
    Promptfoo Hands-on tested Eval Frameworks

    Security and CI teams who want config-driven LLM eval plus serious red-teaming, from an OSS tool with no seat cost

    From $0 Self-hosts free
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 Inspect AI alternatives?

Usually pricing model or deployment. Inspect AI starts at $0 (open source). Teams also switch when they need free self-hosting, which Inspect AI does offer.

What is the closest free alternative to Inspect AI?

Confident AI (DeepEval) is the strongest option that self-hosts free - Python teams who want pytest-style LLM evals in CI/CD and can either live in the OSS framework or absorb the cloud's pricing steps 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.