Best Promptfoo Alternatives in 2026

What Promptfoo was doing for your team

Promptfoo is a testing and red-teaming tool — it lets you run automated evals across LLM providers, test prompts against assertions, scan for vulnerabilities, and integrate safety checks into CI/CD pipelines. It runs locally, supports a wide range of LLM providers, and never required a managed service. That combination of vendor neutrality and depth is what the acquisition put in question.

Two different problems

Teams searching for alternatives are usually solving one of two things — or both:

Promptfoo covered the first. Most teams were handling the second with a mix of environment variables, Git, and guesswork. These are different tools for different jobs — and the right answer after the acquisition depends on which problem you're actually solving.

Endprompt — for production prompt management

Endprompt is the infrastructure layer that sits between your application and the LLM. Your app calls one stable endpoint; Endprompt handles prompt rendering, the LLM call, caching, and logging. It's built for the part of the lifecycle that comes after your prompts have been tested.

• Stable API endpoint — your app calls the same URL forever; prompts and models are configuration, not code
• No-deploy prompt updates — change, test, and promote prompt versions from the UI without touching your application
• No LLM provider dependency in your app — switch models without a code change
• Cost tracking by feature — spend tracked at the endpoint level, so you know what each AI feature actually costs
• Automatic caching — repeated queries cached with no code changes; up to 67% cost reduction in repeated-query scenarios
• Full observability — logs, latency, token usage, and estimated cost per request, all by endpoint

Best for: Teams who want prompts managed as production infrastructure — versioned, observable, and fully decoupled from application code.

Garak — for vendor-neutral red teaming

Open-source vulnerability scanner owned and maintained by NVIDIA. Runs probes across a taxonomy of LLM failure modes — prompt injection, jailbreaking, hallucination, data leakage, and toxicity. CI/CD-compatible and model-agnostic. NVIDIA has no commercial stake in which language model you choose.

Best for: Teams that need independent, automated red teaming with no LLM vendor conflict.

Giskard — for open-source AI red teaming

Independent open-source AI red teaming and security platform. Covers hallucination testing, prompt injection detection, and RAG evaluation. European company, no frontier-model parent.

Best for: Teams that want open-source, independent red teaming with strong RAG testing support.

Which one is right for you?

• You need production prompt management — versioning, stable API, cost tracking → Endprompt
• You need vendor-neutral red teaming and vulnerability scanning → Garak
• You need open-source red teaming with RAG support → Giskard
• You need both layers → Endprompt for production management, Garak or Giskard for testing