Tool A
Promptfoo
Open-source LLM security, red teaming & evaluation framework
Tool B
Braintrust
Enterprise AI evaluation, prompt playground, and continuous LLM monitoring
Choose this if…
Promptfoo
- 1You need No Signup Required
- 2You need Open Source
- 3You need Works Offline
Choose this if…
Braintrust
- 1Braintrust fits your category use case
- 2You prefer their ecosystem & integrations
Overview
Promptfoo is an open-source CLI and evaluation engine designed for LLM quality assurance, automated red teaming, and security vulnerability scanning. It enables engineering teams to systematically test prompts, agents, and RAG pipelines against prompt injections, jailbreaks, PII leakage, and hallucinations before releasing to production. With Promptfoo, developers write declarative test suites in YAML or JSON, defining test cases, assertion criteria (semantic similarity, regex, LLM-as-a-judge, toxicity), and scoring matrices that integrate directly into GitHub Actions CI/CD pipelines.
Promptfoo supports over 30 LLM providers and custom HTTP endpoints, allowing teams to test OpenAI, Anthropic, Gemini, Bedrock, and self-hosted models side by side. It includes automated adversarial red teaming plugins that generate hundreds of dynamic attack vectors (OWASP Top 10 for LLMs, prompt leak, SSRF, indirect prompt injection). Results can be viewed in a local web viewer or exported as JUnit XML, JSON, and CSV for automated pull request quality gates.
Braintrust is an enterprise-grade AI evaluation, prompt engineering, and LLM observability platform built to help software teams safely iterate and deploy generative AI features to production. It bridges the gap between ad-hoc prompt tweaking and rigorous software engineering CI/CD workflows. With Braintrust, teams run automated evaluation benchmarks on every prompt change, comparing output quality, hallucination rates, and latency across multiple LLM versions before committing changes to production codebases.
The platform features an interactive collaborative prompt playground where non-technical product managers and engineers can experiment with system prompts against real customer test cases. Its runtime proxy captures production logs, auto-flags anomalies, and builds curated regression datasets from live traffic. Braintrust is designed with privacy-first architecture, supporting secure client-side proxying and encrypted evaluation pipelines trusted by high-growth startups and Fortune 500 enterprises.
Features Comparison
22 totalPricing & Plans
Open-source CLI and testing framework with unlimited local evaluations is 100% free.
Enterprise security dashboard, automated vulnerability scanners, and compliance reports available on custom pricing.
Free tier with up to 1,000 evaluations/month, collaborative prompt playground, and basic tracing
Team from $100/mo and Enterprise with custom dataset volume, self-hosted proxy, and SOC 2 security
Pros & Cons
Pros
Open-source and lightweight with fast Node.js CLI execution
Comprehensive automated red-teaming scanner for OWASP LLM vulnerabilities
Seamless CI/CD integration with GitHub Actions and GitLab CI
Supports 30+ LLM providers and custom REST/WebSocket endpoints
Interactive local web dashboard with granular side-by-side diffing
Cons
Running large adversarial red-team test matrices can consume significant API tokens
Enterprise governance and role-based access require paid enterprise tier
Pros
Integrates AI evaluations directly into automated CI/CD testing pipelines
Collaborative prompt playground allows product managers and engineers to align on prompts
Transforms production logs into curated regression test datasets automatically
Supports custom programmatic scorers and LLM-as-a-judge evaluation frameworks
Enterprise-grade security with SOC 2 compliance and encrypted telemetry
Cons
Targeted primarily at professional engineering teams rather than casual solo builders
Team tier subscription starts at $100/mo for growing data volumes
Use Cases
The Verdict
Promptfoo
14/22 features · ⭐4.8
Promptfoo is an open-source CLI and evaluation engine designed for LLM quality assurance, automated red teaming, and security vulnerability scanning. It enables…
Braintrust
9/22 features · ⭐4.8
Braintrust is an enterprise-grade AI evaluation, prompt engineering, and LLM observability platform built to help software teams safely iterate and deploy gener…
Both Promptfoo and Braintrust are capable AI tools serving distinct use cases. Promptfoo leads on raw feature breadth (14 vs 9), making it a stronger choice if you need maximum capability.
Frequently Asked Questions
What is the main difference between Promptfoo and Braintrust?
Promptfoo — "Open-source LLM security, red teaming & evaluation framework" — focuses on code-ai, research-ai, automation-ai, while Braintrust — "Enterprise AI evaluation, prompt playground, and continuous LLM monitoring" — targets agent-ai, productivity-ai. The key differences lie in their feature sets and pricing models.
Is Promptfoo free to use?
Yes, Promptfoo offers a free tier. Open-source CLI and testing framework with unlimited local evaluations is 100% free.
Is Braintrust free to use?
Yes, Braintrust offers a free tier. Free tier with up to 1,000 evaluations/month, collaborative prompt playground, and basic tracing
Which is better: Promptfoo or Braintrust?
It depends on your use case. Promptfoo is rated ⭐4.8 and is best suited for ai-engineers, security-researchers, devsecops. Braintrust is rated ⭐4.8 and is ideal for developers, product-managers, ai-engineers, enterprises, teams. Use this comparison to evaluate features that matter to your workflow.
Does Promptfoo have an API?
Yes, Promptfoo provides API access for developers and integrations.
More AI Matchups
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