Promptfoo VS Zed Attack Proxy

• Open source and free to start
  Promptfoo is an open-source tool (MIT licensed) that can be installed and run locally via npm or npx at no cost, making it accessible to individual developers, startups, and teams without procurement hurdles.
• Declarative, config-driven testing
  Test cases, prompts, providers, and assertions are defined in simple YAML (or JSON/code) configuration files. This makes evaluations reproducible, easy to version-control, and straightforward to integrate into CI/CD pipelines.
• Broad model and provider support
  It supports many LLM providers including OpenAI, Anthropic, Google, Azure, AWS Bedrock, and local models such as Ollama, plus custom providers. This lets teams compare models and prompts side by side and avoid vendor lock-in.
• Built-in red teaming and security scanning
  Promptfoo includes automated red teaming and vulnerability scanning features for issues such as prompt injection, jailbreaks, PII leakage, and harmful content, helping teams assess LLM application safety before release.
• Local-first with rich assertions and comparison views
  Evaluations run locally, so prompts and data can stay private, and results can be explored in a web viewer with side-by-side comparisons. A wide set of assertion types, including deterministic checks, LLM-as-judge, similarity, and custom scripts, supports flexible evaluation.

Possible disadvantages

• Learning curve for advanced use
  Basic setups are simple, but advanced features such as custom providers, complex assertions, model-graded metrics, and red team configuration require a fair amount of reading documentation and experimentation.
• Config-heavy workflow can be limiting
  The YAML-centric approach may feel cumbersome for non-technical stakeholders or for highly dynamic, agentic, or multi-step workflows, which may require custom code or providers to evaluate well.
• LLM-as-judge cost and variability
  Model-graded assertions and red teaming can consume many API calls, which raises cost and can produce non-deterministic or biased grading results that need calibration and human review.
• Limited collaboration in the open-source version
  Team features such as shared dashboards, centralized results, access controls, and enterprise support are geared toward the paid or enterprise offering, so the free local tool can be less convenient for larger teams.
• Evaluation-focused rather than full observability
  Promptfoo is mainly for pre-deployment testing and security assessment. It is not a complete production monitoring or tracing platform, so teams often need additional tools for runtime observability and analytics.

• Open Source
  Zed Attack Proxy (ZAP) is open-source software, which means it's free to use and the source code is available for modification and improvement by the community.
• Active Community
  ZAP has a robust and active community that contributes to its continuous improvement, provides support, and develops plugins and extensions.
• Ease of Use
  ZAP is designed to be user-friendly, with a simple and intuitive interface, making it suitable for both beginners and advanced users.
• Comprehensive Toolset
  ZAP offers a wide range of tools and features for automated and manual testing of web applications, including spidering, scanning, proxying, and reporting.
• Cross-Platform
  ZAP runs on multiple platforms, including Windows, Linux, and macOS, providing flexibility for users regardless of their operating system.

Possible disadvantages

• Performance Issues
  ZAP can be resource-intensive, which might lead to performance slowdowns, especially when scanning large applications or using a lot of active scan rules.
• Steep Learning Curve for Advanced Features
  While the basic functions are user-friendly, utilizing advanced features and customizations can require a deeper understanding and can be complex for newcomers.
• Plugin Dependency
  Relying on community-developed plugins can sometimes be problematic if they are not updated in line with the core tool, potentially leading to compatibility issues.
• Limited Commercial Support
  Since ZAP is open source, it lacks dedicated commercial support, which may be a disadvantage for enterprises requiring guaranteed support services.
• False Positives
  As with many security scanning tools, ZAP may generate false positives, which requires manual verification and can add to the time and effort required in a security assessment.

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Tracking Zed Attack Proxy since Mar 2021.