kitio.aiPromptfoo vs Evidently AI
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Promptfoo starts at See pricing page and Evidently AI starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Config-based test cases
- Model comparison
- Red-team scans
- CI integration
- Web results viewer
- Built-in metric presets
- Data drift detection
- LLM-as-judge evals
- Interactive reports
- Cloud dashboards
| Feature | Promptfoo | Evidently AI |
|---|---|---|
| Best for | Open-source CLI for testing prompts and red-teaming AI apps | Open-source evaluation and monitoring for ML models and LLM apps |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | See pricing page |
| Free plan | Yes | Yes |
| Made by | OpenAI | Evidently AI |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Promptfoo starts at See pricing page and Evidently AI starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
2 plans
Community
Free
- Open source
- All LLM evaluation features
- Red teaming (10k probes/month)
- Run locally or self-host
Enterprise
Contact sales
- Reports and continuous monitoring
- Issue tracking and remediation
- Dedicated runner
- Assigned deployment engineer
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Promptfoo
- Free and works with any provider
- Strong security testing
- Fits developer workflows
- Owned by a model vendor now
- CLI-first may not suit everyone
- Enterprise pricing not public
Evidently AI
- Covers classic ML and LLMs
- Free open-source core
- Many ready-made tests
- Python-only library
- Cloud needed for team features
- Less agent tracing depth
Which one should you choose?
Choose Promptfoo if you want:
- Free and works with any provider
- Strong security testing
- Fits developer workflows
Watch out: owned by a model vendor now.
Choose Evidently AI if you want:
- Covers classic ML and LLMs
- Free open-source core
- Many ready-made tests
Watch out: python-only library.
Promptfoo vs Evidently AI FAQ
What is the difference between Promptfoo and Evidently AI?
Promptfoo: Open-source CLI for testing prompts and red-teaming AI apps. Evidently AI: Open-source evaluation and monitoring for ML models and LLM apps. Both are models & apis tools.
Is Promptfoo or Evidently AI cheaper?
Promptfoo starts at See pricing page and Evidently AI starts at See pricing page. Check both pricing pages for current plans.
Do Promptfoo and Evidently AI have free plans?
Promptfoo: Yes. Evidently AI: Yes.
Who makes Promptfoo?
Promptfoo is made by OpenAI, based in United States.
Who makes Evidently AI?
Evidently AI is made by Evidently AI.
Which should I choose, Promptfoo or Evidently AI?
Choose Promptfoo if you value free and works with any provider and strong security testing. Choose Evidently AI if you value covers classic ml and llms and free open-source core.