Promptfoo vs Helicone: Which is Better in 2026?
Choosing between Promptfoo and Helicone comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Promptfoo
Build secure AI applications with AI security testing integrated into your development workflow.
Best for you if:
- • You need security features specifically
- • Integrates AI security testing into CI/CD and development workflows.
- • Automates context-aware attack generation and provides real-time threat intelligence.
Helicone
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
Best for you if:
- • You need API tools features specifically
- • Routes, debugs, and analyzes AI applications.
- • Offers LLM observability and an AI Gateway.
| At a Glance |  Helicone | |
|---|---|---|
Starts at | $50/monthCloud | $100/monthPro |
Best For | Security | API Tools |
Rating | - | - |
Choose Promptfoo or Helicone?
Choose Promptfoo if
Build secure AI applications with AI security testing integrated into your development workflow.
- LLM eval framework
- Open source
- Good for testing prompts
- Budget matters ($50/month vs $100/month)
- Your work is security-shaped, not API tools-shaped
Choose Helicone if
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
- LLM observability
- Request logging
- Cost tracking
- Your work is API tools-shaped, not security-shaped
| Feature | Promptfoo | Helicone |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | ★4.8/5 49 reviews | No ratings yet |
| Categories | SecurityTesting & QA | API ToolsDebugging |
In-Depth Analysis
Promptfoo
Build secure AI applications with AI security testing integrated into your development workflow.
Strengths
- +LLM eval framework
- +Open source
- +Good for testing prompts
- +Active development
- +Good documentation
Weaknesses
- -Learning curve
- -CLI focused
- -Newer tool
- -Limited features
- -Still maturing
Key features
Helicone
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
Strengths
- +LLM observability
- +Request logging
- +Cost tracking
- +Good for AI apps
- +Fair pricing
Weaknesses
- -Newer platform
- -Limited features
- -Still maturing
- -Integration effort
- -Documentation improving
Key features
Pricing: Promptfoo vs Helicone
| Plan | Promptfoo | Helicone |
|---|---|---|
| Tier 1 | Free Free | Free Free |
| Tier 2 | $50 month Cloud | $100 month Pro |
| Tier 3 | custom Enterprise | custom Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Promptfoo pricing and Helicone pricing.
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Promptfoo
Want the highest-rated option?
Neither has user reviews yet.
Go with: Promptfoo
Value user reviews?
Neither has user reviews yet.
Go with: Promptfoo
3 Questions to Help You Decide
What's your budget?
Both are freemium. Pricing won't help you decide here.
What's your use case?
Promptfoo is a security tool. Helicone is in API tools. Pick the category that matches your needs.
How important are ratings?
Neither has user reviews yet.
Key Takeaways
Promptfoo
- Free tier available
- Our pick for this comparison
Helicone
- Better fit for API tools
The Bottom Line
Promptfoo is our pick.
Frequently Asked Questions
Is Promptfoo or Helicone better?
Promptfoo is rated in our evaluation. Both are freemium.
What are Promptfoo and Helicone used for?
Promptfoo: Build secure AI applications with AI security testing integrated into your development workflow.. Helicone: Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis..
What does Promptfoo cost vs Helicone?
Promptfoo is freemium (free tier + paid plans). Helicone is freemium (free tier + paid plans). Visit their websites for detailed pricing.