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.
Bottom line: Promptfoo wins this matchup. Pick Helicone if you need API tools.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, 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 want LLM eval framework
Helicone
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
Best for you if:
- • You want LLM observability
| At a Glance | Helicone | |
|---|---|---|
Starts at | Free Free plan | Free Free plan |
Category | Security Testing & QA | API Tools Debugging |
Rating | n/a | n/a |
Free plan | Yes | Yes |
Watch out for | No public overage pricing for Cloud | Potential overage fees if exceeding Pro tier limits |
Choose Promptfoo or Helicone?
Choose Promptfoo if
- You want LLM eval framework
- You want open source
- Budget matters (Free vs Free)
- You work in security, not API tools
Choose Helicone if
- You want LLM observability
- You want request logging
- You work in API tools, not security
In-Depth Analysis
Promptfoo
Build secure AI applications with AI security testing integrated into your development workflow.
The pricing for Promptfoo is very generous, especially with a robust free tier offering unlimited local evals and all features.
Watch out
No public overage pricing for Cloud
Strengths
- Pro: LLM eval framework
- Pro: Open source
- Pro: Good for testing prompts
- Pro: Active development
- Pro: Good documentation
Weaknesses
- Con: Learning curve
- Con: CLI focused
- Con: Newer tool
- Con: Limited features
- Con: Still maturing
Key features
Helicone
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
Helicone's pricing is quite fair, offering a generous Free tier for initial exploration and a well-priced Pro tier at $100/month for significant production use.
Watch out
Potential overage fees if exceeding Pro tier limits
Strengths
- Pro: LLM observability
- Pro: Request logging
- Pro: Cost tracking
- Pro: Good for AI apps
- Pro: Fair pricing
Weaknesses
- Con: Newer platform
- Con: Limited features
- Con: Still maturing
- Con: Integration effort
- Con: 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.
Key Takeaways
Promptfoo
- Free tier available
- Our pick for this comparison
Helicone
- Better fit for API tools
The Bottom Line
Promptfoo wins this matchup.
Frequently Asked Questions
Is Promptfoo or Helicone better in 2026?
Promptfoo wins this matchup. Pick Promptfoo for security workflows (main strength: LLM eval framework). Pick Helicone for API tools workflows (main strength: LLM observability).
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's paid plans start at Free (Cloud). Helicone's paid plans start at Free (Pro).
What's the main difference between Promptfoo and Helicone?
Promptfoo's main strength: LLM eval framework. Helicone's main strength: LLM observability.