Helicone vs Promptfoo: Which is Better in 2026?
Choosing between Helicone and Promptfoo 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
We've tested both tools. Here's who should pick what:
Helicone
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
Best for you if:
- • You want lLM observability
- • You want request logging
Promptfoo
Build secure AI applications with AI security testing integrated into your development workflow.
Best for you if:
- • You want lLM eval framework
- • You want open source
| At a Glance | Helicone | |
|---|---|---|
Starts at | FreeFree tier available | FreeFree tier available |
Best For | API Tools | Security |
Rating | - | - |
Free plan | Yes | Yes |
Choose Helicone or Promptfoo?
Choose Helicone if
Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.
- You want lLM observability
- You want request logging
- Your work is API tools-shaped, not security-shaped
Choose Promptfoo if
Build secure AI applications with AI security testing integrated into your development workflow.
- You want lLM eval framework
- You want open source
- Budget matters (Free vs Free)
- Your work is security-shaped, not API tools-shaped
| Feature | Helicone | Promptfoo |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | No ratings yet | No ratings yet |
| Categories | API ToolsDebugging | SecurityTesting & QA |
In-Depth Analysis
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
- +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
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
- +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
Pricing: Helicone vs Promptfoo
| Plan | Helicone | Promptfoo |
|---|---|---|
| Tier 1 | Free Free | Free Free |
| Tier 2 | $100 month Pro | $50 month Cloud |
| Tier 3 | custom Enterprise | custom Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Helicone pricing and Promptfoo pricing.
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Helicone
Want the highest-rated option?
Neither has ratings yet.
Too early to call on ratings — compare on features and pricing.
Value user reviews?
Neither has ratings yet.
Too early to call — neither has ratings yet.
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?
Helicone is a API tools tool. Promptfoo is in security. Pick the category that matches your needs.
How important are ratings?
Neither has ratings yet.
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 Helicone or Promptfoo better?
Promptfoo is rated in our evaluation. Both are freemium.
What are Helicone and Promptfoo used for?
Helicone: Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.. Promptfoo: Build secure AI applications with AI security testing integrated into your development workflow..
What does Helicone cost vs Promptfoo?
Helicone is freemium (free tier + paid plans). Promptfoo is freemium (free tier + paid plans). Visit their websites for detailed pricing.