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Features, pricing and Editor Score side by side — to help you pick the right coding & development tool in 2026.
Quick verdict
Promptfoo edges it by 0.2 on our Editor Score. Pick Helicone if you want proxy-based gateway with one-line integration; choose Promptfoo for declarative YAML tests for prompts and models. On pricing, each has a free or freemium plan, so cost isn't the deciding factor here.
| Pricing | Freemium | Freemium |
| Free tier | ||
| Best for | proxy-based gateway with one-line integration | declarative YAML tests for prompts and models |
Open source LLM observability via a gateway proxy
Test and red-team prompts, agents, and RAG apps
Choose Helicone if…
Choose Promptfoo if…
Your use case decides this one: Helicone leans into proxy-based gateway with one-line integration, while Promptfoo is built for declarative YAML tests for prompts and models. Weigh features and pricing for your workflow. Both have a free or freemium tier, so spin up each and keep the one that clicks.
Neither is universally better — it depends on your budget and which features matter most. The side-by-side breakdown above shows where each one wins.
Helicone (freemium) is best for proxy-based gateway with one-line integration, while Promptfoo (freemium) is best for declarative YAML tests for prompts and models. See the full feature and pricing comparison above.
Both have paid plans — pricing depends on your usage tier. Open each tool's review for current prices, and watch for free trials.
Helicone is usually the easier starting point thanks to a lower barrier to entry. Beginners should favour a free tier and a simple interface over raw power.
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Last updated August 2026. Comparisons are ranked by our Editor Score (features, value and pricing, blended with verified user reviews where a tool has them) — see our methodology.