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A data-grounded look at how these two coding & development tools stack up — to help you pick the right coding & development tool in 2026.
Quick verdict
There's barely a point between Promptfoo and testRigor on our Editor Score. Pick Promptfoo if you want declarative YAML tests for prompts and models; choose testRigor for plain-English, no-code test authoring powered by generative AI and NLP. On pricing, each has a free or freemium plan, so cost isn't the deciding factor here.
| Pricing | Freemium | Freemium |
| Free tier | ||
| Best for | declarative YAML tests for prompts and models | plain-English, no-code test authoring powered by generative AI and NLP |
Test and red-team prompts, agents, and RAG apps
Plain-English AI test automation, no coding required
Choose Promptfoo if…
Choose testRigor if…
It comes down to fit, not a single winner: Promptfoo leans into declarative YAML tests for prompts and models, while testRigor is built for plain-English, no-code test authoring powered by generative AI and NLP. 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.
Promptfoo (freemium) is best for declarative YAML tests for prompts and models, while testRigor (freemium) is best for plain-English, no-code test authoring powered by generative AI and NLP. 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.
Promptfoo 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.