Pick Inspect AI if
eval / safety teams who will run Inspect locally at $0 (you bring model API keys) — not Promptfoo first unless they want a YAML CI red-team harness.
Read the Inspect AI pageInspect AI vs Promptfoo
Our take
Pick Inspect AI if you're on a eval / safety team who will run Inspect locally at $0 (you bring model API keys) — not Promptfoo first unless they want a YAML CI red-team harness. Pick Promptfoo if you're on a app team who will run Community for $0 (MIT, self-host) and only buy Enterprise when they need SSO, a shared dashboard, and more than 10k probes.
Best for
Inspect AI A research eval you can inspect at $0
Promptfoo Fail the build before a prompt ships
Free plan
Inspect AI $0 · local CLI + log viewer. You pay model inference and machines
Promptfoo No free plan
Lowest paid
Inspect AI Not published by the vendor
Promptfoo Not published by the vendor
Coding agent
Inspect AI
Promptfoo Eval matrix
Runs where
Inspect AI Hosted
Promptfoo Hosted
Watch out
Inspect AI $0 is the toolkit, not the model bill
Promptfoo Community red team is 10k probes/month
Last checked
Inspect AI 2026-10-27 · inspect.aisi.org.uk
Promptfoo 2026-10-27 · promptfoo.dev/pricing
Which one, then?
Pick Promptfoo if
app teams who will run Community for $0 (MIT, self-host) and only buy Enterprise when they need SSO, a shared dashboard, and more than 10k probes.
Read the Promptfoo page