Pick ChainForge if
prompt researchers who will run ChainForge locally at $0 — not Promptfoo first unless they want a YAML CI red-team harness.
Read the ChainForge pageChainForge vs Inspect AI
Our take
Pick ChainForge if you're prompt researchers who will run ChainForge locally at $0 — not Promptfoo first unless they want a YAML CI red-team harness. 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.
Best for
ChainForge Compare prompts as a graph at $0
Inspect AI A research eval you can inspect at $0
Free plan
ChainForge $0 · web play or local chainforge serve. You pay model APIs
Inspect AI $0 · local CLI + log viewer. You pay model inference and machines
Lowest paid
ChainForge Not published by the vendor
Inspect AI Not published by the vendor
Runs where
ChainForge Hosted
Inspect AI Hosted
Watch out
ChainForge $0 is the app, not OpenAI/Anthropic tokens
Inspect AI $0 is the toolkit, not the model bill
Last checked
ChainForge 2026-10-27 · chainforge.ai
Inspect AI 2026-10-27 · inspect.aisi.org.uk
Which one, then?
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 page