ChainForge
ChainForge is a local visual prompt-eval graph: you wire Prompt / Inspect / Vis nodes, query several models, and plot which prompt survives injection.
OUR TAKE
Pick ChainForge for prompt researchers who will run ChainForge locally at $0 — not Promptfoo first unless they want a YAML CI red-team harness. $0 is the app, not OpenAI/Anthropic tokens.
Good fit
Prompt researchers who will run ChainForge locally at $0 — not Promptfoo first unless they want a YAML CI red-team harness.
Poor fit
ChainForge
USD, before tax · Checked 2026-10-27 · chainforge.ai
OUR TAKE
Pick ChainForge for prompt researchers who will run ChainForge locally at $0 — not Promptfoo first unless they want a YAML CI red-team harness. $0 is the app, not OpenAI/Anthropic tokens. A 3-model sweep still bills those keys.
Good fit
Prompt researchers who will run ChainForge locally at $0 — not Promptfoo first unless they want a YAML CI red-team harness.
Poor fit
ChainForge
USD, before tax · Checked 2026-10-27 · chainforge.ai
What it costs
USD, before tax · Checked 2026-10-27 · chainforge.ai
ChainForge
MIT. License fee . Web play or local chainforge serve. You pay model APIs
$0
No public hosted $.
Not published by the vendor
Not published by the vendor
Checked 2026-10-27·chainforge.ai
Before you pay
Good fit
Prompt researchers who will run ChainForge locally at $0 — not Promptfoo first unless they want a YAML CI red-team harness.
Watch out
$0 is the app, not OpenAI/Anthropic tokens. A 3-model sweep still bills those keys.
Instead, try
Promptfoo if YAML eval + red team when you want Community Free Forever; Inspect AI if a research log viewer when you want Inspect MIT $0
Compare ChainForge with
Limits, in full
- 01
$0 is the app, not OpenAI/Anthropic tokens. A 3-model sweep still bills those keys.
- 02
Browser play is feature-limited. vs the local install (env keys, Python eval, Dalai local models).
- 03
A visual eval graph, not Promptfoo’s YAML matrix. For that CI harness see Promptfoo.
If ChainForge isn't it
Why: YAML eval + red team when you want Community Free Forever.
Free· open source,MIT
Community red team is 10k probes/monthChecked 2026-10-27·promptfoo.dev/pricing
vs ChainForge
Why: a research log viewer when you want Inspect MIT $0.
Free· open source,MIT
$0 is the toolkit, not the model billChecked 2026-10-27·inspect.aisi.org.uk
vs ChainForge
Why: a Python eval harness when you want DeepEval + Confident AI $0 / $200.
Free· paid from$2/mo
$0 is the library, not judge tokensChecked 2026-10-27·confident-ai.com/pricing
vs ChainForgeLimits & alternatives3 limits · Promptfoo, Inspect AI, DeepEval instead
Limits, in full
- 01
$0 is the app, not OpenAI/Anthropic tokens. A 3-model sweep still bills those keys.
- 02
Browser play is feature-limited. vs the local install (env keys, Python eval, Dalai local models).
- 03
A visual eval graph, not Promptfoo’s YAML matrix. For that CI harness see Promptfoo.
If ChainForge isn't it
Why: YAML eval + red team when you want Community Free Forever.
Free· open source,MIT
Community red team is 10k probes/monthChecked 2026-10-27·promptfoo.dev/pricing
vs ChainForgeWhy: a research log viewer when you want Inspect MIT $0.
Free· open source,MIT
$0 is the toolkit, not the model billChecked 2026-10-27·inspect.aisi.org.uk
vs ChainForgeWhy: a Python eval harness when you want DeepEval + Confident AI $0 / $200.
Free· paid from$2/mo
$0 is the library, not judge tokensChecked 2026-10-27·confident-ai.com/pricing
vs ChainForge