Is Prompt Foundry free to use?

Yes. Prompt Foundry has a free plan — Free tier available; paid plans for production use

Does Prompt Foundry have memory?

No persistent memory — sessions don't carry over by default.

What are the best alternatives to Prompt Foundry?

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Prompt Foundry Review

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Prompt Foundry is a prompt management and evaluation platform with SDKs for Node.js and Python, enabling side-by-side model comparison and production-ready prompt testing.

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Verdict

Prompt Foundry targets developers building AI applications who need structured prompt versioning, multi-model comparison (OpenAI vs Anthropic), and evaluation workflows before production deployment. It occupies a similar space to LangSmith and PromptLayer, with a simpler UX and a free entry point via GPT-4o Mini requiring no API key. Its main limitation is breadth — it's narrowly focused on prompt management and lacks the observability depth of enterprise-grade alternatives.

What it does

The simple prompt management and evaluation tool for your AI application. With SDKs for Node, JavaScript, TypeScript , Python, and more.

Best for

Developers and businesses looking to test and refine AI models

At a glance

Free planYes

Login requiredYes

MemoryNo

VoiceNo

Image generationNo

Group chatNo

Mobile appNo

NSFW policyRestricted

PricingFree + paid — Free tier available; paid plans for production use

Pros & cons

Pros

Side-by-side OpenAI vs Anthropic model comparison
Free trial with GPT-4o Mini — no API key needed
SDKs for Node.js, TypeScript, and Python
Chat conversation testing before production deployment

Cons

Narrower feature set than LangSmith or PromptLayer
Paid tiers required for full production workflows
No observability or tracing beyond prompt evaluation

Related tools

Frequently asked

Is Prompt Foundry free to use?: Yes. Prompt Foundry has a free plan — Free tier available; paid plans for production use
Does Prompt Foundry have memory?: No persistent memory — sessions don't carry over by default.
Can Prompt Foundry do voice or images?: Voice: no. Image generation: no.
What are the best alternatives to Prompt Foundry?: Browse the AI Tools Directory for related tools.

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Notes from users

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