Platform to simulate, evaluate, optimise and monitor AI agents and LLM applications.
Starts at
Free · paid from $250/mo (USD)
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AI Tools
Once an AI feature reaches production, prompts stop being text in a file and start behaving like code: they need versions, tests, evaluation against a dataset, and a way to change them without a deployment. Prompt engineering tools provide exactly that. They matter most for teams where non-engineers write the prompts and engineers own the consequences.
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Future AGI
Platform to simulate, evaluate, optimise and monitor AI agents and LLM applications.
Free · paid from $250/mo (USD)

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PromptLayer
Prompt management, evaluation and observability platform for AI engineering teams.
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Langfuse
Open-source LLM engineering.
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Promptfoo
Open-source tool for testing, evaluating and red-teaming LLM prompts and applications.
Free plan
Platform to simulate, evaluate, optimise and monitor AI agents and LLM applications.
Starts at
Free · paid from $250/mo (USD)
Open-source workspace for prompt engineering, evaluation and observability of LLM agents.
Starts at
Free plan
Prompt management, evaluation and observability platform for AI engineering teams.
Starts at
Free plan
Open-source LLM engineering.
Starts at
Free plan
Open-source tool for testing, evaluating and red-teaming LLM prompts and applications.
Starts at
Free plan
AI evaluation and observability platform for standardising LLM evals and production monitoring.
Starts at
Free plan
Chrome extension for folders, search and export across ChatGPT, Gemini, Claude and Grok
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Free plan
Platform for prompt engineering, evaluation and observability of AI agents.
Starts at
Free plan
LLM reliability platform providing tracing, evaluation and monitoring for AI applications.
Starts at
Free plan
AI gateway and collaboration platform for building, testing and deploying LLM applications.
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Paid plans
Ordered by App Advisor rating. Nothing here is paid placement — see how we rate software.
Insist on evaluation, not just a playground. A tool that only helps you write prompts leaves you guessing about whether a change improved anything.
Check who can safely edit. The point of separating prompts from code is letting product people iterate, which needs review and rollback.
Look at how it handles regression: a prompt change that fixes one case and breaks four others is the normal failure mode.
Schedule a demo
They are platforms for managing prompts as production assets — versioning them, testing them against datasets, comparing models, scoring outputs and deploying changes without shipping new code.
Not on day one. They become worthwhile as soon as more than one person edits prompts, or when you cannot tell whether last week's change made quality better or worse.
Observability watches what happened in production; prompt tooling is where you change and test things before that. Most vendors now do both, which is why the categories are converging.
Need help choosing?
Tell us about your business and we send a shortlist with honest pros and cons, then arrange demos. Free — the vendor invoices you directly.