From $49 per month🇺🇸
Prompt registry from New York for editing and versioning prompts without a code release, with evaluations and monitoring.
Prompt flow overview and key facts (October 2026)
Open-source development tools from Microsoft to build LLM flows from prompts and code, test them on datasets and check them in CI/CD.
Free
What is Prompt flow?
Prompt flow is a suite of open-source development tools from Microsoft for building, testing, evaluating and deploying LLM applications. It suits teams, especially on Azure, that want a structured path from prototype to production.
Prompt flow is maintained by Microsoft under the MIT license. Developers create executable flows that link language models, prompts, Python code and tools, debug them with tracing, evaluate them on larger datasets and integrate testing into CI/CD. Flows can be deployed to a serving platform of choice or embedded in an application. The packages promptflow and promptflow-tools install with pip; Python 3.9 to 3.11 is recommended. A cloud version is part of Azure AI for team collaboration. As of September 28, 2026 the repository had about 11,200 GitHub stars, with a last push on August 26, 2026.
Prompt flow AI features and use cases
- Builds LLM workflowsFlows chain model calls, prompts and Python steps into one executable unit. Teams move from a single prompt to a tested application without switching tools.
- Traces model interactionsTracing records each call to a language model with inputs and outputs. Developers find where a flow goes wrong and fix the right step.
- Evaluates at scale in CI/CDFlows run over larger datasets to measure quality and performance, and these tests can run in CI/CD. Prompt changes are checked automatically before release.
What sets Prompt flow apart
- Local open-source tooling with an optional cloud counterpart in Azure AI.
- Covers the full cycle from prototyping and tracing to evaluation and deployment.
- Recommends older Python versions (3.9 to 3.11), which may matter for new projects.
Where Prompt flow is strongest
United States Available internationally
Open-source project from Microsoft without a country focus; a cloud version is available in Azure AI.
Questions to ask before you buy Prompt flow
Check the recommended Python versions against your stack. The local tools are free, but model calls and the Azure AI cloud version are billed by the respective provider. Plan who maintains flows and dependencies, since Microsoft offers this repository without a support contract.
Prompt flow reviews
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Questions about Prompt flow
Is Prompt flow free?
Yes. The tools are open source under the MIT license. Model usage and the Azure AI cloud version are billed separately.
How is Prompt flow installed?
With pip install promptflow promptflow-tools; Python 3.9 to 3.11 is recommended.
Can tests run automatically?
Yes. Evaluations can be integrated into CI/CD systems.
Prompt flow update historyno updates yet
No changes recorded for Prompt flow yet.
Changes the vendor made and confirmed user reports, each checked against the vendor's own pages. We review every tool monthly.
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