--- title: "promptflow vs langstream" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/microsoft-promptflow-vs-rogeriochaves-langstream" tools: ["microsoft-promptflow", "rogeriochaves-langstream"] --- # promptflow vs langstream *GraphCanon updated Aug 7, 2026* ## Verdict Pick promptflow if promptflow is a development framework catered towards creating LLM applications through all stages of development, including initial prototyping and ongoing monitoring; pick langstream if langStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. [promptflow](https://microsoft.github.io/promptflow/) reports 11k GitHub stars, 1.1k forks, and 72 open issues, last pushed Jul 9, 2026. [langstream](https://rogeriochaves.github.io/langstream/) has 417 stars, 28 forks, and 3 open issues, last pushed Jan 3, 2024. Figures are from public GitHub metadata via [promptflow's repository](https://github.com/microsoft/promptflow) and [langstream's repository](https://github.com/rogeriochaves/langstream). | | [promptflow](/tools/microsoft-promptflow.md) | [langstream](/tools/rogeriochaves-langstream.md) | | --- | --- | --- | | Tagline | Build high-quality LLM apps from prototyping to production deployment and monitoring | Build robust LLM applications with true composability | | Stars | 11,193 | 417 | | Forks | 1,113 | 28 | | Open issues | 72 | 3 | | Language | Python | Python | | Adopt for | Promptflow is a development framework catered towards creating LLM applications through all stages of development, including initial prototyping and ongoing monitoring. | LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. | | Persona | - | - | | Runtime | - | - | | License | MIT | MIT | | Categories | Developer Tools, LLM Frameworks | Developer Tools, LLM Frameworks | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [promptflow](/tools/microsoft-promptflow.md) | [langstream](/tools/rogeriochaves-langstream.md) | | --- | --- | --- | | Maintenance | Active (82%) | Dormant (18%) | | Days since push | 17d | 946d | | Open issues (now) | 72 | 3 | | Owner type | Organization | User | | Full report | [trust report](/tools/microsoft-promptflow/trust.md) | [trust report](/tools/rogeriochaves-langstream/trust.md) | ## Shared compatibility - **Python**: [promptflow](/tools/microsoft-promptflow.md) - Python runtime; [langstream](/tools/rogeriochaves-langstream.md) - Python runtime ## Decision facts: promptflow - **Adopt for:** Promptflow is a development framework catered towards creating LLM applications through all stages of development, including initial prototyping and ongoing monitoring. ## Decision facts: langstream - **Adopt for:** LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. ## Choose when ### Choose promptflow if… - Tags unique to promptflow: ai-application-development, chatgpt, llm, prompt-engineering. - When you require a comprehensive environment to manage the full lifecycle of LLM applications from ideation to deployment in Python. - More GitHub stars (11k vs 417) - visibility, not fit. ### Choose langstream if… - Tags unique to langstream: composability, modular development, python. - LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability. - Leaner open-issue backlog (3). ## When NOT to use promptflow - If your team prefers or requires tools that support languages other than Python, as Promptflow is exclusively focused on the Python ecosystem. - In cases where a more fragmented toolset with specialized components for different development stages might be preferable to an integrated framework approach. ## When NOT to use langstream - Last GitHub push was 965 days ago (dormant maintenance, Jan 3, 2024). Validate activity before betting a new project on langstream. - Developer Tools: A gateway is overkill when you're pinned to a single provider and model. - LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. ## Common questions ### What is the difference between promptflow and langstream? promptflow: Build high-quality LLM apps from prototyping to production deployment and monitoring. langstream: Build robust LLM applications with true composability. See the comparison table for live GitHub stats and shared categories. ### When should I choose promptflow over langstream? Choose promptflow over langstream when Tags unique to promptflow: ai-application-development, chatgpt, llm, prompt-engineering; When you require a comprehensive environment to manage the full lifecycle of LLM applications from ideation to deployment in Python; More GitHub stars (11k vs 417) - visibility, not fit. ### When should I choose langstream over promptflow? Choose langstream over promptflow when Tags unique to langstream: composability, modular development, python; LangStream is a Python-based tool for building robust Language Model (LLM) applications, emphasizing modularity and composability; Leaner open-issue backlog (3). ### When should I avoid promptflow? If your team prefers or requires tools that support languages other than Python, as Promptflow is exclusively focused on the Python ecosystem. In cases where a more fragmented toolset with specialized components for different development stages might be preferable to an integrated framework approach. ### When should I avoid langstream? Last GitHub push was 965 days ago (dormant maintenance, Jan 3, 2024). Validate activity before betting a new project on langstream. Developer Tools: A gateway is overkill when you're pinned to a single provider and model. LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. ### Is promptflow or langstream more popular on GitHub? promptflow has more GitHub stars (11,193 vs 417). Stars measure visibility, not whether either tool fits your constraints. ### Are promptflow and langstream open source? Yes - both are open-source projects on GitHub (promptflow: MIT, langstream: MIT). ### Where can I find alternatives to promptflow or langstream? GraphCanon lists graph-backed alternatives at [promptflow alternatives](/tools/microsoft-promptflow/alternatives) and [langstream alternatives](/tools/rogeriochaves-langstream/alternatives) ([promptflow markdown twin](/tools/microsoft-promptflow/alternatives.md), [langstream markdown twin](/tools/rogeriochaves-langstream/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/microsoft-promptflow-vs-rogeriochaves-langstream.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, promptflow or langstream? promptflow: Active. langstream: Dormant. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for promptflow and langstream? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [promptflow trust report](/tools/microsoft-promptflow/trust); [langstream trust report](/tools/rogeriochaves-langstream/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=microsoft-promptflow`](/api/graphcanon/graph?tool=microsoft-promptflow) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_