LangStream
Event-driven framework for building and running LLM applications with no-code and Python.
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is LangStream?
LangStream is a framework designed to build event-driven applications using large language models. It supports both no-code and Python-based development, including integration with LangChain agents, making it suitable for developers looking to create sophisticated AI-powered applications without extensive coding.
Key differentiator
“LangStream stands out as an event-driven framework for LLM applications, offering both no-code and Python-based development options, making it a versatile choice for developers looking to integrate large language models into their projects.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
API requires Python-specific patterns, TypeScript SDK is community-maintained
v0.1 to v0.2 migration required rewriting chain definitions
Core concepts and edge-case examples are not well covered in official docs
Few contributors and plugins available compared to more mature frameworks
Fit analysis
Who is it for?
✓ Best for
Teams looking to build scalable, event-driven LLM applications without extensive coding knowledge
Projects requiring integration with LangChain-based agents for enhanced functionality
Developers who prefer a no-code approach but also need the flexibility of Python scripting
✕ Not a fit for
Applications that require real-time streaming capabilities beyond its current architecture
Teams needing cloud-hosted solutions without self-hosting options
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Alternatives
Next step
Get Started with LangStream
Step-by-step setup guide with code examples and common gotchas.