LangFast vs. LangGraph Comparison


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About LangFast is a lightweight prompt testing platform designed for product teams, prompt engineers, and developers working with LLMs. It offers instant access to a customizable prompt playground—no signup required. Users can build, test, and share prompt templates using Jinja2 syntax with real-time raw outputs directly from the LLM, without any API abstractions. LangFast eliminates the friction of manual testing by letting teams validate prompts, iterate faster, and collaborate more effectively. Built by a team with experience scaling AI SaaS to 15M+ users, LangFast gives you full control over the prompt development process—while keeping costs predictable through a simple pay-as-you-go model.	About Gain precision and control with LangGraph to build agents that reliably handle complex tasks. Build and scale agentic applications with LangGraph Platform. LangGraph's flexible framework supports diverse control flows – single agent, multi-agent, hierarchical, sequential – and robustly handles realistic, complex scenarios. Ensure reliability with easy-to-add moderation and quality loops that prevent agents from veering off course. Use LangGraph Platform to templatize your cognitive architecture so that tools, prompts, and models are easily configurable with LangGraph Platform Assistants. With built-in statefulness, LangGraph agents seamlessly collaborate with humans by writing drafts for review and awaiting approval before acting. Easily inspect the agent’s actions and "time-travel" to roll back and take a different action to correct course.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported
Audience Product teams, software engineers, prompt engineers, AI developers, ML researchers, startup founders, and technical writers working on AI-powered features or language model integrations.	Audience AI developers
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Not Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Not Supported	API Offers API Not Supported
Screenshots and Videos No images available	Screenshots and Videos View more images or videos
Pricing $60 one time Free Version Not Supported Free Trial Supported	Pricing Free Open source Free Version Supported Free Trial Not Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software

Training Documentation Not Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information Langfa.st Founded: 2025 United States langfa.st/new	Company Information LangChain Founded: 2022 United States www.langchain.com/langgraph
Alternatives PromptLayer	Alternatives LM-Kit.NET LM-Kit
Literal AI	kama.ai
Lisapet.ai	AG-UI
PromptHub	LangChain
Hamming View All	Agno View All
Categories Prompt Engineering Supported	Categories Agentic AI Supported AI Agent Builders Supported AI Agent Frameworks Supported AI Agents Supported Context Engineering Supported

Integrations AG-UI Not Supported Agent Control Not Supported AgentForge Not Supported Agentspan Not Supported Amazon Bedrock AgentCore Not Supported Amazon Web Services (AWS) Not Supported BAND Not Supported Chroma Not Supported Claude Not Supported Cohere Not Supported Convo Not Supported Crewship Not Supported Elasticsearch Not Supported Hindsight Not Supported LangChain Not Supported LangMem Not Supported LangSmith Not Supported Liona Not Supported OpenUI Not Supported Solarch Not Supported Show More Integrations	Integrations AG-UI Supported Agent Control Supported AgentForge Supported Agentspan Supported Amazon Bedrock AgentCore Supported Amazon Web Services (AWS) Supported BAND Supported Chroma Supported Claude Supported Cohere Supported Convo Supported Crewship Supported Elasticsearch Supported Hindsight Supported LangChain Supported LangMem Supported LangSmith Supported Liona Supported OpenUI Supported Solarch Supported Show More Integrations View All 32 Integrations
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