LangFastLangfa.st
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Related Products
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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.
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About
AI agents fail silently in production. Wrong answers, broken loops, cost spikes, behavior drift after a prompt change, and no stack trace to explain why.
Netra is the single platform to trace, evaluate, simulate and security test your agents. Built for text, voice, image and video agents.
SOC2 Type II certified. GDPR and HIPAA compliant. US and EU data residency.
Integrates with: LangChain, LangGraph, CrewAI, LlamaIndex, OpenAI, Anthropic, Gemini, AWS Bedrock, and 30+ more.
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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
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Supported
iPhone
Not Supported
iPad
Not Supported
Android
Supported
Chromebook
Not Supported
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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.
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Audience
Teams building AI agents and Agentic AI products
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Supported
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Screenshots and VideosNo images available
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Screenshots and VideosNo images available
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Pricing
$60 one time
Free Version
Not Supported
Free Trial
Supported
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Pricing
$39/month
Free Version
Not Supported
Free Trial
Supported
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Reviews/
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Reviews/
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Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationLangfa.st
Founded: 2025
United States
langfa.st/new
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Company InformationNetra
Founded: 2025
getnetra.ai/
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Alternatives |
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Categories |
Categories |
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Integrations
CrewAI
Not Supported
LangChain
Not Supported
LlamaIndex
Not Supported
OpenTelemetry
Not Supported
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Integrations
CrewAI
Supported
LangChain
Supported
LlamaIndex
Supported
OpenTelemetry
Supported
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