LangFast

LangFast

Langfa.st
+
+

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About

Klu.ai is a Generative AI platform that simplifies the process of designing, deploying, and optimizing AI applications. Klu integrates with your preferred Large Language Models, incorporating data from varied sources, giving your applications unique context. Klu accelerates building applications using language models like Anthropic Claude, Azure OpenAI, GPT-4, and over 15 other models, allowing rapid prompt/model experimentation, data gathering and user feedback, and model fine-tuning while cost-effectively optimizing performance. Ship prompt generations, chat experiences, workflows, and autonomous workers in minutes. Klu provides SDKs and an API-first approach for all capabilities to enable developer productivity. Klu automatically provides abstractions for common LLM/GenAI use cases, including: LLM connectors, vector storage and retrieval, prompt templates, observability, and evaluation/testing tooling.

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.

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

SaaS Companies, Engineers, Product Engineers, Data Engineers

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.

Support

Phone Support Not Supported
24/7 Live Support Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

API

Offers API Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

$97
Free Version Supported
Free Trial Not Supported

Pricing

$60 one time
Free Version Not Supported
Free Trial 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 Supported
Webinars Not Supported
Live Online Not Supported
In Person Supported

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Klu
Founded: 2022
United States
klu.ai

Company Information

Langfa.st
Founded: 2025
United States
langfa.st/new

Alternatives

Alternatives

Categories

AI Development Supported
AI Fine-Tuning Supported
AI Infrastructure Supported
AI Tools Supported
Generative AI Supported
LLM Evaluation Supported
Prompt Engineering Supported

Categories

Prompt Engineering Supported

Integrations

Airtable Supported
Amazon ElastiCache Supported
Asana Supported
Azure OpenAI Service Supported
Claude for Legal Supported
Confluence Supported
Elastic Supported
GPT-4 Supported
GitHub Supported
Intercom Supported
Jira Supported
Notion Supported
OpenAI Supported
Redis Supported
Salesforce Supported
Slack Supported
Snowflake Supported
YouTube Supported
Zendesk Supported
Zoom Supported

Integrations

Airtable Not Supported
Amazon ElastiCache Not Supported
Asana Not Supported
Azure OpenAI Service Not Supported
Claude for Legal Not Supported
Confluence Not Supported
Elastic Not Supported
GPT-4 Not Supported
GitHub Not Supported
Intercom Not Supported
Jira Not Supported
Notion Not Supported
OpenAI Not Supported
Redis Not Supported
Salesforce Not Supported
Slack Not Supported
Snowflake Not Supported
YouTube Not Supported
Zendesk Not Supported
Zoom Not Supported
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