LangFast

LangFast

Langfa.st
+
+

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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

Empower tech and non-technical teams to test your LLM apps and ship reliable products faster. Accelerate the LLM app development cycle in up to 45 days. Empower tech and non-technical teams through a collaborative and friendly UI. Gain full visibility into your LLM application's behavior with comprehensive test coverage. Ottic connects with the tools your QA and engineers use every day, right out of the box. Cover any real-world scenario and build a comprehensive test suite. Break down test cases into granular test steps and detect regressions in your LLM product. Get rid of hardcoded prompts. Create, manage, and track prompts effortlessly. Bridge the gap between technical and non-technical team members, ensuring seamless collaboration in prompt engineering. Run tests by sampling and optimize your budget. Drill down on what went wrong to produce more reliable LLM apps. Gain direct visibility into how users interact with your app in real-time.

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

Organizations and businesses wanting a solution to visually manage prompts and monitor user behaviour

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

Pricing

$60 one time
Free Version Not Supported
Free Trial Supported

Pricing

No information available.
Free Version Not 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 Supported
In Person Not Supported

Company Information

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

Company Information

Ottic
United States
ottic.ai/

Alternatives

Alternatives

Pulse QA

Pulse QA

Office Solution

Categories

Prompt Engineering Supported

Categories

AI Testing Tools Supported
Prompt Engineering Supported
QA Testing Supported

Integrations

GitHub Not Supported
Jira Not Supported
Slack Not Supported
Zapier Not Supported

Integrations

GitHub Supported
Jira Supported
Slack Supported
Zapier Supported
Claim LangFast and update features and information
Claim LangFast and update features and information
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