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
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

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
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$60 one time
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

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:

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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
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

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

Categories

Integrations

GitHub
Jira
Slack
Zapier

Integrations

GitHub
Jira
Slack
Zapier
Claim LangFast and update features and information
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