LangFast

LangFast

Langfa.st
+
+

Related Products

  • Google AI Studio
    30 Ratings
    Visit Website
  • Checksum.ai
    1 Rating
    Visit Website
  • Apify
    1,441 Ratings
    Visit Website
  • AI Video Cut
    1 Rating
    Visit Website
  • SmartDraw
    562 Ratings
    Visit Website
  • Adobe Firefly
    25,030 Ratings
    Visit Website
  • HubSpot AEO
    47 Ratings
    Visit Website
  • Evertune
    1 Rating
    Visit Website
  • ZipRecruiter
    14,202 Ratings
    Visit Website
  • AuthorityTech
    2 Ratings
    Visit Website

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

Get everything you need to start customizing LLMs and prompts immediately, no PhD required. Starter Kits with model, prompt, and dataset suggestions matched to your use case allow you to begin testing, evaluating, and refining model outputs right away. Experiment with multiple models (proprietary and open source), prompts, and techniques simultaneously to speed up the iteration process. Automated testing and evaluation and AI-powered prompt and refinement suggestions enable you to run many experiments at once to quickly achieve high-quality results. Verta’s easy-to-use platform empowers builders of all tech levels to achieve high-quality model outputs quickly. Using a human-in-the-loop approach to evaluation, Verta prioritizes human feedback at key points in the iteration cycle to capture expertise and develop IP to differentiate your GenAI products. Easily keep track of your best-performing options from Verta’s Leaderboard.

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

Data science teams in search of an AI solution to accelerate the development and deployment of applications and ML models

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:

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
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

Verta
United States
www.verta.ai/

Alternatives

Alternatives

Categories

Categories

Integrations

Codestral
Codestral Mamba
Falcon
Llama 2
Mathstral
Ministral 3B
Ministral 8B
Mistral 7B
Mistral AI
Mistral Large
Mistral NeMo
Mistral Small
Mixtral 8x22B
Mixtral 8x7B
Pixtral Large

Integrations

Codestral
Codestral Mamba
Falcon
Llama 2
Mathstral
Ministral 3B
Ministral 8B
Mistral 7B
Mistral AI
Mistral Large
Mistral NeMo
Mistral Small
Mixtral 8x22B
Mixtral 8x7B
Pixtral Large
Claim LangFast and update features and information
Claim LangFast and update features and information
Claim Verta and update features and information
Claim Verta and update features and information