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features
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support

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Description

LangFast is a streamlined prompt testing platform aimed at product teams, prompt engineers, and developers working with large language models. It offers immediate access to a customizable prompt playground without requiring signup, making prompt experimentation quick and hassle-free. Users can create, test, and share prompt templates using Jinja2 syntax, while receiving real-time raw outputs directly from the LLM, avoiding complicated API layers. This reduces the friction typically associated with manual prompt testing, allowing teams to validate and iterate faster. Developed by a team experienced in scaling AI SaaS products to millions of users, LangFast provides full control over the prompt development lifecycle. The platform also fosters improved team collaboration by enabling easy sharing and iteration. Its pay-as-you-go pricing ensures users only pay for what they use, keeping budgets under control. LangFast is ideal for teams seeking a flexible, cost-effective solution for prompt engineering.

Description

Introducing Narrow AI: Eliminating the Need for Prompt Engineering by Engineers Narrow AI seamlessly generates, oversees, and fine-tunes prompts for any AI model, allowing you to launch AI functionalities ten times quicker and at significantly lower costs. Enhance quality while significantly reducing expenses - Slash AI expenditures by 95% using more affordable models - Boost precision with Automated Prompt Optimization techniques - Experience quicker responses through models with reduced latency Evaluate new models in mere minutes rather than weeks - Effortlessly assess prompt effectiveness across various LLMs - Obtain benchmarks for cost and latency for each distinct model - Implement the best-suited model tailored to your specific use case Deliver LLM functionalities ten times faster - Automatically craft prompts at an expert level - Adjust prompts to accommodate new models as they become available - Fine-tune prompts for optimal quality, cost efficiency, and speed while ensuring a smooth integration process for your applications.

API Access

Has API No 

API Access

Has API No 

Screenshots View All

No images available

Screenshots View All

No images available

Integrations

GPT-4 No 
GPT-4o No 
Llama 3.1 No 

Integrations

GPT-4 Yes 
GPT-4o Yes 
Llama 3.1 Yes 

Pricing Details

$60 one time
Free Trial Yes 
Free Version No 

Pricing Details

$500/month/team
Free Trial No 
Free Version Yes 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Types of Training

Training Docs No 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Vendor Details

Company Name

Langfa.st

Founded

2025

Country

United States

Website

langfa.st/new

Vendor Details

Company Name

Narrow AI

Founded

2024

Country

United States

Website

www.getnarrow.ai/

Product Features

Alternatives

Alternatives