# PromptKnit > A prompt engineering tool for building, testing, and comparing AI prompts with smart features and model access. PromptKnit is a prompt engineering platform designed to help developers and AI practitioners build, test, and refine their prompts for large language models. The tool provides a smart prompt builder with features for comparing prompt history, simulating function calls, and managing multiple projects and prompts efficiently. It supports various AI models including GPT-4 and GPT-4-Vision for image prompts. - **Smart Prompt Builder** enables users to craft and iterate on prompts with an intuitive interface that streamlines the development process. - **Inline Variable Groups** allow for dynamic prompt testing with multiple variable combinations to find optimal configurations. - **Function Call Simulation** lets users test and debug function calling capabilities without deploying to production environments. - **Prompt History Comparison** provides the ability to compare different versions of prompts and track changes over time. - **Multi-Model Access** supports basic models on the free tier and advanced models like GPT-4 and GPT-4-Vision on paid plans. - **Credit System** offers monthly credits for running prompts, with options to use your own API keys for unlimited runs on paid plans. - **Project Organization** helps manage prompts across multiple projects with configurable limits based on subscription tier. - **Member Access Control** available on the Pro plan enables team collaboration with controlled permissions. To get started, users can sign up for a free Starter plan which includes 2 projects, 4 prompts per project, and 100 monthly credits. The platform offers a straightforward upgrade path to Plus and Pro plans for users needing more projects, prompts, advanced models, and additional features like priority support and early access to new capabilities. ## Features - Smart prompt builder - Inline variable groups - Function call simulation - Prompt history comparison - Multi-model access - Credit-based usage system - Project and prompt organization - Member access control - Image prompts with GPT-4-Vision - Own API key support ## Integrations OpenAI GPT-4, OpenAI GPT-4-Vision ## Platforms WEB, API ## Pricing Freemium — Free tier available with paid upgrades ## Links - Website: https://promptknit.com - EveryDev.ai: https://www.everydev.ai/tools/promptknit