Best Prompt Engineering Tools with a Free Trial

Latitude is an open-source prompt engineering platform designed to help product teams build, evaluate, and deploy AI models efficiently. It allows users to import and manage prompts at scale, refine them with real or synthetic data, and track the performance of AI models using LLM-as-judge or human-in-the-loop evaluations. With powerful tools for dataset management and automatic logging, Latitude simplifies the process of fine-tuning models and improving AI performance, making it an essential platform for businesses focused on deploying high-quality AI applications.

Prompts are becoming a powerful new way of programming AI models like DALL·E, Midjourney & GPT. However, it's hard to find good-quality prompts online. If you're good at prompt engineering, there's also no clear way to make a living from your skills. PromptBase is a marketplace for buying and selling quality prompts that produce the best results, and save you money on API costs. Find top prompts, produce better results, save on API costs, and sell your own prompts. PromptBase is an early marketplace for DALL·E, Midjourney, Stable Diffusion & GPT prompts. Sell your prompts on PromptBase and earn from your prompt crafting skills. Upload your prompt, connect with Stripe, and become a seller in just 2 minutes. Start prompt engineering instantly within PromptBase using Stable Diffusion. Craft prompts and sell them on the marketplace. Get 5 free generation credits every day.

Prototype and productionize generative AI apps, built for engineers, not just ML practitioners. No more switching between platforms or wrestling with different APIs, focus on creating, not configuring. Use a familiar interface to prompt engineer and work with AI. Use parameters to easily streamline your workbooks into reusable templates. Create workflows by chaining model outputs from LLMs, image, and audio models. Create organizations to manage workbooks amongst your teammates. Share your workbook to the public or specific organizations you define with your team. Comment on workbooks and easily review and compare workbooks with your team. Develop templates for yourself, your team, or the broader developer community, get started quickly with templates to see what people are building.

Simplify prompt edits, version control, and SDK integration in one place. No more scattered tools or waiting on deployments for changes. Explore features crafted to streamline your workflow and elevate prompt engineering. Manage your prompts and projects in a structured way, with tools designed to keep everything organized and accessible. Dynamically adapt your prompts to fit the context of your application, enhancing user experience with tailored interactions. Seamlessly incorporate prompt management into your current development environment with our user-friendly SDK, designed for minimal disruption and maximum efficiency. Leverage detailed analytics to understand prompt performance, user engagement, and areas for improvement, informed by concrete data. Invite team members to collaborate in a shared environment, where everyone can contribute, review, and refine prompts together. Control access and permissions within your team, ensuring members can work effectively.

Maxim is an agent simulation, evaluation, and observability platform that empowers modern AI teams to deploy agents with quality, reliability, and speed. Maxim's end-to-end evaluation and data management stack covers every stage of the AI lifecycle, from prompt engineering to pre & post release testing and observability, data-set creation & management, and fine-tuning. Use Maxim to simulate and test your multi-turn workflows on a wide variety of scenarios and across different user personas before taking your application to production. Features: Agent Simulation Agent Evaluation Prompt Playground Logging/Tracing Workflows Custom Evaluators- AI, Programmatic and Statistical Dataset Curation Human-in-the-loop Use Case: Simulate and test AI agents Evals for agentic workflows: pre and post-release Tracing and debugging multi-agent workflows Real-time alerts on performance and quality Creating robust datasets for evals and fine-tuning Human-in-the-loop workflows

PromptDC is an AI‑powered prompt engineering extension that integrates directly into your favorite web‑based and local AI platforms, such as Lovable, Bolt.new, Replit, V0, Cursor, and Windsurf, to rewrite, enhance, and structure your prompts for maximum accuracy without ever leaving the interface. Once installed, you simply type your original instruction into any supported text field and click “Enhance”; PromptDC reads the underlying system prompt of the host platform, refines your wording to match its expectations, and returns a clearer, more effective version that drives higher‑quality AI outputs. Beyond on‑the‑fly enhancement, the tool offers a centralized workspace for creating, organizing, and testing prompt templates across use cases, content creation, coding assistance, marketing campaigns, data analysis, and more, while providing best‑practice guidance to help you overcome creative blocks and optimize workflows.

AI Tools Kit is a Productive AI, Writing, Seo, Social media & Marketing tools all-in-one Platform which provides FREE tools such as AI Art Generator, Prompt Engineering Tool, AI Undetectable Rewriter, Keyword Research Tool (CPC, Search Vol & Difficulty), AI Image Optimizer, Text to Speech Pro, ChatGPT4 (launching soon), Image Background Remover, Instagram Hashtags Generator, Image Quality Enhancer, Trending Youtube tags, URL Shortener, Backlink Maker, QR Code Generator, Keywords Provider for Particular Search Engine, Website's SEO Report Generator, Free Plagiarism Checker, Password Strength Checker, Speech to Text Converter, Online Pdf Editor, Image Texts Extractor, AI Based Content Generator and 50+ More.

The prompt engineering platform to experiment with different prompt versions, evaluate and compare prompts across a suite of tests, optimize prompts with one-click, share, and more. Optimize your AI development workflow. Key features to help you get and identify the best prompts for your production use cases. Side-by-side comparison of prompts across test cases with evaluation. CSV import test cases, and define custom evaluation metrics. Improve LLM results with automatic prompt and template optimization. View and manage all prompt versions and create OpenAI functions. Access all of your prompts programmatically, including observability and analytics. Determine the costs, latency, and efficacy of each prompt. Start enhancing your prompt engineering workflow with Parea today. Parea makes it easy for developers to improve the performance of their LLM apps through rigorous testing and version control.

Braintrust is the enterprise-grade stack for building AI products. From evaluations, to prompt playground, to data management, we take uncertainty and tedium out of incorporating AI into your business. Compare multiple prompts, benchmarks, and respective input/output pairs between runs. Tinker ephemerally, or turn your draft into an experiment to evaluate over a large dataset. Leverage Braintrust in your continuous integration workflow so you can track progress on your main branch, and automatically compare new experiments to what’s live before you ship. Easily capture rated examples from staging & production, evaluate them, and incorporate them into “golden” datasets. Datasets reside in your cloud and are automatically versioned, so you can evolve them without the risk of breaking evaluations that depend on them.

Good prompt engineering is essential to getting the desired outcome from AI tools. Access thousands of industry-specific prompts generated by AI Keytalk. With expressions collected from people’s reviews of 88,000+ movies and TV shows, you can engineer the perfect idea for your next project. Use AI Keytalk prompts to get everything you need to plan your next movie or TV show. Collaborate easily from the get-go with a comprehensive production planning complete with movie references, cast and crew suggestions, and many more. Use AI Keytalk prompts to build a storyline and bring characters to life. Reference thousands of prompts specific for plot development, character building, writing style, and climax, compiled from existing novels and comics. Use AI Keytalk prompts to get the right prompts to describe the art direction for your movie poster, scene development, character concepts, and many more. Combine it with generative AI tools to build references for more effective collaboration.

DagsHub is a collaborative platform designed for data scientists and machine learning engineers to manage and streamline their projects. It integrates code, data, experiments, and models into a unified environment, facilitating efficient project management and team collaboration. Key features include dataset management, experiment tracking, model registry, and data and model lineage, all accessible through a user-friendly interface. DagsHub supports seamless integration with popular MLOps tools, allowing users to leverage their existing workflows. By providing a centralized hub for all project components, DagsHub enhances transparency, reproducibility, and efficiency in machine learning development. DagsHub is a platform for AI and ML developers that lets you manage and collaborate on your data, models, and experiments, alongside your code. DagsHub was particularly designed for unstructured data for example text, images, audio, medical imaging, and binary files.

Velocity is an AI-powered platform designed to enhance the effectiveness of AI-generated content by transforming basic instructions into powerful, contextually rich prompts. This tool streamlines the prompt engineering process, enabling users to generate smarter prompts effortlessly. By integrating seamlessly into existing workflows, Velocity allows users to elevate their AI interactions without requiring extensive manual input. The platform is accessible through a user-friendly interface, with login options available for registered users. Additionally, Velocity maintains an active presence on social media platforms, providing updates and engaging with the community. Explore endless possibilities and make your creative projects stand out with minimal effort. Streamline your workflow with professional-grade prompts optimized for business use. Simplify research, generate ideas, or prepare lesson plans with precision and creativity.

Prompt optimization, automated voice testing, monitoring, and more. Test your AI voice agent against 1000s of simulated users in minutes. AI voice agents are hard to get right. A small change in prompts, function call definitions or model providers can cause large changes in LLM outputs. We're the only end-to-end platform that supports you from development to production. You can store, manage, version, and keep your prompts synced with voice infra providers from Hamming. This is 1000x more efficient than testing your voice agents by hand. Use our prompt playground to test LLM outputs on a dataset of inputs. Our LLM judges the quality of generated outputs. Save 80% of manual prompt engineering effort. Go beyond passive monitoring. We actively track and score how users are using your AI app in production and flag cases that need your attention using LLM judges. Easily convert calls and traces into test cases and add them to your golden dataset.

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.