Show HN: Free AI Prompt Gen – A local-first, open-source prompt engineering tool

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AI Prompt Generator Free | Best AI Prompt Writer & ToolsSaved PromptsSettings

Free & Open Source<br>Build better prompts.Every time.<br>A rule-based prompt engineering wizard that teaches you why each field matters — not a black box that wraps an AI call.<br>Start buildingSee an example

Step 1Pick your goal.

✍️WritingBlog posts, emails, stories, docs💻CodingDebug, write, review, explain code🎨Image GenAI art prompts, product photos🎥Video GenSora, Runway, AI video prompts📊DataAnalysis, SQL, visualization🔬ResearchPapers, literature, concepts📢MarketingAds, landing pages, social posts⚙️CustomBuild from scratch

Framework?

RTF· Role—Task—FormatCO-STAR· Context—Objective—Style—Tone—Audience—ResponseTAG· Task—Action—GoalAPE· Action—Purpose—Expectation<br>The simplest and most versatile framework. Define who the AI should be, what it should do, and how it should format the answer.

Target Model?

Generic / AnyChatGPTClaudeGemini<br>Clean labeled sections — works well with any AI model.

Step 2Fill in your prompt.

TemplatesReset

Role / Persona?

Context / Background?

TaskRequired?

Output Format?

Tone / Style?

Constraints?

Examples (Few-Shot)Optional?

Live PreviewGeneric / Any<br>Copy.txtSave

Start typing to see your prompt here…

Why this works<br>🏗️The RTF framework (Role-Task-Format) gives you the three most impactful prompt levers in the simplest structure.<br>✨Start filling in the fields above to see how each one strengthens your prompt. Every field you add reduces ambiguity.

AI RefineOptional

Configure an AI Provider inSettingsto enable AI refinement.<br>Refine with AI<br>Refining your prompt…<br>Open Settings to update key ↗

AI-Refined VersionCopy

See the difference.<br>❌ Weak✅ Strong

SEO Guide & Documentation<br>Master AI Prompt Engineering with the Best AI Prompt Generator<br>Learn how an intuitive, rule-based ai prompt generator free tool transforms simple ideas into high-performing prompts for ChatGPT, Gemini, Claude, and Midjourney.

What is an AI Prompt Generator?<br>Artificial intelligence models like ChatGPT, Claude, and Google Gemini thrive on clarity, context, and structural precision. An AI Prompt Generator is a specialized tool that transforms vague, one-line requests into engineered, high-performance instructions. Whether you are crafting complex system instructions or generating creative content, using an ai prompt generator free web application ensures your instructions convey role, context, constraints, and target output formats effortlessly.<br>Rather than relying on basic guesswork, an intelligent ai prompt writer leverages battle-tested prompt engineering frameworks such as RTF (Role, Task, Format), CO-STAR (Context, Objective, Style, Tone, Audience, Response), TAG (Task, Action, Goal), and APE (Action, Purpose, Expectation). By structuring your ai prompt upfront, you eliminate hallucination, reduce output iteration time, and extract maximum intelligence from LLMs. The free ai prompt generator runs 100% locally in your browser, preserving privacy while delivering professional results.

Why This Is the Best AI Prompt Generator Tool<br>Among all available ai prompt generator tools , our browser-native application stands out by emphasizing transparency, privacy, and active learning. Instead of acting as an opaque black box that charges monthly subscriptions, this free ai prompt generator teaches you why each framework field matters. You gain full visibility into prompt assembly, live previews, model-specific formatting (ChatGPT Markdown headers, Claude XML tags, Gemini bold labels), and optional client-side AI refinement using your own API key.<br>By combining local browser storage, customizable model targets, before-and-after prompt comparisons, and built-in template libraries, developers, marketers, creators, and researchers agree this is the best ai prompt generator available for daily workflow productivity.

Supported Modalities: Text, Images, Video & Coding Prompts<br>01. TEXT & GEMINI<br>AI Prompt Generator Text & Gemini AI Prompt<br>When working with textual models, precision is essential. Our AI prompt generator text engine helps you set persona, target audience, tone of voice, and format guidelines required for blogs, emails, and research. If you are optimizing for Google's flagship model, generating a tailored gemini ai prompt ensures Gemini's reasoning capabilities are fully unlocked with clear boundaries.

02. IMAGE & ART<br>AI Image Prompt Generator Free<br>Visual generative models like Midjourney, Stable Diffusion, and DALL-E require detailed descriptive language, photographic parameters, and lighting cues. Using our ai prompt generator for images , you can easily combine subjects, camera angles, color palettes, and negative prompts. This AI image prompt Generator free feature empowers digital artists to generate vivid visual assets without trial and error.

03. VIDEO & MOTION<br>Video AI Prompt Generator<br>Generative video engines such as Sora, Runway Gen-2, and Pika Labs demand precise motion dynamics, camera movements, and...

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