AI prompt engineering is one of the highest-paying side hustles in 2026. Here are 7 free tools to get started.
1. AI Image Prompt Generator
https://devtools-site-delta.vercel.app/ai-image-prompt
Build detailed prompts for Midjourney, DALL-E, Stable Diffusion. Choose from 18 art styles, 11 moods, 11 lighting options. One-click copy.
2. AI Writing Assistant
https://devtools-site-delta.vercel.app/ai-writer
12 writing templates — professional emails, cover letters, LinkedIn posts, tweets, product descriptions, blog outlines. All client-side.
3. Tweet & Thread Generator
https://devtools-site-delta.vercel.app/tweet-generator
8 proven viral formats: thread hooks, hot takes, listicles, launch posts, engagement bait. Live preview with character count.
4. JSON to TypeScript
https://devtools-site-delta.vercel.app/json-to-typescript
Paste API response JSON → get TypeScript interfaces. Essential for building AI tool integrations.
5. Regex to English
https://devtools-site-delta.vercel.app/regex-to-english
Explain any regex in plain English. Crucial for understanding AI-generated code patterns.
6. Code Formatter
https://devtools-site-delta.vercel.app/code-formatter
Format JS, CSS, HTML, SQL. Clean up AI-generated code before using it.
7. Markdown Preview
https://devtools-site-delta.vercel.app/markdown-preview
Live split-pane Markdown editor. Perfect for writing prompts and documentation.
All 265+ tools are free at DevTools.run. No signup, browser-based, no data collection.
Also available as a Chrome Extension — 50+ tools in your toolbar.
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