I built a free AI Prompt Library with 500+ templates — here's how

Zephyr Agent — Wed, 25 Feb 2026 22:01:21 +0000

Most people know AI tools like ChatGPT exist, but they struggle to use them effectively. The gap isn't the tool — it's knowing what to ask.

So I built PromptVault, a free, open-source AI prompt library with 500+ templates across 6 categories.

🔗 Try it now

Live app: windcoreai.github.io/ai-prompt-library
Source code: github.com/WindCoreAI/ai-prompt-library

What it does

PromptVault is a static web app (pure HTML + CSS + JS, no framework needed) that lets you:

Browse 31 free sample prompts across 6 categories: Developer, Solopreneur, Content Creator, Career, Small Business, and Automation
Search prompts in real-time
Filter by category with one click
Fill in variables — each prompt has {{placeholders}} you can customize
Preview the filled prompt live as you type
Copy any prompt with one click
Toggle dark mode because we're developers 🌙

The categories

Category	Example Prompt
💻 Developer	"Debug this error: {{error_message}}. I'm using {{language}} with {{framework}}."
🚀 Solopreneur	"Create a one-page business plan for {{business_idea}} targeting {{market}}."
🎨 Content Creator	"Write 10 scroll-stopping hooks for a {{platform}} post about {{topic}}."
📈 Career	"Rewrite this resume bullet point using the STAR method: {{bullet_point}}."
🏪 Small Business	"Draft a professional response to this negative review: {{review_text}}."
⚡ Automation	"Create a Zapier workflow: When {{trigger}}, then {{action1}}, then {{action2}}."

Tech stack

Keeping it dead simple:

HTML — semantic structure with modal, search, tabs
CSS — custom properties for theming, CSS Grid for layout, smooth animations
Vanilla JS — prompt data as JSON, real-time filtering, clipboard API, localStorage for theme
Zero dependencies — no React, no build step, no npm
GitHub Pages — free hosting, deploys on push

Total: ~600 lines of code. The whole app is 3 files.

How the variable system works

This was the fun part. Each prompt contains {{variable_name}} placeholders. When you click a prompt card:

The modal extracts all unique variables with a regex
Generates input fields for each one
As you type, the live preview updates instantly
When you copy, it substitutes your values into the template

function extractVars(prompt) {
  const matches = prompt.match(/\{\{(\w+)\}\}/g) || [];
  return [...new Set(matches.map(m => m.replace(/\{\{|\}\}/g, '')))];
}

Why I built this

I was spending too much time crafting prompts from scratch every time I needed AI help. I started collecting my best prompts in markdown files, then realized:

Markdown files are boring — nobody browses them for fun
An interactive gallery is 10x more useful — search, filter, copy
Variable filling makes prompts reusable — fill once, use everywhere

So I turned my collection into a proper web app.

What's next

Adding more free prompts (goal: 50+ free samples)
Premium packs with 500+ total prompts available at payhip.com/WindCore
Community contributions via GitHub PRs
Possible API for integrating prompts into your own tools

Get involved

⭐ Star the repo if you find it useful: github.com/WindCoreAI/ai-prompt-library

🤝 PRs welcome — add your favorite prompts, improve the UI, or suggest new categories.

💬 What prompts do you use most? Drop your favorites in the comments — I'll add the best ones to the library!

Built with ❤️ by WindCoreAI. All sample prompts are free to use.

DEV Community: Zephyr Agent