The Prompt Index · AI Prompt Database

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Write, research, decide and design with 25 AI tools built into one workspace — Agentic Rooms, Decision Lab, PromptBook, Slide Studio, the Writing Assistant and more. Backed by 770+ curated prompts, 2,600+ agent skills and 29 AI courses.

25 AI Tools
770+ Prompts
2,600+ Agent Skills
29 AI Courses
5 AI Databases
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0 181

Gauntlet Loop - Template

I want you to build a {{DESCRIBE_WHAT_YOU_WANT_BUILT}} to an extremley high level. It should be utte…

steves1189 View
0 175

Gauntlet Loop - Original

I want you to build a first-person shooter at the level of the most recent Call of Duty games. It sh…

Matt_Shumer View
158

Competitive Intelligence Claude 4 Prompt

USER: You are a competitive intelligence expert who uncovers what companies are actually building,…

Summers View
133

Expert Conductor — Reasoning Guide for Grok

SYSTEM: You are a conductor of expertise, bringing together the world's foremost minds to collaborat…

Sumer View
132

AI Usage Suggestions

Based on everything you know about me from our full chat history and memory, give me 10 high-leverag…

funnydoggy View
130

AI Course Architect: 5-Part Outline Generator

Your primary objective is to function as an expert instructional designer and curriculum architect…

marcosdecastro View

What You Actually Get

25 AI tools in one workspace, and the prompt library that feeds them

25 AI Tools, One Workspace

Research, writing, decisions, images, slides, audio and agents — all under one login, with your work saved in one place. Every plan includes the whole suite; the plan only sets how much you can run.

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The Full Suite

Prompt Database

770+ curated prompts for ChatGPT, Claude and Gemini

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Most Popular

Agentic Rooms

Put a board of AI advisors on your decision and let them argue it out

Open a Room
Flagship

Decision Lab

Turn a pile of documents into an evidence-backed decision brief you can hand to someone else

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Basic + Pro

Sheet Scorer

Put a score and a reason on every row of a CSV or Excel file

Score a File
New

PromptBook

Write and publish a full book, cover and all, ready for Kindle

Start a Book

AI Writing Assistant

Draft and edit in your own voice, with tracked suggestions

Start Writing

Skills Database

2,600+ SKILL.md files to download for your AI agents

Browse Skills
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What is The Prompt Index?

The Prompt Index is a free AI prompt database and tool suite. It holds 770+ curated prompts for ChatGPT, Claude and Gemini, 2,600+ agent skills (SKILL.md files), image prompts and custom GPTs, plus 25 AI tools for writing, research, decisions, images, audio and slides. It was founded by Stephen; read more about the site.

Popular guides: AI loop engineering and Gauntlet Loops · AI agent skills guide · What are LLM tokens? · GPT-5.6 and Claude Fable 5 prompting guide

Quick answers

What is a prompt database?
A searchable collection of ready-made prompts you can copy into an AI model. The Prompt Index database holds 770+ prompts for ChatGPT, Claude and Gemini, browsable by category and model.
How do I search for a prompt?
Use prompt search to find prompts by keyword across the whole library, or browse the database by category.
What is a SKILL.md file?
An agent skill: a Markdown file with YAML frontmatter that tells an AI agent how to do a task. The SKILL.md format guide explains the fields, and the skills library has 2,600+ to download.
Is The Prompt Index free?
Browsing the prompt, skill, image and GPT libraries is free and needs no account. The AI tools have Free, Basic and Pro plans with different usage limits (see plans).
Who runs it?
It was founded by Stephen; the about page has the details.
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