HackTheSim — Free, Field‑Tested AI Prompt Library (No Login)

Prompt engineering reference for creators, coders, and teams using AI daily. Curated templates that actually ship. No fluff, no paywall—just field‑tested prompts you can copy.

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What is HackTheSim?

HackTheSim is your no‑nonsense prompt library. Every template is built with our CORE recipe so you can reuse it in real work without hand‑holding.

  • Context — the facts and inputs the model needs
  • Outcome — the single, measurable goal
  • Rules — tone, format, constraints, length
  • Examples — patterns the model can mirror

Prompt of the Day

Prompt of the Day

Late Fee Waiver Request

Compose a polite email requesting a waiver of a late fee from [Service Provider] for a payment due on [Due Date]. Explain reason for delay (e.g. banking error, family emergency), include account number [Account Number], and request a one-time courtesy waiver.

Read full prompt →

Why creators use HackTheSim

✅ Curated & field‑tested
Only prompts that perform consistently in real projects make the cut.
⚡ Copy → Ship faster
Grab the exact pattern and paste it into your workflow.
đŸ§© Works with your stack
Fits ChatGPT, Claude, Gemini, Llama, and most RAG setups.
🧠 “Why it works” notes
Understand the levers so you can adapt the template with confidence.

Categories

✍
Text Generation
Blog posts, ads, summaries, rewriting, emails and more.
đŸ’»
Code & Scripting
Python, shell, debugging, tests, reviews.
🎹
Image Creation
DALL·E, Midjourney, SD—styles, lenses, lighting.
⚙
Workflow Automation
Notion, Zapier, agents, multi‑step flows.

Prompt Engineering – Practical vs Advanced

Common approachPrompt engineering
“Write me a blog post”Specify role, style, structure and context
“Draw a cat”Add style tags, camera, colour, composition
Generic requestsUse templates tailored for each use case
Disappointed by weak outputRefine with clear constraints and examples
Guess and hope for good resultsTest, analyse and improve the prompt

🔁 Sales Email Rewrite for Cold Outreach

📋 Instruction:

Rewrite the sales email below to make it more engaging, personalised and focused on value. Limit to 90 words. Use a friendly, confident tone. Include a clear benefit and a call to action. Audience: Small business owners in retail using spreadsheets for inventory. Product: StockFlow (cloud inventory management SaaS).

📹 Original Email:

Hi, I’m reaching out to see if you’re interested in trying our inventory software. It can help you track products and save time. Let me know if you want to try a demo.

🎯 Full Prompt:

Rewrite this email to small retail business owners still using spreadsheets for stock management.
Product: StockFlow (cloud based inventory SaaS).
Make it conversational, highlight a specific pain point, include a clear benefit and end with a low pressure call to action for a demo. Keep it under 90 words. Include a subject line.

✅ Example Output:

Subject: Tired of Spreadsheet Stock Chaos?
Hi [Name],
Managing inventory in spreadsheets is frustrating – errors, missed reorders and wasted hours are all too common. StockFlow is built for retailers like you: track products, automate reorders and get real-time updates – all in one place.

Want to see how it could save you hours each week? Let’s book a quick, no-pressure demo.

– Sam from StockFlow

Why it works:
â€ș Speaks directly to a pain point (spreadsheet frustration).
â€ș Highlights a core benefit and specific automation.
â€ș Uses a clear, non‑pushy call to action and a credible sender.

How HackTheSim works

  1. Browse or search – filter by model, use case or topic.
  2. Copy, adjust or combine prompt templates.
  3. Iterate with “why it works” notes for better output.
  4. Share yours to help others (and get featured).

Popular paths: Explore the Prompt Hub · Beginner’s Guide · Submit a Prompt · Saved Prompts

FAQs

Is HackTheSim really free?
Yes. Browse everything without an account. Create one if you want to save, upvote, and comment.

Can I submit my own prompts?
Absolutely. Head to Submit Prompt and we’ll review quickly.

What kinds of prompts are included?
Writing, code, images, automation, research, debugging, and more—each with clear constraints and patterns.

Do you provide examples and formatting?
Where useful, we include example inputs/outputs and copy‑ready formatting.

How do I get better results?
Use the CORE recipe (Context, Outcome, Rules, Examples) and the “Why it works” notes to tighten each pass.

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