I've been running a solo business and got obsessive about finding prompts that actually save time vs. ones that just sound good in a tweet.
After testing 200+, here are the 5 I'd keep if I could only keep 5:
1. The Ruthless Editor "Rewrite this to be 40% shorter without losing any meaning. Cut filler, redundancy, and hedging. Show me only the final version."
The specific percentage matters — vague instructions return vague output.
2. The Devil's Advocate "You are a highly skeptical critic of the following plan. List every way this could fail, every assumption I'm making, and every risk I'm ignoring. Be brutally honest."
Run every major decision through this before committing.
3. Plain English Explainer "Explain [topic] like I'm a smart professional who has never worked in this field. Use one concrete analogy. Keep it under 150 words."
If AI can't explain it simply, your pitch can't either.
4. Ideal Customer (the version that works) "Based on this product, tell me: (1) The biggest fear my ideal customer has that they'd never admit publicly. (2) The exact language they use describing this problem to themselves. (3) What they've tried that didn't work, and why they believe it failed."
This changed how I write every sales page.
5. Cold Email That Gets Replies "Rewrite this cold email: open with their problem, one ask under 10 words, under 100 words total, zero corporate jargon."
Reply rates matter more than open rates.
These 5 are from a library of 47 I've built testing what actually produces ROI. What prompts have genuinely changed YOUR workflow?
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