Free
Spec Linter Lite
Drop a spec → see exactly what an AI would do with it. 3-layer validator: format, autotest, rubric.
Lint a specBack to all simulators
Simulator
Promt Enhancer Lite
Free
Paste any prompt — get the upgraded version with 5 best-practice rules applied.
Free · 12 runs/hour · no email needed
The problem this solves
You type 'write me a tweet' and get a fortune cookie. So you add a sentence, run it again, add another, run it again — four tries deep across three chat tabs and it's still generic. The model isn't broken. Your prompt is starving: no audience, no format, no constraints, no example. You feel it's wrong but you can't name the missing piece, so you keep gambling.
After completing this
You stop gambling and start diagnosing. Paste a weak prompt and the before/after shows you, in one glance, exactly which of the five rules was missing — and what the fixed version looks like. After a few rounds you write the upgraded prompt the first time, because you've seen the diff enough that the rules became reflex.
How it works
It's a simulator, not an article
You don't read about the five rules — you paste your own real prompt and immediately see what's wrong with it and how to fix it.
You answer first, theory after
You see the upgraded version and the diff first. The explanation of which rule kicked in comes after — which is why it sticks.
From the demo, a direct bridge to the paid track
Once prompts click, you move to whole specs in Spec Linter Lite, then into the paid 'Agent for Human' track where prompts become a working colleague.
Who this is for
Solo operators living in three chat tabs
Stop re-rolling the same ask. Paste once, get the upgraded prompt with format, audience, and constraints made explicit — and skip the next four tries.
PMs writing their first system prompt
Ship a prompt your bot won't embarrass you with. The diff doubles as documentation you can hand to a teammate without a Slack thread.
Engineers who can code but resent writing prose for the model
Treat the prompt like an API contract. You'll see the missing parameters spelled out instead of guessing at why the output drifts.
Not for you if
- People who want a 40-page prompt-engineering theory dump — this shows you the upgraded version, not a lecture.
- Anyone expecting a magic button that fixes a prompt with no intent behind it; garbage in still upgrades to structured garbage.
- Teams who already lint every prompt against a house style — you've internalized this already.
When you'll reach for this
01
You wrote 'write me a tweet' and got a Hallmark card
Drop the prompt in — get back the same intent with format, audience, voice, and constraints made explicit. No theory, just the upgraded version.
02
You're handing a prompt to a teammate and dread the questions
The before/after view doubles as documentation. Ship the upgraded one and skip the Slack thread about why it has five sections.
03
You keep tuning the same prompt across Claude, GPT, and Gemini
The upgrade applies model-agnostic structure so the same payload behaves the same way across providers — or fails loudly on the one that can't.
Powers you walk away with
- Diagnose a weak prompt in one glance — missing context vs. missing format
- Rewrite a vague ask into a testable one without leaving the page
- Read the diff and learn the rules by osmosis, not by reading a 40-page guide
- Hand the upgraded prompt to a junior and skip the explanation
What's inside
- 01Specificity, context, output format, constraints, examples — applied automatically
- 02Side-by-side before/after view
- 03Works with Claude, GPT, Gemini system prompts
Built on the same five rules every spec on FolderAI gets linted against.
What stays in your portfolio
- A reusable mental checklist: specificity, context, output format, constraints, examples.
- The ability to diagnose a weak prompt in one glance — missing context vs. missing format.
- A library of your own before/after diffs you can show a junior instead of explaining.
- Prompts that behave the same across Claude, GPT, and Gemini — or fail loudly on the one that can't.
Pairs well with
$19
Agent for Human
7-day course: hire your AI. From SOUL.md to a real working colleague — with daily exercises auto-graded by FolderAI.
Try Lite free
FAQ
Is it free?
Yes, fully. Paste as many prompts as you want — no card, no signup.
Do I need a card?
No. Open it, paste a prompt, get the upgraded version. There's no payment form anywhere.
How long does it take?
One pass is seconds. To turn the five rules into reflex, 10-15 minutes on your own real prompts is enough.
What's next after the demo?
Once you upgrade prompts on autopilot, there's a direct bridge to Spec Linter Lite — same discipline applied to whole specs — and on into the paid 'Agent for Human' track.
Does it work with Claude, GPT, and Gemini?
Yes. The upgrade is model-agnostic structure, so the same prompt behaves the same across providers — or fails loudly on the one that can't.
Made by mihalkevich.com — runs on the FolderAIThe engine that powers the courses and simulators engine.