Build AI-ready prompts
from messy ideas
PromptEngine is an AI prompt generator and optimizer for ChatGPT, Claude, Gemini and Grok. Your request gets understood, structured and rewritten into a clear objective, constraints and output format — so every model performs better.
A prompt system that thinks like a pro
From vague requests to structured, AI-native instructions—without the prompt engineering headache.
Intent structuring
Turns your message into a clear objective, context, constraints, and output format.
- Detects your real objective (write, code, fix, summarize, plan, …)
- Separates context from constraints automatically
- Picks the right output format for the task
Model alignment
Adapts tone, syntax, and structure for the specific AI you're going to paste into.
- Execution-first prompts for ChatGPT
- XML-block structure for Claude
- Deterministic formatting for Gemini & direct style for Grok
Quality guardrails
Adds practical constraints to reduce hallucinations and improve consistency.
- "Never fabricate; acknowledge uncertainty" baked into every prompt
- Locks output to clear headings, bullets, or schema
- Explicit reasoning + verification steps for hard tasks
How it works
A simple workflow designed for speed, clarity, and repeatability.
Even a short sentence is enough. Add context if you have it.
- No prompt-engineering knowledge required
- Works in English, Turkish, and more
Pick the model you'll actually paste into. PromptEngine tunes the output to its quirks.
- The four flagship conversational AIs
- Each gets its own prompt format and tone
Get a structured prompt and paste it into your AI tool instantly.
## Objective Author a clear, well-organized marketing email for our spring launch. ## Instructions - Hook + value prop in 2 lines - 3 short benefit bullets - Single clear CTA
- One-click copy, ready to paste
- Saved to your prompt history (Pro & Creator)
PromptEngine, right inside ChatGPT
Turn rough drafts into model-ready prompts without leaving ChatGPT, Gemini, or Claude.
Type your idea
Just start writing in ChatGPT — no prompt skills needed. Click the PromptEngine button to refine instantly.
PromptEngine refines it instantly
One click rewrites your draft into a structured, model-aligned prompt with intent, persona, and constraints.
The AI delivers a polished result
Get a precise, professional response — formatted clearly with tables, milestones, and actionable structure.
- Works on ChatGPT, Gemini, and Claude
- Same credits as the web app
- Free to install, no setup required
Sign in required after install. Free plan includes 3 prompts / week.
Plans for every level of prompt-craft
Start free. Upgrade when you need more prompts and full prompt history.
- • 3 prompts per week
- • ChatGPT, Claude, Gemini & Grok support
- • Chrome extension included
- • No prompt history
- • 50 prompts per week
- • ChatGPT, Claude, Gemini & Grok support
- • Chrome extension included
- • Full prompt history (pin, reopen, rename)
- • Unlimited prompts per week
- • ChatGPT, Claude, Gemini & Grok support
- • Chrome extension included
- • Full prompt history (pin, reopen, rename)
Frequently asked questions
Everything you need to know about the prompt generator, the four supported AIs, and the Chrome extension.
What is PromptEngine?
PromptEngine is an AI prompt generator and optimizer that turns rough ideas into structured, model-tuned prompts for ChatGPT, Claude, Gemini and Grok. It works as a web app and as a Chrome extension that runs inside the chat UIs of ChatGPT, Gemini and Claude.
Which AI models does PromptEngine support?
PromptEngine generates prompts tuned for four flagship conversational AIs: ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google) and Grok (xAI). Each model gets its own prompt structure and tone — Claude prompts use XML blocks, ChatGPT prompts are execution-first, Gemini prompts emphasise deterministic formatting, and Grok prompts use a direct conversational style.
Is PromptEngine free?
Yes. The Free plan includes 3 prompts per week with access to all four target AIs and the Chrome extension. Pro ($9.99 / month) raises the limit to 50 prompts per week and adds full prompt history. Creator ($19.99 / month) is unlimited. Both paid plans can be billed annually for a discount.
How is PromptEngine different from writing prompts by hand?
PromptEngine analyses your raw input, infers your real objective, picks the right output format and rewrites your request with explicit constraints — "never fabricate", "acknowledge uncertainty", structured headings. The result is a model-tuned prompt that gives sharper, more consistent answers than ad-hoc prompting, with none of the trial-and-error.
Does PromptEngine work inside ChatGPT?
Yes. The PromptEngine Chrome extension adds a one-click button right inside the ChatGPT, Gemini and Claude chat boxes. Type a rough draft, click the button, and your prompt is rewritten in place — no copy-pasting back and forth between tabs.
Can I cancel my subscription anytime?
Yes. Pro and Creator subscriptions can be cancelled anytime from your account. There are no long-term contracts, and your account stays on the Free plan after cancellation.
Where does PromptEngine store my prompts?
Prompts are not logged on our servers. Semantic processing happens in your browser. Pro and Creator users can opt to save prompts to their personal prompt history; Free users have no history by design. We do not run third-party advertising and we do not sell your data.
Ready to generate your first pro prompt?
Click once and start from a clean, structured base.