Chrome extension

Your AI copilot.Before you hit send.

PromptShield turns rough ideas into clearer, more effective prompts—right inside the AI chats you already use. No prompt engineering required.

Works with the AI chats you already use

  • ChatGPT
  • Claude
  • Gemini
  • Perplexity
  • Grok
  • DeepSeek
  • Meta AI

Free to startNo credit card3 free optimizations every day.

Example on ChatGPT — one of seven supported AI chats

ChatGPT

You type

“Explain calculus derivatives for my exam.”

PromptShield
Optimized in one click

Could you provide a comprehensive explanation of calculus derivatives, including their definition, significance in understanding rates of change, and how they are applied in various mathematical contexts? Additionally, please include examples of common derivative rules, such as the power rule, product rule, and quotient rule, along with visual aids or graphs that illustrate the concept. It would also be helpful to discuss the relationship between derivatives and real-world applications, such as in physics or economics, to enhance understanding for exam preparation.

2 optimizations remaining today

Use this versionKeep mine

Real optimizer result. Unedited.

AI should save you work.Not give you more.

Stop spending time explaining every detail. Type your idea, and PromptShield turns it into a detailed prompt for you.

You type

“Help me start a business”

  • Business idea
  • Market research
  • Business plan
  • Funding
  • Legal requirements
  • Marketing and growth
PromptShield
Real result · unedited

Please provide a comprehensive guide on how to start a business, covering essential steps such as identifying a viable business idea, conducting market research, creating a business plan, securing funding, and understanding legal requirements. Additionally, include considerations for different types of businesses, potential challenges, and strategies for marketing and growth, as well as resources for ongoing support and networking opportunities.

You could save ~1m 50s of writing time (est.).

2 optimizations remaining today

Your first sentence is enough to start.

Studying, research, and business. Unchanged.

PromptShieldUnedited

Could you provide a comprehensive explanation of calculus derivatives, including their definition, significance in understanding rates of change, and how they are applied in various mathematical contexts? Additionally, please include examples of common derivative rules, such as the power rule, product rule, and quotient rule, along with visual aids or graphs that illustrate the concept. It would also be helpful to discuss the relationship between derivatives and real-world applications, such as in physics or economics, to enhance understanding for exam preparation.

You could save ~2m 10s of writing time (est.).

What PromptShield improved

  • Include definitions and significance
  • Provide examples of derivative rules
  • Discuss real-world applications
  • Incorporate visual aids or graphs

Leave the chat open.Finish the request.

Press the mark. Read the full prompt. Use it, or keep yours.

ChatGPTBefore you send

You type

“Help me start a business”

In ChatGPT, Conversation Context is optional and off until you turn it on. It can use up to six recent messages from this chat. It is not stored.

Conversation Context

“Make it simpler” should be enough.

On ChatGPT, a short follow-up can still mean the message above it.

Optional, and off until you turn it on. ChatGPT only. Up to six recent messages from the current chat. It is not stored, and it does not read your other chats.

Illustration. Not an optimizer result.

Earlier in this chat

Explain photosynthesis for a 10-year-old.

Included from this chat.

“make it simpler”

The short follow-up can refer to the message above it.

Your ideas don't stop at three.Why should PromptShield?

From studying to research to your next big idea, PromptShield helps you turn quick thoughts into detailed AI prompts. And when you need more, Pro keeps up.

Free includes 3 successful optimizations a day.

  1. Studying

    “Explain calculus derivatives for my exam.”

  2. Research

    “Help me research sleep deprivation and cognition and produce a literature review outline.”

  3. Business

    “Help me start a business”

You could save ~6m 20s of writing time (est.). Across these three prompts. It is not an average, and not how long PromptShield takes. Not measured elapsed time.

The next prompt

“Help me draft the follow-up email.”

Illustration. Not an optimizer result.

Free

Daily limit reached. Come back tomorrow.

Pro

Keep going. No daily limit.

Three a day is a trial.Unlimited is a workflow.

Your ideas don't stop at three. Neither should your workflow.

  • The practice set still isn't finished.
  • The next source needs its own prompt.
  • The email still has to go out.

Free

$0

3 successful optimizations a day.

Optimize a prompt now →

Use PromptShield right here — no extension needed.

Pro

$2.99

for your first month

Then $7.99/month. Cancel anytime.

No daily limit.

The prompts stay the same. Pro removes the daily cap.

Add to Chrome, then upgrade

Free and Pro use the same optimizer.

Then open Settings → Account in the extension. This page does not start checkout.

Compare plansPrivacySecurity

You think it.PromptShield puts it into words.

  • ChatGPT
  • Claude
  • Gemini
  • Perplexity
  • Grok
  • DeepSeek
  • Meta AI

FAQ

A few things people ask first

PromptShield is a Chrome extension that reviews the prompt you are writing in a supported AI chat, suggests a clearer version with more useful context, and lets you apply it with Use this version before you send. Apply replaces the draft and does not send it.

Yes. Add to Chrome — Free includes 3 successful prompt optimizations per local day. No credit card is required for Free. Usage resets at local midnight.

Works with ChatGPT, Claude, Gemini, Perplexity, Grok, DeepSeek, and Meta AI in Chrome. It does not support Microsoft Copilot, mobile apps, or Meta AI inside Facebook, Instagram, Messenger, or WhatsApp. First-run onboarding currently opens ChatGPT; the extension still works on the other supported chats after install.

Cloud optimization requires a signed-in PromptShield account and sends the prompt you ask us to review to our API over HTTPS. Library, History, and personalization stay on your device by default. Image text can be checked on your device with local OCR when Guard is enabled. Payments run through Stripe. See Privacy and Security for details.

PromptShield estimates how long the extra text in an optimized prompt might take to write. It assumes a drafting speed of 40 words per minute and a review speed of 250 words per minute, rounds to the nearest 10 seconds, and does not add thinking time. The line says you could save that writing time until you choose Use this version. It is not how long PromptShield takes. It describes that prompt, not a typical day.

New Pro subscriptions are $2.99 for the first month, then $7.99/month. Cancel anytime. That is unlimited successful optimizations while the subscription is active. Free and Pro use the same optimizer. Upgrade from Settings → Account inside the extension — this site does not start checkout.