Chrome extension

Stop rewriting prompts. Get better AI answers.

Use PromptShield instantly here, or add it to Chrome on your computer.

Example on ChatGPT — one of seven supported AI chats

ChatGPT

You type

“help me study for my calculus exam”

PromptShield
Optimized in one click

Act as a calculus tutor helping me prepare for my upcoming exam. I am comfortable with algebra but still new to limits and derivatives, and I need to actually understand the ideas — not just memorize formulas. Start by identifying the core concepts I should be solid on: limits, derivatives, and applications of derivatives. For each topic: 1. Explain the concept in simple language first, then give one everyday analogy. 2. Show a worked example step-by-step without skipping algebra. 3. After each explanation, give me one similar problem to solve myself and wait for my answer before revealing the solution. If I make a mistake, identify exactly where my reasoning went wrong rather than simply giving me the answer. Gradually increase the difficulty as I improve. End each topic with a 30-second “what this is really doing” recap I can remember under exam pressure. Prefer intuition before formulas. Ask me one diagnostic question first so you can start at the right level.

2 optimizations remaining today

Use this versionKeep mine

Write normally. PromptShield does the prompt engineering.

Optimize a prompt now →

Use PromptShield right here — no extension needed.

  • Free to start
  • No credit card
  • Apply without sending

Works with ChatGPT, Claude, Gemini, Perplexity, Grok, DeepSeek, and Meta AI.

3 free optimizations every day.

  • Works across 7 AI chats
  • One-click optimization
  • Free to start
  • Keep your original anytime

You type normally. PromptShield does the prompt engineering.

One click turns a rough request into a detailed instruction you would not usually write yourself.

You type normally. PromptShield does the prompt engineering.

You type

“explain photosynthesis”

PromptShield
Optimized in one click

Explain photosynthesis to a high-school student who remembers that plants need sunlight but cannot yet describe the process. Start with the core idea in two sentences: plants convert light into chemical energy. Then walk through the process in four clear steps from sunlight hitting the leaf to glucose being stored. Use one everyday analogy (for example, a kitchen that takes ingredients and produces a meal). Define chlorophyll, carbon dioxide, water, glucose, and oxygen in plain language the first time each appears. After the explanation, give me a simple labeled diagram description I could sketch, then 3 check-for-understanding questions of increasing difficulty. If I answer, tell me what I got right before correcting anything I missed. Do not assume AP Biology vocabulary unless I use it first.

2 optimizations remaining today

Use this versionKeep mine

More than optimization

Smarter prompts

Optimization, Quick Check, and Use this version. Keep yours whenever you want.

Safer prompts

When Guard is enabled, PromptShield can surface potentially sensitive information in the text you are about to send. Image text can be checked on your device with local OCR. Guard does not claim to catch everything.

Your workflow

Library and History stay on your device by default. Personalization learns from your choices locally. Coach can help with display language where that setting is available.

Built to be straightforward about your data

  • Chrome extension for seven verified AI chats
  • Free does not require a credit card
  • Stripe handles payments — we never store your full card number
  • Library and History stay on your device by default
  • Image text can be checked on your device with local OCR
  • Optimization is cloud-based and requires sign-in
Privacy PolicySecurity overview

Free vs Pro

Start with Add to Chrome — Free. Pro is optional and billed inside the extension.

Pro removes the daily limit. It does not unlock a different optimizer.

Free

START HERE

$0

Full optimizer quality

  • 3 successful optimizations per day
  • Full optimizer quality — same as Pro
  • Prompt Library & Optimization History
  • Review, Guard, Coach, and Personalization
Optimize a prompt now →

Use PromptShield right here — no extension needed.

Pro

$7.99 / month

Unlimited optimizations · same optimizer

  • Unlimited successful prompt optimizations
  • Same optimizer as Free — no quality tier
  • Recover Pro access across devices via your account
  • Manage and cancel through Stripe
Optimize a prompt now →

Use PromptShield right here — no extension needed.

Upgrade to Pro in Settings → Account inside the extension ($7.99/month).

Pro is $7.99/month · Compare plans

Your next prompt can be better.

Add PromptShield to Chrome and improve your next prompt in one click.

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.

Pro is $7.99/month for unlimited successful optimizations. Free and Pro use the same optimizer. Upgrade from Settings → Account inside the extension — this site does not start checkout.