Fix this, anywhere. Select text in any app and press three keys. Prompty rewrites it right where it is.
CtrlAltF
Your next answer could be a lot better.
Free to start. No credit card needed.
Watch it work. Start to finish.
The bar at the top of your screen takes a short request, asks one question, writes the full prompt into your AI app, asks for a better version and frames the best answer.
Prompty is ready
Writing your prompt
How it works The loop it runs.
You do the first step. Prompty does the part most people skip: it asks what's missing, writes the prompt, sends it, then reads the answer and goes round again until it's good.
Watch the 1-minute video
-
Say what you want
Type it, or speak it on Plus and Pro. Messy is fine.
-
It asks what's missing
One or two short questions, only when something important is missing.
-
It writes and sends
In the style that AI likes, in a fresh chat in the app you already use.
-
It pushes back
It reads the answer, asks again when something's missing, and frames the best one.
Same request. A much better prompt.
Each AI likes to be asked differently. Claude works well with clearly tagged sections, ChatGPT with headings and numbered steps. Prompty knows the difference.
What you type
write a linkedin post about my new product
8 words. Prompty asks two questions: who it's for, and how long.
What Prompty sends
<role>You write LinkedIn posts for small founders.</role> <task>Announce Prompty, a desktop agent that writes better prompts for Claude and ChatGPT.</task> <audience>Founders who use AI every day but get average answers.</audience> <format>Under 150 words. A strong first line. Three short paragraphs. End with one question. No hashtags.</format>
## Role You write LinkedIn posts for small founders. ## Task Announce Prompty, a desktop agent that writes better prompts for Claude and ChatGPT. ## Audience Founders who use AI every day but get average answers. ## Format 1. Under 150 words, with a strong first line. 2. Three short paragraphs, ending with one question. 3. No hashtags.
Example for illustration. What you get back depends on the AI and on your request.
- ClaudeClear sections, each one tagged.
ChatGPTHeadings and numbered steps.
GrokPlain and direct, goal first.
PerplexityOne precise research question.
Why not just use ChatGPT?
ChatGPT answers the words you give it. Prompty makes those words worth answering, then checks the reply for you.
It runs inside the ChatGPT, Claude, Grok or Perplexity you already have, and each AI gets its own agent that knows how it likes to be asked. Free accounts work too.
Small details, done properly.
Compare two AIs. On Pro, one prompt goes to two AIs at once, and the better answer gets the frame.
Custom agents for jobs you repeat. Prompty remembers how you like each job done, and opens the app when the answer is ready.
Talk instead of typing. Voice in up to 18 languages on Plus and Pro, and Prompty can read its questions back to you.
A fresh chat every time. Prompty opens a new chat for each request, so old messages never leak into a new one.
Updates that ask first. Every update is signed by Lumly and checked before it installs. You choose when.
Dress up your agents. 29 hats and accessories. One in a hundred agents is born shiny, golden and sparkly.
Everything lives in one small bar.
Chat, history, your plan, the Cosmetics tab and your custom agents all open inside the bar. There's no window to manage.
What Prompty sees, and when.
Prompty uses your mouse and keyboard and reads your screen, so it's fair to ask exactly what it looks at.
- While it works for you
- Your AI app's window, and nothing else. Prompty takes screenshots of that one window while it works on your request, so it can read the answer.
- When you use Fix this
- Only the text you selected. Prompty gets that text and rewrites it.
- When you press Roast my screen
- One screenshot of your whole screen. It's sent once to write the roast and isn't saved.
- The rest of the time
- Nothing. Prompty doesn't watch your screen in the background.
- When does it use my mouse and keyboard?
- Only after you send a request, to open a new chat, paste the prompt and press Enter. A purple frame is on screen the whole time.
- Where do the screenshots go?
- Through Lumly's server to Anthropic's AI, which reads the answer. They aren't stored by Lumly. Your account and usage are stored with Supabase.
- Are updates safe?
- Every update is digitally signed by Lumly. Prompty checks the signature and the file's fingerprint before installing, and refuses anything that doesn't match.
- What does it save on my PC?
- Settings and history in
%APPDATA%\Prompty. - Can I remove it?
- Yes. Settings, then Apps, Installed apps, Prompty, Uninstall.
You'll probably see a Windows warning
Windows shows "Windows protected your PC" for new apps that aren't code-signed yet, which costs money and takes time for a small company. Click More info, check that it says Prompty-Setup-0.54.exe, then click Run anyway. Code signing is on our list.
Check the file yourself
This is the SHA-256 fingerprint of Prompty-Setup-0.54.exe. If yours matches, it's the exact file we published.
a42ed4c4db07d3a555f0c7f82431dbf1e92bd41272fdfc0e0b66e4894e3b65e8In Command Prompt: certutil -hashfile Prompty-Setup-0.54.exe SHA256, or look it up on VirusTotal.
Start free. Upgrade when it earns it.
- Free$0
Daily usage to get started. Improves the answer once. All four agents.
- Plus$14.99a month
5× the usage of Free. Improves the answer up to twice. Voice and 8 languages.
- Pro$39.99a month
15× the usage of Free. Up to 5 rounds of improving. Compare mode and 18 languages.
See every planYearly plans get 2 months free. Paid through PayPal, cancel any time.
“Most people don’t know how to write a good prompt, and it’s the difference between an average answer and a great one. So I built the thing that writes it for you.”
The first version of Prompty was a Python script in a black Command Prompt window. Lumly is just me for now, so if something breaks or you have an idea, you're writing straight to the person who builds it.
Jonathan, founder of Lumly, Tel Aviv
Your next answer could be a lot better.
Free to start. No credit card needed.
Download Prompty for Windows 10 and 11.
Install
- Open
Prompty-Setup-0.54.exefrom your Downloads folder. - If Windows says "Windows protected your PC", click More info, then Run anyway. Why this happens.
- Sign in or create your free account in the app.
- Open Claude, ChatGPT, Grok or Perplexity, then move your mouse to the top of the screen.
Uninstall
Open Settings, then Apps, Installed apps, Prompty, Uninstall. Your settings folder %APPDATA%\Prompty can be deleted after that.
- File
Prompty-Setup-0.54.exe- Version
- 0.54
- Released
- 16 October 2026
- Size
- 57.2 MB
- Needs
- Windows 10 or 11, and the Claude, ChatGPT, Grok or Perplexity desktop app, signed in
- Account
- Free Lumly account, made in the app
- Updates
- Prompty asks before updating
- SHA-256
a42ed4c4db07d3a555f0c7f82431dbf1e92bd41272fdfc0e0b66e4894e3b65e8
On a Mac?
The Mac version is in the works. Leave your email and you'll hear when it's ready.
Start free. Upgrade when it earns it.
Every plan includes all four agents and works with your free ChatGPT, Claude, Grok or Perplexity account. Paid plans give you more daily usage, more rounds of improving, voice and more languages.
Pay yearly and get 2 months free.
Free
Try Prompty on your everyday questions.
$0forever
No card, no trial clock.
- 1× daily usageResets every day. Paid plans are measured as a multiple of this.
- Improves the answer oncePrompty reads the first answer and pushes back once when something's missing.
- All four agents
- 1 custom agent
- English
- Basic accessories
- No voice
Plus
For people who use AI every day.
$14.99/ month
Billed monthly. Cancel any time.
- 5× Free daily usageFive times the daily usage of Free. How much one request uses depends on its length and how many rounds it takes.
- Improves the answer up to twiceUp to two rounds of reading the answer and asking again.
- All four agents
- 3 custom agentsAgents linked to apps like Gmail, each with its own face.
- Voice inputTalk to Prompty instead of typing.
- 8 languagesEnglish, Hebrew, Spanish, French, German, Arabic, Portuguese and Russian.
- More accessories
Pro
For heavy users and people who work with AI.
$39.99/ month
Billed monthly. Cancel any time.
- 15× Free daily usageFifteen times the daily usage of Free.
- Up to 5 rounds of improvingPrompty keeps pushing back, up to five rounds, until the answer is good.
- Compare modeSend to two AIs at once and get the better answer framed.
- 10 custom agentsAgents linked to apps like Gmail, each with its own face.
- Voice input
- 18 languagesThe 8 on Plus, plus Italian, Dutch, Turkish, Polish, Ukrainian, Chinese, Japanese, Korean, Hindi and Indonesian.
- All accessories
Prices in US dollars. Paid through PayPal, with your PayPal balance or a card. Refunds within 7 days of your first payment.
- All four agentsClaude, ChatGPT, Grok and Perplexity, on every plan.
- Your own AI accountWorks with free accounts. No extra AI subscription needed.
- Signed updatesPrompty checks every update's signature before it installs.
- Cancel any timeStop in PayPal whenever you like and keep your plan until the period ends.
How to upgrade It starts in the app.
-
Download Prompty
Install it and make your free account in the app.
-
Open Plan
In the bar, open Plan and click Upgrade on Plus or Pro.
-
Pay with PayPal
Your plan switches on within about a minute.
Upgrades start from the app so the payment always goes to the right account.
Plan questions
What happens when I hit my limit?
Prompty tells you in the bar and stops sending until your usage resets the next day. Your AI apps keep working as normal.
Why multiples and not exact numbers?
How much one request uses depends on how long it is and how many rounds it takes. "5× Free" is a fairer picture than a number that changes from request to request.
Do I need to pay for Claude or ChatGPT too?
No. Prompty works inside the app you already use, on whatever plan you have there, free or paid.
How do I pay?
Through PayPal. You can use your PayPal balance or pay with a card through PayPal without making an account.
Can I cancel any time?
Yes. In PayPal go to Settings → Payments → Automatic payments, pick Lumly and cancel. You keep your plan until the end of the period you paid for, then you're back on Free.
Can I switch from Plus to Pro?
Yes. Click Upgrade on Pro in the app. Your Plus subscription stops automatically, so you're never charged for both.
Can I get a refund?
Yes, within 7 days of your first payment for Plus or Pro. Email lumlysupport@gmail.com from your account's address. See the refund policy.
What's new in Prompty.
Every build of Prompty, newest first. Get the latest one on the download page.
0.54 16 Oct 2026 · latest
- Shiny agents: 1 in 100 agents is born shiny, golden and sparkly. If yours is, Prompty tells you right away.
- Roast my screen: open the menu and let your agent tease you about what is on your screen, with one real tip at the end.
0.53 13 Oct 2026
- Special hats: a Halloween drop with a Witch hat and a Pumpkin, free to claim until 2 November.
- Invite a friend with your code in the Cosmetics tab, and you both get the golden Laurel.
- Works in your browser too: choose Desktop app or Browser in Settings. Prompty always uses a new tab.
- Fix this: select text in any app and press Ctrl+Alt+F to turn it into a strong prompt, right where it is.
- Compare mode on Pro: send to two AIs at once and get the better answer framed.
- About you: tell Prompty a little about yourself so it asks fewer questions.
- Safety: app shortcuts were removed, and Prompty only ever opens secure (https) links.
0.52 10 Oct 2026
- Safety update. Prompty only ever types into your AI app, and stops if another window comes in front.
- Whatever you had copied is put back after Prompty pastes your prompt.
- Every update is now digitally signed by Lumly, and Prompty checks the signature before installing.
- Signing out clears your prompt history from the computer, and uninstalling removes all of Prompty's files.
- Voice is sent over an encrypted connection.
0.50 9 Oct 2026
- Big security update: stronger protection for your account and sign-in.
- Forgot your password? The reset link now opens a page where you choose a new one.
- You're signed out after 30 days without using Prompty, and signing out now ends your login everywhere it should.
- Updates only install from our official download page, and only after the file is checked.
0.49 9 Oct 2026
- The usage meter now matches your plan more closely.
- Upgrades are locked to your own account, so a payment can't land on someone else's.
0.47 9 Oct 2026
- Your sign-in is now encrypted on your computer, so other programs can't copy it.
- New passwords need at least 10 characters, with letters and a number.
- After several wrong passwords, Prompty makes you wait a bit before trying again.
0.46 9 Oct 2026
- Upgrade to Plus or Pro with PayPal, right from the Plan page. Monthly or yearly.
- Your plan switches on by itself after you pay. There's also a Refresh plan button.
- Manage or cancel your subscription from the Plan page.
- Prices now show on the plan cards.
0.45 8 Oct 2026
- The bar closes on its own when your mouse leaves it.
- Checks that a new chat really opened before sending.
- The best answer gets a frame, so it's easy to find.
- Tray icon and Start with Windows.
0.39 8 Oct 2026
- Clearer message when voice isn't available on a computer: it now tells you to update Prompty or contact us, instead of showing a technical command.
Help and answers.
Common questions
Is Prompty safe to install?
Yes. It's a normal Windows installer, and you can check the file's SHA-256 against the one on the download page. Windows may warn you because the app isn't code-signed yet. Here's what it does on your computer.
What can it see on my screen?
Only your AI app's window, and only while it's working on something you asked for. It takes screenshots of that window to read the answer. See the privacy policy.
Why does it control my mouse and keyboard?
To open a new chat, paste your prompt and press Enter, the same steps you'd do. The purple frame shows while it's doing that. Click the frame to stop.
Why a new chat every time?
Earlier messages in a chat change how the AI answers. A fresh chat keeps your request clean.
How do I uninstall it?
Settings → Apps → Installed apps → Prompty → Uninstall. To delete your account too, email us (below).
Something not working?
"Prompty couldn't open a new chat"
- Using the website in a browser? Make sure you're signed in there, and pick Browser under Settings, Where your AI runs.
- Close any pop-up or settings screen inside the AI app.
- Don't move the mouse while the purple frame is showing.
It can't find my AI app
- Pick the agent that matches the open app, for example ChatGPT for the ChatGPT app.
- Restore the app if it's minimised.
The agent doesn't show up at the top
- Check for the Prompty icon in the tray, next to the clock.
- Move the mouse slowly to the very top, near the middle. Or press Ctrl Alt P.
It read the answer wrong
- Make the AI app's window bigger so the whole answer fits.
- Very long answers can get cut off. Ask for a shorter one.
Contact and bug reports
Use the contact form, or email the address below. For a bug, include your Prompty version (Settings), which agent you used, what you asked for and what happened. A screenshot helps a lot.
lumlysupport@gmail.comGet in touch. Talk to a human.
Questions, bugs, billing or an idea for Prompty. Send it here, or email us directly.
Privacy policy
Last updated 31 October 2026
This explains what Prompty and lumlyai.com collect, why, who else handles it, and what you can ask us to do with it. We've tried to write it in plain words.
The short version
- We collect only what Prompty needs to work: your account, how much you use it, and the requests you make.
- Your requests and screenshots pass through our server to the AI and are not stored by us.
- Prompty only looks at your screen while it's working on something you asked for.
- We don't sell your data, show ads, or use tracking cookies.
- You can ask us to delete everything at any time.
Who we are
Prompty is made by Lumly, based in Tel Aviv, Israel. Lumly is run by Jonathan E. and is responsible for your data under this policy. Contact: lumlysupport@gmail.com.
What we collect
- Your account: your email address and, if you give it, your name. Your password is stored only as a scrambled "hash" by our account provider; nobody at Lumly can see it. If you sign in with Google, Google tells us your email and name. If you turn on 2-step verification, we keep that it's on.
- Your plan and payments: which plan you're on, your PayPal subscription number, its status and the dates it covers. PayPal handles the payment itself; we never see your card or bank details.
- Usage numbers: per day, how much AI you used (a cost figure, the number of requests and their size). This is how plan limits work.
- Your requests: what you type or say to Prompty, and the conversation it has with you about it. If you use Fix this, the text you selected and asked Prompty to rewrite.
- Roast my screen (only when you press it): one screenshot of your whole screen, sent to our AI server to write the roast. It is not saved; only the usage is counted.
- About you (optional): the few words you write about yourself in Settings, sent along with your requests so the prompts fit you.
- Screenshots of your AI app's window: taken only while Prompty is working on your request, so it can check the answer. Anything else visible inside that area of the screen at that moment (for example a notification) can be in the picture.
- Voice (Plus and Pro): only while you hold or click the microphone. The recording is turned into text by Google's speech service.
- Website sign-ups: if you join the launch list or Mac waitlist, your email address.
- Leaderboard: if you join the waitlist leaderboard, your email, the first name you choose (shown on the board), your invite code, who invited you, and a scrambled fingerprint of your internet connection (so one connection can't fake many sign-ups).
- Hats and invites: which special hats your account has, your invite code, and which account invited which (so both get the invite hat).
- Support emails and the contact form: whatever you write to us, and the name and email address you give.
- Technical records: our providers keep short-lived server logs (such as IP addresses and times) to keep the service running and safe.
How we use it
- To run Prompty: write your prompt, operate your AI app when you ask, and check the answer.
- To run your account and plan: sign-in, plan limits, payments and upgrades.
- To keep Prompty safe: stop abuse, fraud and attacks.
- To help you when you contact us, and to send the emails you signed up for.
If you're in the EU or UK, our legal reasons are: to provide the service you asked for (contract), to keep it safe and working (legitimate interests), to meet legal duties such as tax records, and your consent for the launch and waitlist emails (you can withdraw it any time).
The AI
Prompty's AI is provided by Anthropic. Your requests and screenshots go from the app, through our server, to Anthropic, and the answer comes back the same way. We don't keep a copy on our server. Anthropic says it automatically deletes this data within 30 days (longer only if something breaks its usage rules or the law requires it), and under its commercial terms it doesn't use it to train its models.
What stays on your computer
In %APPDATA%\Prompty: your settings, your Prompty history (your past requests, in plain text), usage totals, and your sign-in, which is encrypted with Windows so other programs can't read it. You can clear your history in the app, or delete the folder after uninstalling.
Who else handles your data
We use these services to run Prompty. Each only gets what it needs:
- Supabase: accounts, plans and usage numbers, and our server.
- Anthropic: the AI (requests and screenshots).
- Google: voice-to-text, and Google sign-in if you choose it.
- PayPal: payments and subscriptions.
- Netlify: this website, its sign-up forms and the contact form.
- GitHub: hosts the download and update files.
- Gmail: our support inbox.
The news headlines and market prices shown in the app are fetched from public sites (such as TechCrunch, MIT Technology Review and Yahoo Finance). Like any website, they see your internet address when the app loads them; they don't get anything else from Prompty.
We share data with others only if the law requires it, to protect people from harm, or as part of a sale of the business (in which case this policy keeps applying). We never sell it.
Where it's stored
Our providers store data on servers outside Israel, mainly in the United States and Europe. They're required to protect it with security measures and contracts appropriate to the law.
How long we keep it
- Account, plan and usage: while your account exists. Deleted within 30 days after you ask us to delete your account.
- Requests and screenshots: not kept by us. Anthropic deletes them within 30 days, as described above.
- Payment records: up to 7 years, because tax law requires it.
- Website sign-up emails: until we've sent the email you signed up for, or until you ask to be removed.
- Support emails: up to 2 years.
- Server logs: a few days to a few weeks, depending on the provider.
How we protect it
Everything travels encrypted (HTTPS). Each account can only read its own data, all changes go through our server, our secret keys never leave the server, and you can turn on 2-step verification. No system is perfect; if something goes wrong that affects your data, we'll tell you and the authorities as the law requires.
Your rights
You can ask to see the data we have about you, correct it, delete it, get a copy, or object to how we use it. Email lumlysupport@gmail.com from your account's address and we'll answer within 30 days. You can also complain to Israel's Privacy Protection Authority, or to the data protection authority where you live.
Age
Prompty is for people 18 and over. We don't knowingly collect data from anyone younger; if you think we have, tell us and we'll delete it.
Cookies
This website doesn't use cookies, analytics or ads. The preview code is remembered only in your browser for the current visit. The upgrade page loads PayPal's checkout, which may use its own cookies under PayPal's privacy policy.
Changes
If we change this policy in a way that matters, we'll update the date above and tell account holders by email or in the app before it applies.
Terms of service
Last updated 9 October 2026
These terms are the agreement between you and Lumly (run by Jonathan E., Tel Aviv, Israel) for using the Prompty app and lumlyai.com. By creating an account or using Prompty, you agree to them. Our privacy policy and refund policy are part of them.
1. Who can use Prompty
- You must be 18 or older.
- You need a Lumly account. Give a real email address, keep your password private, and tell us if you think someone else is using your account. You're responsible for what happens in your account.
- One person per account. Don't share or sell access.
2. What Prompty does
Prompty helps you write prompts and, when you ask, operates the Claude, ChatGPT, Grok or Perplexity desktop app on your computer: it opens a chat, types and sends your prompt, takes screenshots of that app's window to read the answer, and may send follow-up messages. While it's working it controls your mouse and keyboard, so let it finish before using your computer, and keep private things out of that window.
AI answers can be wrong, incomplete or out of date. Check anything important before you rely on it, especially medical, legal, financial or safety matters.
3. Your AI apps
You need your own accounts with the AI apps you use, and you must follow their terms. Messages Prompty sends in those apps count as yours. Prompty is an independent product. It isn't made, endorsed or sponsored by Anthropic, OpenAI, xAI or Perplexity. Claude, ChatGPT, Grok and Perplexity are trademarks of their owners.
4. Plans and limits
The Free plan costs nothing. Plus and Pro give you more usage (shown as a multiple of Free) and more features, as described on the pricing page. Usage limits reset daily at midnight UTC. We may change the Free plan at any time. We won't reduce what a paid plan includes during a period you've already paid for.
5. Payments
- Plus costs $14.99 a month or $149.90 a year. Pro costs $39.99 a month or $399.90 a year. Prices are in US dollars and paid through PayPal.
- Paid plans renew automatically at the end of each period until you cancel.
- Your plan starts once PayPal confirms the payment.
- Moving from Plus to Pro starts a new subscription and stops the old one.
- You can cancel any time in PayPal → Settings → Payments → Automatic payments. You keep your plan until the end of the period you paid for.
- If a payment fails and isn't fixed, your account moves to Free.
- If we change prices, we'll email you at least 30 days before the change affects your renewal, so you can cancel first.
6. Refunds
See the refund policy.
7. Things you must not do
- Use Prompty for anything illegal, harmful, abusive, or that breaks Anthropic's usage policy or the AI apps' rules.
- Try to get around plan limits, payments, or security; probe, attack or overload our servers; or use someone else's account.
- Copy, resell, or reverse-engineer Prompty or its servers, except where the law lets you.
- Use Prompty to build a competing product, or to collect other people's data without permission.
8. Your content
What you type, say and get back stays yours. You let us process it only to run Prompty for you, as the privacy policy explains. You're responsible for what you ask for and how you use the answers, and for having the right to anything you put into Prompty.
9. Our app
Prompty, its design, characters and name belong to Lumly. You get a personal, non-transferable right to install and use it on your own computers while these terms apply. We release updates to fix problems and improve Prompty; the app asks before installing them. Features may change or be removed over time.
10. Ending
You can stop using Prompty and ask us to delete your account at any time. We may suspend or close an account that breaks these terms or puts others at risk; if that happens without a serious reason, we'll refund the unused part of a paid period. If we ever shut Prompty down, we'll give at least 30 days' notice and refund unused paid time.
11. No guarantees
We work hard to keep Prompty running well, but it's provided "as is". We can't promise it will always be available, error-free, or work with every version of the AI apps, which can change without notice.
12. Limits on our responsibility
As far as the law allows, Lumly isn't liable for indirect or follow-on losses (such as lost profits or data), or for what the AI apps or AI answers do. Our total responsibility for any claim is limited to what you paid us in the 12 months before it, or $50 if that's more. Nothing here limits anything the law doesn't allow to be limited, such as liability for fraud or your rights as a consumer.
13. Law and disputes
These terms are governed by the laws of Israel, and the courts of Tel Aviv-Yafo have jurisdiction. If you're a consumer living elsewhere, you keep the protections of your own country's law and can use your local courts. Please contact us first; most things can be sorted out by email.
14. Changes to these terms
If we make important changes, we'll tell account holders by email or in the app at least 30 days before they apply. If you don't agree, you can cancel before then.
15. Contact
Refund policy
Last updated 9 October 2026
Plus and Pro are paid through PayPal, monthly or yearly. The Free plan costs nothing.
First payment
If you ask within 7 days of your first payment for Plus or Pro, you get a full refund, no questions asked.
Renewals
Renewal payments aren't refunded, but you can cancel any time and keep your plan until the end of the period you paid for. To avoid a renewal, cancel before the renewal date in PayPal → Settings → Payments → Automatic payments.
When something goes wrong on our side
If you were charged by mistake, charged twice, or Prompty didn't work for you because of a problem on our side that we couldn't fix, we'll refund you.
Your legal rights
If the law where you live gives you a longer or wider right to cancel (for example, the right to cancel an online purchase within 14 days under Israel's Consumer Protection Law), you get that right, and this policy doesn't reduce it.
How to ask
Email lumlysupport@gmail.com from your account's address with the PayPal receipt or the date of the payment. Refunds go back to the way you paid, usually within 14 days.