Go to aistudio.google.com with a personal Gmail account and choose Build.
Copy the 'Quote calculator app' prompt below, fill in the business and its three options, and paste it in. AI Studio writes the app and can set up the enquiry storage and Google sign-in for you.
Use the preview like a visitor: pick an option, check the price range, leave a test enquiry. Then open the admin page and check the enquiry is there.
Use annotation mode: highlight the part of the preview you want changed and describe the change, instead of explaining where it is.
Click Publish, then Get Started, then Publish App. Type a name in the Custom URL field to get your own address ending in ai.studio.
Open the live address on your phone, send a test enquiry and check it arrives on the admin page.
Swap the service details for a local cleaner, tutor or photographer and show them the working demo. Use the 'Short pitch' prompt to write your message.
If you need more than two apps or more capacity, AI Studio lets you add a Google Cloud billing account. Check the pricing first.
Build a mobile-first quote calculator for my [service, e.g. home cleaning] business called [business name] in [town]. Visitors pick from these options: [option 1: e.g. 1-2 bedroom], [option 2], [option 3], plus [one extra, e.g. deep clean yes/no]. Show an instant price range in [currency] using these ranges: [ranges]. Then ask for their name, email or phone, and project details to get an exact quote. Show a thank-you message. Save every enquiry in Firestore with the date and the options picked. Add an admin page behind Sign in with Google that only [my email] can open, listing enquiries newest first. Clean design, one accent colour [colour], no stock photos. Add a line under the price: 'Estimate only. We'll confirm your exact price.'💬 Short pitch (optional)
Write a short, friendly message (under 90 words) to [business owner's first name], who runs [business] in [town]. Say I built a free working demo of an online quote calculator for their kind of business, give the link [demo link], and say it saves every enquiry to a private page. Offer to set it up with their real prices for [my price, e.g. a one-off fee]. No hype, no made-up results.
From https://usecasy.com/use-case/gemini-free-quote-calculator-app/ · Guide checked 22 October 2026 · Prices are rough and shown in USD unless stated (MYR where relevant).