Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
Someone hands you a business card
$9.99 · In-app purchases
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Your first Build Kit is free with a verified email.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Someone hands you a business card. Weeks later, you need to reach that person. Fonym keeps the cards you collect and lets you search them when that moment comes — and it works without Internet: everything happens on your phone. WHO IT IS FOR Built for people whose pockets fill up with business cards, who cannot afford to lose one, and who need to reach a contact wherever they happen to be — without a drawer full of paper. Electricians, plumbers, HVAC and contractors. Mechanics, body shops and dealers. Hairdressers, cleaners and home services. Real estate agents, brokers, caterers and event vendors. Executive and personal assistants, office and facilities managers, procurement, receptionists and practice managers. Anyone attending or working a conference or trade show. And anyone running a household who is tired of scrolling past four hundred friends to find the electrician. PAY ONCE. NOTHING LEAVES YOUR PHONE. WORKS WITH NO SIGNAL. You pay once. No subscription, no ads, no account, no in-app purchases, and no feature waiting behind a second payment. What you install is the complete app, with no cap on how many contacts you keep — and the features you bought will never move behind a new paywall later. There is no Fonym account and no Fonym server. Your contacts, card photos and notes stay on your device, and reading the text on a card happens there too. Nothing leaves your device on its own — only what you share or back up yourself. Because none of it waits on a network, the app works the same in a basement or a packed exhibition hall as it does on wifi or cellular. One more thing we are proud of: the people you exchange cards with never hear from us. No invitations, no follow-up emails. They get your contact details, and that is all. A PLACE THAT ISN'T YOUR PHONE BOOK Your contacts list is where your relatives, your closest friend and a plumber you used once all live together. Fonym is a deliberate place for the businesses and services you deal with — kept apart from friends and family, and never mixed into the address book that copies itself to every device you own. HOW IT WORKS Store a card six different ways: scan it with the camera, scan a QR code, import a photo, open a vCard file, paste copied text, or type it in yourself. However it arrives, it becomes a contact you can find again — search any field, sort by name, business or most recent, and filter by the tags you added. Share your own card with a QR code that phones read with their built-in camera app, with no app required on their end. The QR code carries the contact itself rather than a link, so there is nothing to load and nothing to look up online — it works even when neither phone has a connection. WHAT YOU CAN DO • Store unlimited cards — camera, QR code, photo library, vCard file, copied text, or manual entry • Review and correct every field before it saves, so your records stay clean • Capture the back of a card into the same contact • Keep the card photo alongside the details • Save phone, mobile, WhatsApp, email, website and address, plus LinkedIn, Instagram, Facebook, TikTok and X • Add your own notes to any contact • Tag contacts, mark favorites, and filter by either • Search every field, and sort by first name, last name, business or most recently added • Call, text or email anyone in your list in a tap • Share your card by QR code, AirDrop, or any messaging app on your phone • Lock the app with Face ID or Touch ID • Make a password-encrypted backup file and keep it wherever you choose • Switch the app's language whenever you like: English, Spanish, Portuguese, German, French or Italian Questions? Email us: [email protected]. You will get an answer from the person who built it.
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These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
Not assessed in a Build Kit yet.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.