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.
Your day, before you unlock.
$2.99
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.
Your day, before you unlock. Calpaper turns today's calendar into your Lock Screen wallpaper. Every morning a fresh wallpaper is drawn with the events you have today, the reminders you typed, a note to self, countdowns to the dates you're waiting for, the month at a glance and a photo you love. Lift your phone and you already know what's next. Nothing to open, nothing to forget. KNOW WHAT'S NEXT AT A GLANCE • Today's events from the calendars already on your iPhone: iCloud, Google, Outlook, whichever you use. • Times, titles and calendar colors, laid out so the next thing is the first thing you read. • Tag each event with its calendar's name, or turn the color bars off for a quieter look. MAKE IT YOURS • Ten calm colors or your own photo, and four typefaces. • A photo card: one picture from your library, in its own shape and the size you pick, in an instant-photo frame with a caption if you like. • Emoji anywhere on the wallpaper: drag, resize and turn them into place. • Reorder or hide any block; the stack sits right under the clock or centered below it. • Fade everything with one slider so the background shows through. • The note becomes a card in a color you choose, so it can't be missed. • A month card with today marked, with optional week numbers and weekend tint. • Fits both Lock Screen clocks, the large one and the compact one. • Larger text, if you need it. THE SMALL THINGS, WHERE YOU'LL SEE THEM • Reminders are short lines you type in Calpaper. No lists, no due dates, just the two or three things that matter today. • The note is one line to yourself: a mantra, a nudge, a reason to smile. • Countdowns turn the dates you're waiting for into a journey to an emoji, a step closer every morning, with the days left, as many as you like. SET IT ONCE, FRESH EVERY MORNING iOS doesn't let apps change the wallpaper by themselves, so Calpaper pairs with Apple's Shortcuts app. A one-time setup of about three minutes, with every tap shown step by step, creates a daily automation. From then on your wallpaper updates every morning on its own. Changed something, or added an event? One tap updates it now, in the app or from the Home Screen icon. PRIVATE BY DESIGN Calpaper reads today's events on your device and draws them on your device. Your calendar, notes and photos never leave your phone, and there is no account. Anonymous usage stats are optional and off until you allow them. ACCESSIBLE Works with VoiceOver, Dynamic Type and Reduce Motion, and the wallpaper itself has a larger-text option. One purchase, everything included: no subscription, no ads and no account. Available in English, Spanish, Portuguese, German, French, Japanese and Korean.
Written user reviews are not shown here. Check current App Store reviews >
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.