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.
Type a number, get an answer
$2.99 · 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.
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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.
Rork plan preview for NumPad: Your Number Keyboard: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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.
Hypothesis 1
Assumption to check: Limited customization options for keyboard layouts.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent haptic feedback on button press.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No option to feedback to developers directly from the app.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of support for multi-language input.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Type a number, get an answer. NumPad adds a full numeric keypad to every keyboard on your phone — and now it computes as you type: finish "1200*0.0825" and the answer floats above your cursor before you even reach for the "=" key. NEW IN 2.0: LIVE MATH, WHILE YOU TYPE Start typing an expression — "84.50*1.18", "250-20%", "3*12+40" — and a floating result chip appears above the cursor before you finish. Tap it to insert the answer, or keep typing to refine the expression. It's the same calculator engine that powers the "=" key and Siri, just faster to reach. A NUMPAD FOR YOUR ACTUAL WORK Swap in a specialized row of keys for what you're doing, six packs to choose from: • Finance — currency symbols for quick price entry • Symbols & Science — π, √, ^, °, and other math notation • Programmer — hex prefixes and bitwise operators • Date & Time — insert today's date or the current time with one tap • Units & Conversion — length, mass, and temperature keys with a live offline converter • Cooking & Baking — fraction keys (½ ⅓ ¼) plus a cups-to-milliliters converter Long-press "%" for a two-step tax + tip calculator. Long-press "." for reusable text snippets. Long-press "0" for clipboard history. Long-press "=" for the unit/recipe converter. Every calculation lands on a running result tape you can revisit. BUILT ON APPLE'S NEWEST FRAMEWORKS NumPad 2.0 speaks Siri: "Calculate with NumPad," "Convert units with NumPad," and "Calculate a tip with NumPad" work the moment the app is installed — no setup, no configuration, and every pack's math runs fully offline. On iOS 26 devices, the optional Glass theme uses real Liquid Glass material — refractive, depth-aware, and matched to a dark twin so it looks right in both appearances. A CUSTOM KEYBOARD, YOUR LAYOUT Pro unlocks a keyboard you build yourself: keep the numpad in the middle and add up to three of your own sections around it — a top row and two side columns — filled from a drag-and-drop key library (characters, cursor arrows, Tab, Hide Keyboard, or live date/time tokens). Choose left- or right-handed layout for your columns. Every edit previews live before you save it. DESIGNED FOR IPAD TOO On a wide iPad, overlays (clipboard, snippets, converter) open as a side panel instead of covering your work, keys respond to pointer hover, and clipboard/snippet rows support drag-and-drop straight into the host app. Pick from four keyboard heights — Small, Default, Tall, or (Pro) Kiosk-sized — so the keypad fits a phone in one hand or an iPad mounted at a checkout counter just as well. KIOSK-READY FOR POINT-OF-SALE AND FRONT-DESK USE The Pro Kiosk height preset was built for iPads that live somewhere other than a pocket — a receptionist's check-in tablet, a self-serve order screen, a warehouse counting station. It's the same numeric keypad your team already knows, sized to be legible and tappable from arm's length, with zero extra hardware or backend to stand up. SEVENTEEN THEMES, 17 WAYS TO MAKE IT YOURS From clean White to deep Indigo to the new iOS 26 Liquid Glass pair — pick a look, or let Automatic Dark Mode switch it for you. PRIVACY, THE WAY A KEYBOARD SHOULD WORK NumPad's keyboard extension never logs analytics and never tracks your keystrokes — full access is used only for clipboard history, haptics, and key-click sounds, entirely on your device. There's no subscription: every pack and Pro are one-time purchases, and every purchase is Family Sharing enabled, so up to five family members can use what you bought at no extra cost. WHAT'S INCLUDED IN THE APP The full numeric keypad, Math keys, 15 classic themes, snippets, clipboard history, and the tax + tip calculator — yours with the app, with no subscription and no account. WHAT PRO ADDS ($11.99, one time) Every pack, the Liquid Glass themes, the custom keyboard editor, iCloud sync across your devices, and the Kiosk height preset — one purchase, forever.
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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.
From the Build Kit assessment.
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.