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.
App Overview
The Big Keyboard
LARGE TEXT & BIG KEYS:
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
13 ratings · Top 50%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for The Big Keyboard: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Provide more themes and key layouts.
Assumption to check: Limited customization options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the navigation and provide guided onboarding.
Assumption to check: User interface can be confusing for new users
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate voice input as an additional feature.
Assumption to check: Lack of advanced features like voice typing
Validate with people who use this workflow before building.
Hypothesis 4
Optimize keyboard performance for smoother experience.
Assumption to check: Performance issues with larger keys on older devices
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
LARGE TEXT & BIG KEYS: Scale text size up to 2.5x larger - perfect for better readability Button sizes stay comfortable while text gets bigger No more squinting at tiny letters Word suggestions + Autocorrect Supported Keyboard Languages: English, Spanish, Portuguese, Dutch, Italian, German (QWERTZ), French (AZERTY), Finnish, Danish, Polish, Turkish, Romanian, and Swedish. MULTIPLE KEYBOARD LAYOUTS: Full QWERTY keyboard with smart auto-capitalization Dedicated numeric keypad for numbers Arrow keys for precise cursor control Complete emoji collection with categories Symbols and punctuation layouts CUSTOMIZABLE EXPERIENCE: Light, Dark, High Contrast and themes Adjustable text and emoji sizes Sound and haptic feedback controls ACCESSIBILITY FOCUSED Perfect for users with vision difficulties Large, clear text that's easy to read High contrast themes for better visibility Simple, intuitive design EASY TO USE Quick setup in just minutes Works with all your favorite apps Smooth, responsive typing experience No complicated settings - just works! Why choose The Big Keyboard? Unlike other keyboards that make everything bigger, The Big Keyboard smartly scales only the text while keeping buttons the perfect size. This means better readability without losing screen space! Perfect for: Seniors who need larger text Users with visual impairments Anyone who wants a more comfortable typing experience People who prefer customizable keyboards Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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BUILD KIT DIFFICULTY
Intermediate
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.
