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
Birthdex
Birthdex is a beautifully simple birthday archive designed to help you remember the people who matter most.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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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 Birthdex: 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
Offer more detailed insights and personalized features.
Assumption to check: Limited functionality compared to similar apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement a history feature to review past analyses.
Assumption to check: No history tracking
Validate with people who use this workflow before building.
Hypothesis 3
Introduce user preferences for settings and themes.
Assumption to check: Lack of customization options
Validate with people who use this workflow before building.
Hypothesis 4
Allow more free uses before requiring payment.
Assumption to check: Paywall too restrictive
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
Birthdex is a beautifully simple birthday archive designed to help you remember the people who matter most. Save birthdays, organize your contacts your way, and get thoughtful reminders before important days arrive. Birthdex combines the feeling of a classic indexed phonebook with a modern, minimal interface built for speed and clarity. FEATURES • Keep all birthdays in one elegant, easy-to-scan archive • Jump quickly through your list with an A–Z index slider • Instantly search and sort contacts • View upcoming birthdays at a glance • Browse birthdays in a clean calendar view • Add notes, avatars, and photos for each person • Customize reminder timing before birthdays • Export and import your archive for backup and restoration • Personalize the app with appearance settings • Enjoy optional sound effects and tactile haptics Birthdex is designed thoughtfully so you can spend less time managing dates and more time celebrating people. Whether it’s close friends, family, coworkers, clients, or the people you never want to forget, Birthdex keeps your birthday archive beautifully organized.
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.
SUGGESTED BUILD STACK
React Native
Expo
react-navigation
expo-date-picker
react-native-share
async-storage
BUILD KIT DIFFICULTY
Starter
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.
