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
Birthday Countdown & Gift List
Stay on top of upcoming birthdays with the Birthday Countdown & Gift List app! Our app is packed with features that make remembering birthdays and organizing your gift giving a breeze.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
309 ratings · Top 5%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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 included19 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 Birthday Countdown & Gift List: 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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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
Implement reminders or notifications for pending gifts.
Assumption to check: Users often forget to update gift statuses.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to add images or links to gift ideas.
Assumption to check: Limited customization for gift ideas.
Validate with people who use this workflow before building.
Hypothesis 3
Add a gift grouping feature by recipient.
Assumption to check: Difficulties tracking multiple gifts for the same person.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate social media sharing for gift ideas and birthday wishes.
Assumption to check: Not enough social sharing options.
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
Stay on top of upcoming birthdays with the Birthday Countdown & Gift List app! Our app is packed with features that make remembering birthdays and organizing your gift giving a breeze. Features Include: - Birthday countdown widgets - Birthday reminder notifications - Create a gift list for each person - Add a yearly budget and track overall spending - Assign individual budgets for each recipient - Track your spending with various graphs - Share your list & collaborate with other users - Automatically sync devices (Ex. iPhone / iPad) - Passcode protect your list (optional) - View birthdays & gift lists from previous years - Back up your lists to iCloud - Print your list using AirPrint - Shop hand-picked gift ideas -- Collaborative List Making -- Seamlessly create and share your birthday list with other users. Updates are shared in real time. Need to keep certain gifts a secret? Mark gifts 'private' if needed.
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
Supabase
@react-navigation/native
expo-date-picker
@supabase/supabase-js
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.
