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
Child Custody Calendar
Child Custody Calendar makes shared parenting simple
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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 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 Child Custody Calendar: map the core Lifestyle 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 a feature to manage multiple custody calendars in one interface.
Assumption to check: Users may find it hard to track multiple calendars for different custody agreements.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize reminder settings for each event.
Assumption to check: Lack of customization options for reminders.
Validate with people who use this workflow before building.
Hypothesis 3
Create a quick access section for notes linked to events.
Assumption to check: Difficulty in quickly accessing notes related to events.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a graphical view of schedules and events for better clarity.
Assumption to check: Limited visual representation of schedules.
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
Child Custody Calendar makes shared parenting simple. Set up your custody schedule once, invite your co-parent, and stay perfectly synced. No more confusion, no more miscommunication, no more unnecessary features. EASY SCHEDULE SETUP • Choose from popular custody arrangements like 2-2-3 or Week On/Week Off. • Customize any schedule to match your parenting plan. • Generates your full calendar automatically. STAY IN SYNC • Both parents see the same calendar in real-time • Changes update instantly on both devices • Know exactly who has the kids, every single day FLEXIBLE WHEN LIFE HAPPENS • Swap days with your co-parent using trade requests. • Claim available days when you want extra time. • Give days when plans change. • Undo accidental changes with one tap. DESIGNED FOR CO-PARENTS • Each parent picks their own color and display name • Clean, simple interface focused on what matters • No complicated features; just your schedule, shared. Simple. Shared. Synced.
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
zustand
react-native-calendars
@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.
