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
Nap Window
Know when your baby should nap.
$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.
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's included13 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 Nap Window: map the core Health & Fitness 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
Allow users to create custom nap schedules with reminders.
Assumption to check: Users may find the app lacks customization options for nap durations.
Validate with people who use this workflow before building.
Hypothesis 2
Provide detailed insights and trends on sleep patterns.
Assumption to check: Limited analytics on nap quality and duration.
Validate with people who use this workflow before building.
Hypothesis 3
Implement clearer labels and a more guided flow for first-time users.
Assumption to check: Potentially confusing navigation between screens.
Validate with people who use this workflow before building.
Hypothesis 4
Add a social component to challenge friends on nap goals.
Assumption to check: No social sharing features to compare nap habits with friends.
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
Know when your baby should nap. Nap Window calculates your baby's next nap window based on their age and when they last woke up. No tracking. No logging. No accounts. Just one clear answer. HOW IT WORKS 1. Enter your baby's age (0-36 months) 2. Set when they last woke up 3. See the recommended nap window That's it. Nap Window uses age-appropriate wake windows — the typical amount of time babies can comfortably stay awake before needing sleep. Every baby is different, so use this as a starting point and adjust based on your little one's cues. FEATURES • Simple, calm interface • Works instantly — no setup required • Supports ages 0-36 months • No accounts or sign-ups • No tracking or data collection • No ads, no subscriptions Parents are tired. You don't need another app asking you to log every nap. Nap Window answers one question and gets out of your way.
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
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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.
