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
LullaLite – Night Light
Perfect gentle light for nighttime feeding and diaper changes
$1.99 · In-app purchases
PRICE
$1.99
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
Make this idea yours
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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Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included14 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 LullaLite – Night Light: 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
Allow users to create and save favorite colors.
Assumption to check: Limited color options and customizability.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate calming soundscapes with light settings.
Assumption to check: Lack of sound or music integration.
Validate with people who use this workflow before building.
Hypothesis 3
Add ability to share favorite light settings with friends.
Assumption to check: No social sharing features.
Validate with people who use this workflow before building.
Hypothesis 4
Include onboarding tutorials to enhance user understanding.
Assumption to check: Minimal tutorial or guidance for new users.
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
Perfect gentle light for nighttime feeding and diaper changes. Choose from 6 soft colors with smooth brightness control. Baby stays asleep with our completely silent, text-free design. ■ Key Features • 6 soothing colors (white, warm, pink, blue, green, purple) • Smooth brightness adjustment for perfect lighting • Sleep timer: 15/30/45/60 minutes auto-off • Text-free UI for intuitive operation • Completely silent - no sounds or vibrations ■ Perfect For Parents during night feedings, caregivers changing diapers, anyone needing a bedtime reading light, meditation and relaxation sessions, and all who value peaceful, quiet moments. ■ How It Works 1. Open the app for instant light 2. Tap color buttons to choose your shade 3. Slide to adjust brightness 4. Set timer for automatic shutdown ■ Privacy & Security Zero data collection. No internet required. No ads or in-app purchases. One-time purchase for peace of mind. A gentle companion for your quiet nights.
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
@react-native-community/color-picker
expo-slider
Zustand
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.
