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
Night Light Pro Nightlight
Trying to fall asleep? Now you can, with Night Light Pro
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
966 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.
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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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What's included16 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 Night Light Pro Nightlight: 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
Offer a wider range of colors and effects.
Assumption to check: Limited color options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced timer options, like custom durations or multiple timers.
Assumption to check: Timer functionality is basic and lacks flexibility.
Validate with people who use this workflow before building.
Hypothesis 3
Add sound features for a more immersive nightlight experience.
Assumption to check: No option for music or sound integration.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the paywall and offer clear value for premium features.
Assumption to check: In-app purchases can be confusing.
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
Trying to fall asleep? Now you can, with Night Light Pro. Upgrade your sleep today! Some of our GLOWING reviews: “Me and my kids l-o-v-e this app, 5 stars!!!” Night Light nightlight to help you fall asleep and stay asleep. Night Light projects a glowing light onto your ceiling and walls that will help you fall asleep while playing peaceful sounds to relax to. “Slept like a ROCK last night thanks to this Nightlight app” Night Light is a 100% easy to use nightlight to help you fall asleep and stay asleep. Night Light projects a glowing light onto your ceiling and walls that will help you fall asleep while playing peaceful sounds to relax to. “This helped with my insomnia and made me sleep better than ever, I use it every night!” All you need to do is download the app on your iOS device, select your nightlight colors, optional sleep sounds, screen brightness, sleep timer and flashlight settings - then place your device on a night stand or near a corner in a room for the best illumination. MOST POPULAR FEATURES + Custom nightlight colors or a glowing range of colors with multi-color mode. + Sounds to sleep to including beach waves, running water, white noise and more! + Build your sleep sound library by visiting the sound store. Earn credits each night you use Night Light to unlock even more awesome free features and content to help make your sleep even more restful. + Customize your LED torch flash light settings to a custom brightness to help illuminate your bedroom or personal space to keep it as well lit as you would like! Night Light is the #1 night light app that not only illuminates your bedroom but also helps you sleep better and get a more restful nights sleep!
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
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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.
