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
Last Light: Sleep Companion
Last Light is a simple, calming tool designed to help you wind down when sleep feels just out of reach.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
6 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 included18 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 Last Light: Sleep Companion: 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
Implement reminders or notifications to prompt users to log their sleep.
Assumption to check: Users often find it hard to remember to log their sleep entries.
Validate with people who use this workflow before building.
Hypothesis 2
Offer a wider variety of sounds or the option to upload personal sounds.
Assumption to check: Limited sound options for sleep sounds.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance user experience with clearer navigation cues and onboarding tutorials.
Assumption to check: Some users report difficulty navigating through the app.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing features to encourage community engagement.
Assumption to check: Lack of social features to share progress.
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
Last Light is a simple, calming tool designed to help you wind down when sleep feels just out of reach. Instead of complicated sleep tracking or endless settings, Last Light offers a quiet visual experience that helps the mind slow down and settle. It is designed for the moments when you are tired but your mind is busy — or when you find yourself scrolling longer than you meant to and want a gentler way to step away from the screen. Open the app, follow the slow visual rhythm, and allow your attention to soften. The experience is intentionally minimal so it feels approachable even when you are stressed, restless, or awake later than you hoped to be. Last Light was built with a single goal: to create a calm, elegant space that helps ease the transition from wakefulness into rest. No accounts. No data collection. Just a quiet companion for the end of the day — or the middle of the night.
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 Navigation
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.
