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
LightsOut - Flashlight Timer
LightsOut — Flashlight Timer
$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.
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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/
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 LightsOut - Flashlight Timer: map the core Utilities 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
Include more advanced settings for users to personalize their experience.
Assumption to check: Limited customization options for flashlight settings
Validate with people who use this workflow before building.
Hypothesis 2
Implement a history feature to show past timer uses and allow replays.
Assumption to check: No history tracking of past flashlight uses
Validate with people who use this workflow before building.
Hypothesis 3
Add vibration and sound alerts when the timer ends to enhance user experience.
Assumption to check: Lack of user feedback on timer end
Validate with people who use this workflow before building.
Hypothesis 4
Introduce premium features that offer advanced functionalities such as scheduling timers or themes.
Assumption to check: No premium features for monetization
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
LightsOut — Flashlight Timer Ever wake up to a dead battery because your flashlight stayed on? LightsOut shuts it off automatically. Use LightsOut right from your Lock Screen or Control Center — one tap to start a timed flashlight. Turn on the light, pick a time, and forget it. When the timer ends, LightsOut turns the flashlight off so you don’t drain your battery overnight. FEATURES One-tap Lock Screen + Control Center control Auto-off flashlight timer Presets: 2, 5, 15, and 30 minutes Custom timer up to 120 minutes Widgets Siri & Shortcuts support Four color themes Keeps your screen awake while the timer runs so the flashlight stays on (iOS requirement) Privacy-first: anonymized usage analytics only (theme changes + timer usage). No personal info. No account required No ads. Ever. PERFECT FOR Reading in bed Camping and outdoor use Power outages Anytime you might fall asleep mid-flashlight Set a timer and put your phone down — LightsOut will handle the rest.
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
Zustand
react-navigation
expo-camera
react-native-reanimated
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.
