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
Magic Lie Detector
This app is intended for entertainment purposes only and does not provide true Lie Detector functionality.
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
1 ratings · Top 30%
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 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 Magic Lie Detector: map the core Entertainment 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
Incorporate more diverse tests and user-generated content.
Assumption to check: Limited engagement after initial use due to repetitive nature.
Validate with people who use this workflow before building.
Hypothesis 2
Offer a free trial or limited tests before purchase.
Assumption to check: In-app purchases may deter users.
Validate with people who use this workflow before building.
Hypothesis 3
Enable users to share results directly on social media.
Assumption to check: Lack of social sharing features.
Validate with people who use this workflow before building.
Hypothesis 4
Revamp UI with modern design trends and animations.
Assumption to check: Basic UI design that may feel outdated.
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
This app is intended for entertainment purposes only and does not provide true Lie Detector functionality. Amazing magic on your iPhone created by World Champion Magician, SOMA. Magic Lie Detector is a pure miracle performed in the spectator’s hands. It is so unbelievable that it will leave the audience speechless and amazed. * The basic effect * The spectator selects a card from an ordinary deck of cards. You take out your phone and launch Magic Lie Detector. The app asks a series of questions from the spectator regarding her card. She can lie or tell the truth completely up to her. After every question, the app scans her finger and successfully decides if she is telling the truth or lying. For the final scan, the spectator places both her fingers on the phone and the app tells exactly what card she has chosen. * Custom options * Magic Lie Detector is a 100% customizable app. Whether you want to add some extra questions to the basic effect or create a completely new routine of your own, it doesn’t matter, it is ALL POSSIBLE with Magic Lie Detector. * Quick Facts * - Learn in 3 minutes - Easy to perform - Amazing reactions - In your pocket all the time - Fully customizable - So much fun!
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
Axios
Lottie for animations
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.
