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
Fibster: Lie Detector
Discover Fibster, the most advanced lie detector test app ever created
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.0
1 ratings · Below Average
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 included15 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 Fibster: 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
Introduce more diverse and customizable game modes.
Assumption to check: Limited game modes and questions
Validate with people who use this workflow before building.
Hypothesis 2
Implement thorough testing and user feedback loop.
Assumption to check: Low user ratings due to bugs
Validate with people who use this workflow before building.
Hypothesis 3
Add options for sharing results on social media.
Assumption to check: Missing social features
Validate with people who use this workflow before building.
Hypothesis 4
Enhance UI/UX with animations and sound effects.
Assumption to check: Lack of engaging graphics and sound
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
Discover Fibster, the most advanced lie detector test app ever created. A leap beyond other lie detector test apps, utilizing the participant's real physiological (heart rate) data. As questions are asked and answered, Fibster analyzes real-time reactions, subtle changes in the intervals between heartbeats, to determine test results. Ideal for lively game nights or a playful peek into what a polygraph test feels like. Based on scientific principles used in professional polygraph practice, Fibster simplifies complex lie detection into an engaging user experience. With just four questions—two baseline, two relevant—dive into a quick, 80-second truth-seeking adventure. The app guides you on creating effective questions in the FAQs, enhancing your Fibster experience. FAQs are accessed by tapping the icon (?) on the top right of the Home Screen. How it works: Fibster uses technology that turns your camera/flash into a photoplethysmogram (PPG), which is what many wearable devices use to measure pulse. This app goes further than simply measuring pulse, beats per minute (BPM); it analyzes the micro time intervals between heartbeats, which is a key indicator for stress. Then by comparing the changes in stress levels between irrelevant and relevant questions, using our scoring algorithm, it determines test results. The following is a guide to using the app: - Enable iCloud Authentication. - Tap the logo (button) to begin. - Agree to the acknowledgement. - Create two relevant questions, tap next. - Create two irrelevant questions, tap save. - Instructions on question creation are in the FAQs (“?”) section of the app, icon on the top right of the Home Screen. - Review questions, tap start test. - Calibrating message pops up on screen; participant places finger over camera/flash to begin acquiring heart rate data. - Go through all eight test questions. Each question is designed to be at least 10 seconds in order to analyze the required information. - After all questions are completed, the result screen displays the outcome of the test. Attention: - This app is not 100% accurate. - Do not make important decisions based on this app. - Do not force people to use this app (take tests). Disclaimer: This app is designed for entertainment purposes only and is not a substitute for professional polygraph examinations conducted by seasoned examiners with sophisticated instruments. Fibster is not an accredited/recognized polygraph or lie detection device. Heart rate data analyzed during tests is never saved or stored. By downloading and using this app, you agree to the Privacy Policy and Terms of Service: Privacy Policy: https://app.termly.io/document/privacy-policy/42bed339-306e-4d61-b5f3-38364946dd52 Terms of Service: https://app.termly.io/document/terms-of-service/a9202476-3c03-4f35-9764-95dad02fa842
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
expo-av
react-navigation
Axios
BUILD KIT DIFFICULTY
Advanced
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.
