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
Necrometer: Ghost Detector EMF
Necrometer is a powerful Ghost Detector, EMF Scanner, EVP Recorder, and Spirit Box experience designed for paranormal investigation enthusiasts
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
2 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.
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's included17 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 Necrometer: Ghost Detector EMF: 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
Include more advanced features such as ghost interaction or augmented reality.
Assumption to check: Limited functionality and features compared to other ghost detection apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement gamification elements to encourage repeated usage.
Assumption to check: Low user engagement after initial use.
Validate with people who use this workflow before building.
Hypothesis 3
Provide calibration options for users to improve accuracy.
Assumption to check: Potential inaccuracies in EMF readings.
Validate with people who use this workflow before building.
Hypothesis 4
Create a social element where users can share experiences and findings.
Assumption to check: Lack of community features.
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
Necrometer is a powerful Ghost Detector, EMF Scanner, EVP Recorder, and Spirit Box experience designed for paranormal investigation enthusiasts. Turn your device into a cinematic paranormal investigation tool. Using your device’s built-in sensors, immersive audio systems, and real-time signal simulation, Necrometer creates a cinematic ghost hunting experience for exploring paranormal activity, electromagnetic anomalies, and EVP communication sessions. Whether you are investigating haunted locations, testing EMF fluctuations, or experimenting with spirit communication tools, Necrometer delivers an atmospheric paranormal toolkit directly on your device. FEATURES EMF Scanner & Ghost Detector • Real-time EMF scanner with dynamic magnetometer readings • Detect unusual electromagnetic fluctuations and anomalies • Live waveform graph with cinematic visual effects • Ghost detector inspired activity alerts • Session-based paranormal tracking system • Peak EMF statistics and anomaly history Spirit Box & ITC Communication • Advanced Spirit Box inspired communication mode • 60+ paranormal words, phrases, and responses • Real-time ITC text generation system • Glitch animations and atmospheric effects • Spirit strength meter with intensity-based activity • Rare paranormal event triggers during high EMF activity EVP Recorder & Audio Scanner • EVP scanning and paranormal audio simulation • Real-time EVP signal generation experience • Animated audio spectrum visualizer • 3 immersive voice styles: - Whisper - Robotic - Ethereal • Adjustable pitch, echo, distortion, and reverb controls • EVP recording and playback support Paranormal Investigation Sessions • Automatic session recording and storage • Investigation history and anomaly timeline • Save EMF spikes, EVP responses, and spirit messages • Local storage for all paranormal session data Customization & Atmosphere • Adjustable EMF sensitivity settings • Intensity and anomaly frequency controls • Atmospheric particle effects • Haptic feedback and immersive sound design • Battery optimization mode for longer investigations WHY NECROMETER? • Immersive ghost hunting experience • Advanced EMF scanner simulation • Atmospheric Spirit Box interface • Paranormal-inspired EVP communication system • Dark cinematic UI designed for horror and investigation fans • Optimized for immersive late-night paranormal sessions DISCLAIMER Necrometer is intended for entertainment purposes only. This application does not claim to detect, contact, or communicate with real spirits, ghosts, or paranormal entities. All responses, generated signals, and communication simulations are fictional and designed solely for entertainment experiences.
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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-sensors
react-navigation
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.
