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 PRO: Spirit Box EVP
Necrometer brings the classic tools of paranormal investigation into a single app — an EMF-style
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
21 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 included16 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 PRO: Spirit Box EVP: 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 a guided tutorial on first launch.
Assumption to check: Users report difficulty in understanding how to use EVP features
Validate with people who use this workflow before building.
Hypothesis 2
Implement better audio processing algorithms.
Assumption to check: Some users experience audio quality issues
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to rename and categorize recordings.
Assumption to check: Limited customization options for recordings
Validate with people who use this workflow before building.
Hypothesis 4
Integrate a social sharing feature to enhance user engagement.
Assumption to check: Lack of community features for sharing experiences
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 brings the classic tools of paranormal investigation into a single app — an EMF-style field meter, a spirit box, EVP-style audio, and an entity radar. Built for ghost hunters, paranormal enthusiasts, and anyone drawn to the unexplained. It is a long-standing idea in paranormal research that spirits may influence electromagnetic fields and electronic audio. Necrometer is built around that theory: a full kit to work a location and see what comes through. For paranormal investigation and entertainment. FIELD METER An EMF-style meter that responds to your device's magnetometer, with a five-lamp ramp, a sweeping needle, and haptic pulses that rise as readings climb. Investigators believe sudden shifts in a local field can mark a presence — Necrometer surfaces those shifts with a live 60-second history, adjustable sensitivity, and one-tap re-zeroing. SPIRIT BOX A continuous sweep with words breaking through the noise, inspired by classic ITC concepts. Four distinct voices, an atmospheric FX control, and a live transcript that grades every phrase A, B or C for clarity. Ask your questions and listen to what answers. ENTITY RADAR A directional scope that tracks a contact as it locks — range, bearing, and confidence at a glance, with an uncertainty arc that tightens the closer you get. EVP & THE HUNT Every session is different. Work the room, watch the meter, and see how the readings, the words, and the radar line up. What you make of it is yours to decide. Necrometer is one of the most complete paranormal toolkits on the App Store — atmospheric, unpredictable, and built for the hunt. Important note This app is built for paranormal enthusiasts and entertainment use. Readings and messages can be influenced by normal environmental factors and should not be treated as scientific proof.
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
react-native-audio
Lodash
expo-permissions
BUILD KIT DIFFICULTY
Intermediate
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.
