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 - Spirit box
The Necrometer - Spirit Box app, designed specifically for ghost hunters and paranormal enthusiasts, offers a range of features to detect and communicate with spirits
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.2
45 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 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 - Spirit box: 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
Add more audio effects and options for users to customize their experience.
Assumption to check: Limited functionality for spirit communication
Validate with people who use this workflow before building.
Hypothesis 2
Focus on improving user interface and experience.
Assumption to check: Poor user ratings indicate dissatisfaction
Validate with people who use this workflow before building.
Hypothesis 3
Integrate a guided tutorial on first use.
Assumption to check: Lack of clear instructions on use
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations and value for premium features.
Assumption to check: In-app purchases may be unclear
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
The Necrometer - Spirit Box app, designed specifically for ghost hunters and paranormal enthusiasts, offers a range of features to detect and communicate with spirits. By incorporating innovative techniques and theories of spirit communication, this multifunctional app provides a unique and comprehensive experience. One of the key features of the app is the meter that detects and measures magnetic energy. By utilizing your phone's Magnetometer sensor, the app can identify and analyze fluctuations in magnetic interference within the environment. These fluctuations are believed to be influenced by spirits and directly impact communication. Additionally, the optional meter noise reacts to these fluctuations, further enhancing the user's experience. By toggle the power button to "Speech" mode, users activate a unique feature of the app. This mode is specifically designed to facilitate ghost box and EVP-like communication. Through the utilization of advanced speech generation technology, the app provides audible spirit communication like no other. This feature adds an extra layer of immersion and enhances the overall experience for users. In conclusion, the Necrometer app is a cutting-edge tool for ghost hunters and paranormal enthusiasts. With its ability to detect and measure magnetic energy, offer text and speech modes, and provide various customization options, it revolutionizes the field of spirit communication. By incorporating known techniques and theories, this app opens up new possibilities for exploring the spirit realm.
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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-av
react-navigation
TypeScript
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.
