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
Spirit Story Box
Spirit Story Box was named the number one scary app you should NEVER get by the Most Amazing YouTube channel
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.3
120 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 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 Spirit Story Box: 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
Integrate easy sharing options to social media platforms.
Assumption to check: Limited social sharing features
Validate with people who use this workflow before building.
Hypothesis 2
Optimize UI for different screen sizes.
Assumption to check: Inconsistent user experience on various devices
Validate with people who use this workflow before building.
Hypothesis 3
Add comments, ratings and feedback options on stories.
Assumption to check: Lack of community features like comments and ratings
Validate with people who use this workflow before building.
Hypothesis 4
Offer a one-time purchase option for premium features.
Assumption to check: Subscription fatigue from in-app purchases
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
Spirit Story Box was named the number one scary app you should NEVER get by the Most Amazing YouTube channel. Find out why the Huffington Post UK called it, "The Only Ghost-Hunting iPhone App You Will Ever Need." (Note: Spirit Story Box is for entertainment purposes only.) Spirit Story Box is a beautifully designed communication tool designed to allow spirits to generate single- or multi-word messages. It differs from other apps and devices in its use of a unique, proprietary story engine which produces meaningful, simple sentences in addition to single words. The same great app seen on CNET, in the Huffington Post, The Daily Mail Online, and USA Today, totally rewritten and modernized. Same great features: • All of the former add-on features of the original version are now included as part of the base price. • Screensaver mode when running the app for extended periods of time. • Totally reimagined particle visualizations. • Stealth Skin. • Dark theme backgrounds in the History and Features screens. • Frequently Asked Questions section. • Running list of results is saved automatically. Individual entries can be deleted. • Share results with friends. • Accessibility features for persons with disabilities Spirit Story Box: the spirits are telling their stories!
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
Supabase
react-navigation
react-native-image-picker
react-native-sound
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.
