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
VaultArm: Firearm Inventory
VaultArm is the ultimate privacy-first firearm inventory app built for responsible gun owners.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
2 ratings · Top 50%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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 VaultArm: Firearm Inventory: map the core Productivity 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
Implement advanced encryption for sensitive data.
Assumption to check: Complexity in managing firearm details securely
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set custom reminder intervals and types.
Assumption to check: Limited customization options for reminding users
Validate with people who use this workflow before building.
Hypothesis 3
Add tagging and filtering features for better categorization.
Assumption to check: Difficulty in categorizing firearms effectively
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate robust privacy settings and clear data usage policies.
Assumption to check: Potential user privacy concerns
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
VaultArm is the ultimate privacy-first firearm inventory app built for responsible gun owners. Whether you're a collector, enthusiast, or professional, VaultArm helps you track, organize, and manage your firearms with confidence. Now with location tracking for each firearm, you can easily stay on top of where everything is stored—at home, in a safe, or offsite. * Privacy-First Design: Your data stays on your device—no cloud storage, no accounts, no tracking. * Detailed Firearm Records: Store make, model, caliber, serial number, condition, and photos for every firearm. * Location Tracking (NEW): Assign a location to each firearm—helpful for managing multiple safes or storage spots. * Photo & Document Storage: Add images of receipts, certifications, or other important documents. * Maintenance Tracking: Log cleaning, service, or modifications to help keep your collection in top shape. * Import/Export Data: Back up your data or move it to a new device easily with CSV file export/import. * Universal App: Works on iPhone and iPad. Pay once—no subscriptions, no in-app purchases. Why Choose VaultArm? 1. Designed for privacy-conscious firearm owners 2. Built for collectors, professionals, and everyday gun owners 3. Simple one-time purchase: just $4.99 4. Always improving with regular feature updates
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
Zustand
React Native Elements
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.
