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
StackTrack: Precious Metals
Know exactly what your stack is worth — right now.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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.
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 included17 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 StackTrack: Precious Metals: map the core Finance 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
Provide a clear overview and easy navigation between different metal holdings.
Assumption to check: Users find it difficult to keep track of multiple metal types.
Validate with people who use this workflow before building.
Hypothesis 2
Include detailed analysis and historical charts for better investment decisions.
Assumption to check: Limited insights into market trends.
Validate with people who use this workflow before building.
Hypothesis 3
Implement customizable alerts for price changes or market news.
Assumption to check: Lack of notifications for price alerts.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to share their portfolios or insights with friends.
Assumption to check: No social sharing 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
Know exactly what your stack is worth — right now. StackTrack is the portfolio tracker built specifically for precious metals stackers, collectors, and resellers. Whether you're holding a few Maple Leafs or managing a serious bullion position, StackTrack gives you a clear, real-time picture of your entire stack. WHAT YOU CAN DO: - Track gold and silver holdings separately with live spot prices - See your total P&L at a glance — what you paid vs. what it's worth today - Switch instantly between USD and CAD — built for North American stackers - Log every holding with full details: type, weight, quantity, and acquisition cost - Follow market news filtered to the metals you actually own - View 7-day price sparklines to track short-term momentum - Tap the sparkline on the dashboard to open full spot price charts with 1D, 1W, 1M, 3M and 1Y time ranges - Sort holdings by value, P/L, or name - Filter holdings by type — coins, bars, rounds, or misc - Export your holdings to CSV from Settings WHY STACKTRACK: Most portfolio apps are built for stocks. StackTrack is built for metal. No clutter, no irrelevant assets — just your stack, tracked properly. One-time purchase. No subscription. No ads. Download StackTrack and know your stack's worth.
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
Victory Native
Redux
React Navigation
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.
