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
Gem - Money tracker
Log expenses and stay on budget.
$0.49 · In-app purchases
PRICE
$0.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
89 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 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 Gem - Money tracker: 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
Implement automatic transaction categorization using AI.
Assumption to check: Users find it difficult to categorize transactions correctly
Validate with people who use this workflow before building.
Hypothesis 2
Enhance budget tracking with more detailed analytics and alerts.
Assumption to check: Limited budget tracking features
Validate with people who use this workflow before building.
Hypothesis 3
Simplify pricing structure and provide clear benefits for each tier.
Assumption to check: Subscription model can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate in-app chat support or a better help center.
Assumption to check: Lack of customer support options
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
Log expenses and stay on budget. No subscription. In-app purchases are tips :) BUDGET - Daily, weekly, monthly and yearly - Average & daily spending, breakdown by category - Compare against same day last month - Rearrange your budgets, and other lists - Explore your costs and salary over time ORGANIZE - By category, budget, wallet, account, tag… - Customize category colors & icons (500+ from Apple) - Favorite accounts, custom sorting, merge categories - Add attachments and receipts BILLS - Repeat: day, week, month, year - View paid & upcoming subscriptions MONEY TOOLS - Savings goals, income, transfers, balance - Multiple currencies, exchange rates - Calculator & journal view WALLET SYNC & AUTOMATIONS - Instant recording when paying in store with Apple Pay (requires setup) - Auto-organize expensesbased on merchant names - App shortcuts and “Send to Gem” in share sheet - Import CSV files, sub-categories, notes. Import into specific wallet. Skip duplicates when importing - Export everything MORE - Customize the way your create entries - Widgets. Lock Screen shortcut - Daily iCloud backup - Daily reminders - Custom main screen, list layouts, app menu and theme - Insights in search results PREVIEW FEATURES May not work as expected :) - Type “Rent” → it’s categorized in “Household” - Detect receipt prices from attachments Need help? Have a suggestion? Email me at [email protected]. Terms & privacy: shelftwo.com/gem/terms
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
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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.
