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
Worthium - Net Worth Tracker
Worthium is a simple, private net worth tracker built for people who want clarity without giving up their data.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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'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 Worthium - Net Worth 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
Build a community feedback feature to gather user insights.
Assumption to check: Lack of user reviews and feedback can deter potential users.
Validate with people who use this workflow before building.
Hypothesis 2
Design a user-friendly interface with guided setup.
Assumption to check: Finance apps often have complex UIs that confuse users.
Validate with people who use this workflow before building.
Hypothesis 3
Streamline the linking process and provide clear guidance.
Assumption to check: Difficulty in linking multiple accounts and managing permissions.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance budget tracking with alerts and insights.
Assumption to check: Inadequate budget tracking features may lead to overspending.
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
Worthium is a simple, private net worth tracker built for people who want clarity without giving up their data. Most finance apps require bank connections, accounts, syncing, or ads. Worthium does none of that. Why Worthium? • 100% Offline – No bank connections, no syncing, no cloud • Private by Design – Your data never leaves your device • No Accounts Required – Open the app and start tracking • Ad-Free Forever – No ads, no tracking, no analytics • No subscriptions, no in-app purchases How it works Add your assets and liabilities manually Worthium calculates your total net worth instantly Update over time to see trends and growth Designed for clarity • Track assets like cash, savings, property, vehicles, and investments • Track liabilities like loans, debt, and balances owed • View your total net worth and historical trends at a glance • Optional Face ID lock for added privacy Worthium is built differently. It respects your privacy, avoids unnecessary complexity, and stays out of your way. No ads. No subscriptions. No tracking. Ever.
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
Zustand
react-native-chart
react-native-modal
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.
