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
Finance Sage
FinanceSage — Personal Finance Tracker
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 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 Finance Sage: 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
Focus on a streamlined, minimalist design that emphasizes essential features.
Assumption to check: Users often find finance apps overwhelming due to too many features.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate bank linking for automatic transaction imports.
Assumption to check: Manual entry of transactions can be tedious.
Validate with people who use this workflow before building.
Hypothesis 3
Use clear progress indicators and visual graphs for budget tracking.
Assumption to check: Budget tracking can be confusing if not visualized properly.
Validate with people who use this workflow before building.
Hypothesis 4
Provide transparent pricing and a clear value proposition for each subscription tier.
Assumption to check: Subscription models can be unclear or seem expensive.
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
FinanceSage — Personal Finance Tracker Take control of your money with FinanceSage, the simple and powerful personal finance app designed for everyday use. Whether you're tracking daily expenses, managing monthly budgets, or learning the fundamentals of personal finance — FinanceSage has you covered. TRACK YOUR MONEY Log income and expenses in seconds. Categorize transactions with built-in categories like Food & Dining, Transport, Housing, Entertainment, and more. Search, filter, and review your full transaction history at any time. MONTHLY BUDGETS Set spending limits for each category and watch your progress in real time. Color-coded budget cards instantly show you what's on track, what's approaching the limit, and what's over budget — so you always know where you stand. DASHBOARD AT A GLANCE Your personalized dashboard shows your monthly balance, income vs. expenses summary, budget snapshot, and recent transactions — all in one clean view. Start every day knowing exactly where your finances are. LEARN PERSONAL FINANCE Master the concepts that matter most with our built-in learning module. Bite-sized lessons cover topics like Compound Interest, Budgeting Basics, Investing Basics, Debt Management, Emergency Fund, Net Worth, Rule of 72, and Savings Goals. Track your progress with streaks and completion badges. CLOUD SYNC — NO ACCOUNT NEEDED Sync your data across devices or share finances with your partner using a simple 6-character code. No registration, no email, no password. Your data is backed up securely and can be restored anytime. PRIVATE & SECURE FinanceSage stores your data locally on your device by default. Cloud sync is optional and requires no personal account. We never sell your data or show you ads. CLEAN, INTUITIVE DESIGN Built with a focus on simplicity and speed. Light and dark mode supported. Works great on all iPhone models. WHAT'S INCLUDED • Income & expense tracking with categories • Monthly budget management with progress bars • Dashboard with balance overview and quick actions • 8 personal finance learning topics with streak tracking • Cloud sync between devices using a 6-character code • No ads, no subscriptions, no account required Download FinanceSage today and start building better financial habits — one transaction at a time.
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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
Zustand
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.
