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
HabitCost – Spend Tracker
HabitCost helps you understand the real cost of your daily habits.
$1.99 · In-app purchases
PRICE
$1.99
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 included14 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 HabitCost – Spend 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 categorization using machine learning.
Assumption to check: Difficulty in categorizing transactions accurately
Validate with people who use this workflow before building.
Hypothesis 2
Add visualizations like charts and graphs for better tracking.
Assumption to check: Lack of visual insights into spending patterns
Validate with people who use this workflow before building.
Hypothesis 3
Introduce alerts for budget limits and trends.
Assumption to check: Limited budget tracking features
Validate with people who use this workflow before building.
Hypothesis 4
Create an onboarding tutorial to guide users through the app.
Assumption to check: Not user-friendly for new users
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
HabitCost helps you understand the real cost of your daily habits. That morning coffee, lunch out, Netflix subscription or gym membership may seem small — but over time they add up to thousands. HabitCost shows you exactly how much your habits cost over months, years and even decades. Key Features Track Your Habits Add any daily, weekly or monthly habit and instantly see how much it costs. Examples: • Coffee • Eating out • Gym membership • Netflix • Shopping See The Real Cost Over Time HabitCost calculates the true long-term impact of your spending. See totals for: • 1 year • 5 years • 10 years • 20 years • Lifetime You might be surprised how much small habits add up. Daily Spending Insights Instantly see how much you spend on habits every single day. Your dashboard shows: • daily cost • yearly totals • total habit spending Understand Opportunity Cost Discover what you could buy instead. Your habit spending could equal: • multiple vacations • new smartphones • emergency savings • investments Simple & Beautiful Design Minimal, fast and designed to make financial awareness effortless. No complicated budgeting. Just clarity. Perfect For HabitCost is perfect for people who want to: • track daily spending • reduce unnecessary habits • understand long-term expenses • improve financial awareness • build smarter habits Start Taking Control Download HabitCost and discover what your habits really cost. Small habits today can mean big money tomorrow.
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
Zustand
react-native-chart-kit
@react-navigation/native
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.
