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
BuyBye - Budget Planner
Budgeting is better with your pig.
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.5
1,731 ratings · Top 15%
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 BuyBye - Budget Planner: 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 AI-driven suggestions for automatic categorization.
Assumption to check: Users find it challenging to categorize transactions accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate interactive charts for better insights.
Assumption to check: Users want better visualization of spending trends.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the budget creation process with templates.
Assumption to check: Setting up budgets can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Expand bank linking options for a wider range of users.
Assumption to check: Limited support for linking accounts.
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
Budgeting is better with your pig. Meet Penny, your money buddy in BuyBye. She earns rewards when you make better money choices, helping budgeting feel more fun, motivating, and a little less overwhelming. BuyBye is the budgeting app that shows you the real cost of your spending. Not just in dollars, but in hours of your life. Most budgeting apps track your money. BuyBye helps you decide how to use it. Use BuyBye to: -Set a monthly budget and see what’s left to spend -Track income, expenses, savings, bills, and no-buy days -Use the Worth It? Analyzer to see what purchases cost in work time -See what your money could become if you invested it instead -Pause impulse buys with Cooldown -Temporarily block shopping apps with Shop Block using Apple’s built-in controls -Create savings goals for travel, an emergency fund, or anything else -Try the 100 Envelope Savings Challenge -Earn rewards with Penny as you build better money habits Subscription Information: Some features in BuyBye require an active subscription. This includes adding income and savings to your BuyBye budget. Subscription terms and pricing are available in the app. Terms of Use: https://www.apple.com/legal/internet-services/itunes/appstore/dev/stdeula/
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
axios
react-navigation
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.
