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
TravelSpend: Travel Budget App
TravelSpend is an app to track your spending while traveling the world
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
2,005 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 TravelSpend: Travel Budget App: map the core Travel 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 an AI-driven auto-categorization feature to simplify this process.
Assumption to check: Users often find it difficult to categorize expenses accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce receipt scanning or integration with bank accounts for automatic expense tracking.
Assumption to check: Manual entry of expenses can be tedious.
Validate with people who use this workflow before building.
Hypothesis 3
Provide analytics and visual graphs to help users understand their spending patterns.
Assumption to check: Limited insights on spending habits.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a clearer explanation of premium features and provide a limited-time trial to entice users.
Assumption to check: Subscription model may confuse some 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
TravelSpend is an app to track your spending while traveling the world. It's perfect for you if you are planning your next trip or are already on vacation. If you travel in a group you can share expenses with friends and family to see “who owes who.” This app is for travelers like you - no matter if you are a solo traveler on a sabbatical, a couple backpacking together or a group of friends on a weekend holiday. Try it now for free! (unlimited free expenses) TRACK YOUR TRAVEL EXPENSES We designed TravelSpend specifically for travelers. It's quick and easy to use and works offline. You can add photos and spread expenses over multiple days. STICK TO YOUR BUDGET The app will help you keep track of your travel budget and to save money. DON'T WORRY ABOUT CURRENCY EXCHANGE RATES Add expenses in any currency. They will automatically convert to your home currency. SHARE & SYNC Invite friends or family and organize your budget together. Your data syncs in real-time across multiple devices. SPLIT COSTS Share your trip with your partner or a group of friends and keep track of who owes whom. Split bills, check your balances and settle debts all within TravelSpend. GAIN INSIGHTS FROM YOUR SPENDING See your spending data visualized. You'll be able to analyze your spending so you can avoid overspending. EXPORT YOUR DATA To create expense reports you can easily export your spending data to a CSV file anytime. ——— You can use the app free of charge forever. Some functionality can be activated by purchasing the “Premium” version. ——— Terms of Service: https://travel-spend.com/terms Privacy Policy: https://travel-spend.com/privacy_policy
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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
React Navigation
React Query
Zustand
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.
