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
FuelUp - Gas Prices & Savings
SAVE MONEY ON EVERY FILL-UP
$29.99 · In-app purchases
PRICE
$29.99
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 FuelUp - Gas Prices & Savings: map the core Navigation 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 a more intuitive search and filter system.
Assumption to check: Difficulty in finding nearby gas stations quickly
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate real-time price updates and verification.
Assumption to check: Inaccurate gas prices reported by users
Validate with people who use this workflow before building.
Hypothesis 3
Provide more detailed savings analytics and notifications.
Assumption to check: Limited savings tracking features
Validate with people who use this workflow before building.
Hypothesis 4
Introduce gamification elements to encourage user participation.
Assumption to check: Lack of user engagement features
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
SAVE MONEY ON EVERY FILL-UP FuelUp helps you find the cheapest gas prices near you with real-time crowdsourced data. Stop overpaying at the pump - join thousands of smart drivers saving hundreds of dollars every year on fuel costs. FIND CHEAP GAS INSTANTLY • Interactive map with color-coded price pins (green = cheapest) • Live fuel prices updated by real drivers in your community • Sort and filter stations by distance, price, or fuel type • One-tap navigation via Apple Maps, Google Maps, or Waze • Works offline with 24-hour smart caching • Search any address to plan fuel stops before your trip ALL FUEL TYPES SUPPORTED Regular (87), Midgrade (89), Premium (91-93), Diesel, E10, E5, E85, LPG Perfect for all vehicles: cars, trucks, SUVs, RVs, motorcycles, and diesel engines. COMMUNITY-POWERED ACCURACY Real prices from drivers at the pump, not outdated databases. Report prices in seconds and earn points for contributions. Community verification ensures accuracy. See when prices were last updated and by which user level. GAMIFICATION AND REWARDS • Earn points for price reports and verifications • Level up from Bronze to Silver, Gold, and Platinum • Compete on regional and national leaderboards • Track your contribution history and impact • Unlock achievement badges for milestones ADVANCED SAVINGS TOOLS • Price History Charts: 30-day trend graphs to fuel up at the best time • Tank Calculator: See exact dollar savings between stations • Price Alerts: Get notified when favorite stations drop prices • Favorites System: Save unlimited stations for quick access • Top Tier Filter: Find certified high-quality fuel stations • Custom Search: Check gas prices anywhere, not just nearby • iCloud Sync: Access favorites across iPhone, iPad, Apple Watch • Home Widgets: Check prices without opening the app • CarPlay Integration: Hands-free station finding while driving • Apple Watch App: Check prices from your wrist PERFECT FOR EVERY DRIVER • Daily commuters maximizing savings on regular fill-ups • Rideshare drivers (Uber, Lyft, DoorDash) minimizing fuel costs • Road trippers planning cross-country fuel stops • RV travelers managing large fuel budgets • Fleet managers tracking fuel expenses • Budget-conscious families reducing transportation costs • Diesel truck drivers needing competitive pricing • Eco-conscious drivers optimizing fuel efficiency WORLDWIDE COVERAGE Access fuel price data across United States, Canada, United Kingdom, Australia, New Zealand, and major European countries. PRIVACY-FIRST DESIGN • Local storage - your data stays on your device • No tracking when app is closed or in background • Minimal permissions required • Sign in with Apple for maximum privacy • GDPR and CCPA compliant WHY CHOOSE FUELUP • Real-time crowdsourced data, not outdated price feeds • Offline functionality with intelligent caching • Full Apple ecosystem support: iPhone, iPad, Watch, CarPlay • Active gamification keeps community engaged • Privacy-focused - no location tracking or data selling • Regular updates and new features • Fast and responsive customer support SUPPORT AND RESOURCES • In-app support chat for quick assistance • Email: [email protected] • Comprehensive FAQ and video tutorials • Active development with regular updates Download FuelUp today and start saving money on every tank. --- By downloading FuelUp, you agree to our Terms of Service (https://leanstudio.asia/terms-of-use) and Privacy Policy (https://leanstudio.asia/privacy-policy). Premium features require in-app purchase subscription. Pricing may vary by location. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period.
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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
React Navigation
axios
react-native-maps
expo-location
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.
