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
Fuel Rewards® program
For a limited time, all Fuel Rewards members receive instant Gold Status.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
682,597 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 included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Fuel Rewards® program: map the core Shopping 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 map view to show locations visually.
Assumption to check: Users report difficulty in finding nearby locations
Validate with people who use this workflow before building.
Hypothesis 2
Add more filter categories for easier navigation.
Assumption to check: Limited filtering options for rewards
Validate with people who use this workflow before building.
Hypothesis 3
Provide clearer explanations and a guided walkthrough for purchases.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Integrate a chat feature for real-time support.
Assumption to check: Customer service response times are slow
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
For a limited time, all Fuel Rewards members receive instant Gold Status. The Fuel Rewards® program (aka Fuel Rewards Network or FRN), is a free loyalty program that helps you save money on fuel at over 11,000 Shell stations, nationwide. Fuel Rewards members with Gold Status save at least 5¢gal on every fill-up. You can earn additional Fuel Rewards savings when you shop, dine, book travel and more. Rewards are cumulative, and there is no limit to how much you can save. Rewards apply to any fill-up, up to 20 gallons. APP FEATURES • Track rewards balance, current tier, & tier progress • Activate offers • Link Credit & Debit cards for earning (always use as credit) • Opt Credit & Debit cards in to allow faster redemption and fueling • Find ways to earn rewards • Locate nearby Shell stations WAYS TO EARN REWARDS At Shell: With Gold Status, you’ll save at least 5¢/gal on every fill-up at participating Shell stations. Also, you can earn rewards at select Shell stations when you purchase snacks, beverages, car washes and more. Dine: Earn 10¢/gal for every $50 you spend dining with a linked Mastercard, Visa, or American Express at more than 10,000 participating restaurants nationwide. Shop: Earn at least 5¢/gal for every $50 you spend at select local and online merchants. Travel: Earn 5¢/gal for every $50 spent when you book hotels, flights and rental cars, through the Fuel Rewards program. With Mastercard: Look for exclusive offers from Mastercard to accelerate your savings. More: Find additional promotions at select regional grocery stores, other affiliated programs, and online at fuelrewards.com. Some offers must be activated prior to earning. Use the mobile app to easily activate these offers. HOW TO SAVE AT THE PUMP • Use the app to find a participating Shell or other participating fuel stations. • Enter your ALT ID (or swipe your Fuel Rewards loyalty card) at the pump before you pay • Watch the price roll back. Shell is the official fuel provider of the Fuel Rewards program. Participation varies by market. Mastercard is the preferred payment card of the Fuel Rewards program.
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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 Navigation
Zustand
Axios
Expo Location
React Native Reanimated
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.
