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
GasBuddy: Find & Pay for Gas
Wherever you go, GasBuddy® helps you fuel up for less while rewarding you with savings that go beyond the pump
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
447,812 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 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 GasBuddy: Find & Pay for Gas: 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 a user verification system for gas prices.
Assumption to check: Users report inaccurate gas prices at times.
Validate with people who use this workflow before building.
Hypothesis 2
Add more payment integrations (e.g., PayPal, Apple Pay).
Assumption to check: Limited payment options available.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize search algorithms for faster results.
Assumption to check: Some users find the search feature slow.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance stability during transactions and improve error handling.
Assumption to check: User feedback on app crashes during payment.
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
Wherever you go, GasBuddy® helps you fuel up for less while rewarding you with savings that go beyond the pump. With over 100 million downloads and 25 years of saving drivers more on fuel, the GasBuddy app is a trusted source for value-seeking drivers, helping you save the most on every fill-up while you shop, snap, and game your way to bigger savings. Find the Best Gas Prices at Any Station Our community is powered by drivers like you! We rely on GasBuddies to find and report gas prices. Search for any type of fuel and sort by price, location, or amenities like restrooms, restaurants, and more. When you report a price or review a station, you help other drivers find the best places to fuel up. That makes planning road trips and sticking to a budget much easier. GasBuddy Rewards: Snap & game your way to more savings! Saving is a destination. Where will you go today? Get rewarded with points for snapping receipts, playing games, and finding deals as part of your daily routine. Points can be redeemed in the app for cents-per-gallon discounts at the pump or for digital cards from top retailers. Think of GasBuddy Rewards points as the fuel for your next savings adventure. In addition, Pay with GasBuddy+™ members and Premium members can earn even more points through special offers and promotions. Activate a Flash Deal before filling up to save even more at the pump! Before every fill-up, find a station with a Flash Deal banner and tap to activate the additional pump savings. Track your fuel usage and stay up to date on vehicle recalls for added safety. You can also map road trips to view gas prices along your route. Not a Pay with GasBuddy+™ member? You can still earn up to 250 points/gal on activated Flash Deals when you fill up and upload your receipt. Save more at the pump with Pay with GasBuddy+™ Unlock greater savings for life's journeys. Members enjoy everyday fuel savings of at least 3¢/gal* guaranteed, and 5¢/gal* at select stations, with potential savings up to 33¢/gal* with an activated Flash Deal. Pay at the pump or inside the convenience store at stations nationwide, everywhere Mastercard® is accepted. PLUS, earn additional fuel savings on non-fuel purchases when you shop inside the convenience store. *Terms apply. Visit http://www.gasbuddy.com/pay for more information. The Pay with GasBuddy+™ card is issued by Fifth Third Bank, National Association, Member FDIC, pursuant to license by Mastercard International. Mastercard and the circles design are registered trademarks of Mastercard International Incorporated. See cardholder agreement for more information. GasBuddy uses gas price information provided by our users to bring drivers together to support the common goal of saving money on gas. Gas prices only for USA & Canada.
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.
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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.
