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.
Cash4Gas is your Best Travel Companion for Calculating Fuel Costs and Vehicle Ranges
$0.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Cash4Gas: 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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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
Assumption to check: Limited search filters for gas prices.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of user reviews for gas stations.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No map feature to visualize gas station locations.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases may be unclear to users.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Cash4Gas is your Best Travel Companion for Calculating Fuel Costs and Vehicle Ranges Quickly and Easily Convert ANY Fuel Price into Trip Cost and Cost per Mile -> Calculate or Check Fuel Economy by Tapping on the "Cash4Gas" Logo -> Now with Support for making Electric Vehicle Comparisons!~ Find TRIP Distance & REVERSE ADDRESS using the MAP Feature -> POPULATE TextFields via the "CALC" Button Effortlessly Toggle Between One Way and Round Trip (TwoWay) with just the Touch of a Button! Adjust Direct As-the-Crow-Flies Shortest Possible Distance Data for TWISTY Roads & Impediments of TERRAIN -> with +0% / +5% / +10% / +15% / +20% / +25% / +30% / +35% / +40% / +45% Automatic Offset Review your Previous Calculations like a QB reviewing Game Tape by using the upper right hand Mahjong Tile Button The Previous 16 Calculations are now at your fingertips.....its so Easy! Whether purchasing Gallons of Gas in Miami, or Liters of Gas for a Scooter in Saigon using Vietnamese Dong .....Cash4Gas has your Back!! Just enter Fuel Price and Trip Distance to Calculate an entire Table of Trip Costs. Add Gas Tank Size and Fuel Economy to Calculate the Specific Costs of your Vehicle. Press the Calculate Button to Build a New Fuel Costs Data Table Press the Reset Button to Clear all the Fields for a New Entry -NEW FEATURE -> Cash4Gas Fuel Stop PICS Library **Quickly Take & Import Photos of Gas Pump or SuperCharger Information & Vehicle Odometer Readings for Fuel Economy COST Analysis -> right from Cash4Gas!~ ***Finding OLD PHOTOS for Fuel Economy Estimating & Cost Comparison is a Breeze w/ Fuel Stop PICS Library!! -Fuel Economy Calculator Includes Total FUEL COST / Fuel-Up NOTES / & Odometer MILEAGE Readings **Calculate FUEL Economy & even kWh using -> Trip Distance / Fuel Quantity / & Fuel Cost!~ To Calculate FUEL ECONOMY from Photos: [Press MENU Button] -> [Navigate to Relevant PHOTOS] -> [Select FUEL ECONOMY CALCULATOR] -> [Enter FUEL STOP DATA] or [Scroll Down to Select ODOMETER] -> [Tap Background to SAVE Current Progress] -> [Press CLOSE to Return to PHOTO Review as Necessary] -> [Press CALCULATE before Pressing SAVE Button] or [Press CLOSE to Exit] ***Calculate TRIP DISTANCE using ODOMETER Mileage Calculator ****Create Instant NOTES & Update the Current Cash4Gas Trip Fuel Cost CALCULATION by Pressing SAVE Button -> FUEL Economy Details are STORED for Easy Review in Fuel Economy NOTES -Use MENU Button -> for Navigating to Fuel Stop PICS Library -Use FUEL PUMP Emoji Button -> FAST Navigation to "Calculate Fuel Economy" Screen -Added CAMERA Emoji Button -> FAST Navigation to Camera & Fuel Stop PICS Library -NOTES Fuel Economy Feature -> Automatically Updates FUEL STOP Economy Notes when CLOSE NOTES or SAVE Buttons are Pressed **NEW NOTES appear at the Top of NOTES Page -> Modify NOTES Directly Using the KEYBOARD to ADD or DELETE Fuel Economy Information to Access NOTES: [Press MENU] -> [Scroll Down to FUEL ECONOMY CALCULATOR] -> [Press NOTES] *Tapping on Cash4Gas Title Label also Directly Opens NOTES Feature Calculate Values in the Units of any Major Global Fuel Economy Standard Whether MPG.....L / 100km......km / L......or even MPG UK (Imperial Gallons)......Cash4Gas has you covered See the Fuel Economy and Fuel Capacity of your Vehicle in Global Units......now you can Relax when Crossing that Foreign Border! With Cash4Gas now you can Rest Easy at the Gas Pump. Cash4Gas, Travel Like a Boss!! *Works on iPhone and iPad
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.