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.
How much did I spend on fuel this month and in the last 6 months?
$9.99 · 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 Fuel Tracker - Gas & Mileage: map the core Finance 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: Users often find it tedious to log every transaction manually.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficulty in analyzing spending trends over time.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customizable settings for fuel types and categories.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited notifications for reminders.
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.
How much did I spend on fuel this month and in the last 6 months? Is my monthly fuel spending average? Is my car's fuel consumption increasing? Is the cheapest fuel really the cheapest? When will the next maintenance be? Get instant answers to all these questions and more with the Fuel Tracker+ app. Record your refuelings in Fuel Tracker+ and get instant answers about car consumption, fuel efficiency, most economical fuels, monthly expenses, maintenance forecasts, and other information. Each answer is presented in charts and numerical tables. The charts have superpowers with filters and selectors that allow you to obtain different views with periods, vehicles, and fuels of your choice. Add as many vehicles as you want, and of different types: cars, trucks, motorcycles, and buses. Maintain a history of all refuelings with filters by vehicle, period, fuel type, fuel station, and payment method. 8 different types of charts with superpowers for you to analyze vehicles, refuelings, expenses, fuels, and fuel stations from all angles. Track fuel consumption trends by vehicle, fuel type, and fuel station. Record refuelings and the app will forecast vehicle maintenance. Syncs vehicles, refuelings and fuel stations across your devices and with family & friends (requires one time in app purchase). The app was designed with privacy in mind: no information you enter into the app, whether it's your vehicles, refuelings, or refueling locations, leaves the app. Everything stays within your device, in private. We take privacy so seriously that the app does not require account creation, meaning there's no way to associate your data with an email or phone number. That's why the app is paid: we don't sell your data in exchange for advertising. Terms of use (End User License Agreement): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
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.