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 Check Manager
Faster than an E6B, this Fuel Manager reduces the time it takes to do fuel check calculations to just a few seconds
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.6
7 ratings · Top 50%
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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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/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Fuel Check Manager: map the core Productivity 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
Add more analytics and insights on fuel spending.
Assumption to check: Limited features for tracking fuel expenses
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud storage for user data.
Assumption to check: No cloud sync or backup options
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI with themes and personalization options.
Assumption to check: Basic UI with minimal customization
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the purchase process and clarify benefits.
Assumption to check: In-app purchases can be confusing
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
Faster than an E6B, this Fuel Manager reduces the time it takes to do fuel check calculations to just a few seconds. It also calculates your flight time and has Apple Watch Support. Features an intuitive and efficient interface. Download now to improve your cockpit workflow! Three functions in one app. Fuel Check Calculator - Large print stopwatch for quick glances on lapsed time - Custom large numeric keypad for quick fuel entry - Calculates Burn Rate and Burnout time. - Calculates 3 Fuel Reserve times for Rotary & Fixed Wing IFR/VFR flights - 15-minute fuel check reminder notifications - Supports Landscape and Portrait mode for iPad devices Flight Time Calculator - Keep track of flight leg times in 10ths of an hour FLYT Time for Apple Watch - Minimally designed with single button action - Apple watch version of the Flight Time Calculator - Includes 15-minute fuel check notifications The Details Fuel Check Calculator Start by entering your beginning fuel number. Then, press the triangle button to start the timer. Once you are ready to calculate your Burn Rate and Reserve times, enter the ending fuel number then hit the "=" button to see the results. If you forget to close out your fuel check, no worries, the app will send a notification to your device (iPad, iPhone, or Apple Watch) after 15 minutes of starting your fuel check. To see the details of the calculation, tap on the center of the screen to display the detail window. Press the center of the display window to return to the main screen. To use the Flight Time calculator, press the "Lift Off" toggle switch to start and press it once more when you want to stop the clock and calculate the time in tenths of an hour. For example, 2.5 will mean two and a half hours. Swipe the sides of the app upward to view the manual calculation page. FLYT Time for Apple Watch Click the "Start" button to start the timer. When you're ready, press "Stop". FLYT Time will automatically calculate and display your flight time in tenths of an hour. For example, 1.5 means an hour and a half.
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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.
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BUILD KIT DIFFICULTY
Starter
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.
