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
Fuelly: MPG & Service Tracker
Easily track your vehicle’s fuel economy and vehicle maintenance records
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
29,667 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 Fuelly: MPG & Service Tracker: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Easily track your vehicle’s fuel economy and vehicle maintenance records. Set up reminders to keep on top of maintenance tasks such as oil changes and tire rotations. Fuelly makes it easy for you to save money with gas mileage calculations (MPG) and service reminders. The Fuelly app seamlessly integrates with Fuelly.com, the web’s most used gas mileage tracking website. Easily manage the cars in your garage and log each fuel-up. At each fuel-up, just add the miles, gallons and price per gallon and see your MPG data grow. All data is beautifully displayed and perfectly synchronized with your vehicle on Fuelly.com Features: • Tracks gas mileage and vehicle maintenance • Attachments to store photos and PDFs • Online sync to Fuelly.com • Charts: MPG, stats, gas price, gas expenses, service expenses • Customizable service reminders, with presets like oil changes, tire rotations, and more • Priority support via in app messaging • Supports multiple vehicles • Store vehicle data: VIN, License Plate, etc. • Excel compatible email reports (CSV attachment) • International Units: MPG (US), MPG (Canada), MPG (UK), MPG (Imperial), L/100km, gal/100mi (US), gal/100mi (Imperial), km/L, km/gal (US), km/gal (Imperial), and mi/L "App Store Pick of the Week." —Apple "Gas Cubby makes its mark not only with its power, but with its flexibility." —Kyle Baxter - Macworld For more information visit: www.Fuelly.com For priority support, contact us via in app messaging. Or you can contact us at [email protected] --- Also available from Fuelly: FUELLY PREMIUM • Remove ads • Add photos and PDFs to records • Auto completion of locations when adding fuel or services --- Price may vary by location. Subscriptions will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. You will not be able to cancel the subscription once activated. Manage your subscriptions in Account Settings after purchase. --- Privacy Policy: http://www.fuelly.com/privacy Terms of Service: http://www.fuelly.com/terms
Written user reviews are not shown here. Check current App Store reviews >
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
Enhance tracking with advanced analytics and custom reminders.
Assumption to check: Limited vehicle tracking features compared to competition
Validate with people who use this workflow before building.
Hypothesis 2
Implement better data synchronization methods.
Assumption to check: Occasional syncing issues with vehicle data
Validate with people who use this workflow before building.
Hypothesis 3
Provide clearer explanations for premium features and benefits.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 4
Modernize the design and improve user engagement.
Assumption to check: Basic UI/UX may feel outdated
Validate with people who use this workflow before building.
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 Native
Expo
Zustand
Axios
React Navigation
@react-native-community/picker
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.
