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.
Stop guessing whether the cheaper pump down the road is actually worth the drive
$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 FuelSaverUK: Petrol Diesel EV: 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 fuel station data availability
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface may feel cluttered
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of personalization options
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.
Stop guessing whether the cheaper pump down the road is actually worth the drive. FuelSaver shows you the true cost per litre (or per kWh) with the cost of the detour already factored in. WHY FUELSAVER IS DIFFERENT Most apps just show you a price. FuelSaver does the maths a driver actually cares about: how much will this fill-up really cost me, once I've burned petrol or used battery getting here and back? Tell us your car's model (or your car's MPG and tank size/EV's efficiency), pick a search radius, and FuelSaver ranks every nearby station and charger by their real, all-in cost, not just the headline price on the sign. PETROL & DIESEL • Live UK prices from the CMA's official open fuel-price feeds. Retailers are now required to provide this in the UK which ensures our data is up to date. • Covers Asda, Tesco, Sainsbury's, Morrisons, BP, Shell, Esso, Texaco, Jet, Applegreen and many more independents. • See pump price, distance, drive cost and the all-in true cost, plus how much you'd save versus your nearest station. • Choose petrol (E10), super unleaded (E5), diesel or premium diesel • Navigate straight from the app which will pass your chosen station to your default map application and start routing. EV CHARGING • Public charge points sourced from Open Charge Map, the world's largest open database of EV chargers. • Estimated pence-per-kWh for major UK networks so you can compare rapid, ultra-rapid and destination chargers like-for-like. • True cost per kWh includes the energy used driving there from your home charge so a "cheap" charger 12 miles away might actually cost more than the one round the corner. YOUR VEHICLE PROFILE • Save your car's model or custom MPG and tank size, or EV efficiency, battery size, home electricity rate and target charge level. • Switch between petrol/diesel and EV mode in a single tap if you run a mixed household. • Settings stay on your device with no account and no sign-up. SMART ROUTING • Optional road-distance mode uses real driving distances and estimated journey time. • Round-trip toggle only counts the journey home if you're actually going home afterwards. • Adjustable radius from 3 to 25 miles. PRIVACY-FIRST • No account required. Open the app and you're using it. • Your location is used only to find nearby stations and chargers, and is sent to our prices API solely to return nearby results. • No tracking, no advertising IDs, or third-party analytics. WHO IT'S FOR • Commuters who pass three pumps on the way to work and want to know which one is genuinely the cheapest. • EV drivers planning a top-up away from home. • Anyone running a car on a budget the few pence per litre add up to real money over a year. UK ONLY FuelSaver is built for the United Kingdom. Prices are in pence per litre, distances in miles, fuel economy in MPG (UK gallons), EV energy in kWh and tariffs in pence per kWh. GET STARTED 1. Open the app and allow location access. 2. Add your car (or EV) so the cost calculations are accurate. 3. Pick your fuel type or switch to EV mode. 4. See every nearby option ranked by true cost and how much you'd save by driving past your usual one.
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.