App Overview

FuelSaverUK: Petrol Diesel EV icon

FuelSaverUK: Petrol Diesel EV

Lewis Sugden · Travel

Stop guessing whether the cheaper pump down the road is actually worth the drive

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

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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What's included16 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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
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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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

Implement a crowdsourcing feature for users to add and update station information

Assumption to check: Limited fuel station data availability

Validate with people who use this workflow before building.

Hypothesis 2

Focus on minimalistic design and easy navigation to enhance user experience

Assumption to check: User interface may feel cluttered

Validate with people who use this workflow before building.

Hypothesis 3

Clarify subscription benefits and make premium features more appealing

Assumption to check: In-app purchase confusion

Validate with people who use this workflow before building.

Hypothesis 4

Allow users to customize their fuel preference settings and notifications

Assumption to check: Lack of personalization options

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

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.

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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
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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.