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
GasMap Iceland
Gas in Iceland is a rip-off — if you don't know where to look.
$3.99
PRICE
$3.99
No 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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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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 GasMap Iceland: 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
Show total price upfront including all fees
Assumption to check: Hidden fees revealed at checkout
Validate with people who use this workflow before building.
Hypothesis 2
In-app chat with fast response times
Assumption to check: Poor customer support
Validate with people who use this workflow before building.
Hypothesis 3
3-step booking with clear progress
Assumption to check: Complicated booking process
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
Gas in Iceland is a rip-off — if you don't know where to look. Prices for the SAME fuel vary by 15% across the island. On a 1,300 km Ring Road trip, that's real money. GasMap Iceland turns every gas station on the island into a color-coded money-saving map. GREEN = cheap. RED = rip-off. One glance, and you know exactly where to fill up. ◆ LIVE PRICE MAP — 245 stations, updated hourly. N1, Olís, ÓB, Orkan, Atlantsolía, Costco — all of them, color-coded by how much they'll hurt your wallet. ◆ CHEAPEST NEAR YOU — Instantly see the 3 cheapest stations within 50 km. Sometimes a 5-minute detour pays for your coffee. Sometimes your lunch. ◆ PETROL OR DIESEL — Driving a diesel rental? One tap re-colors the entire map for diesel prices. ◆ AURORA FORECAST — Tonight's northern lights probability as one big number, plus the clearest region to drive to. KP index, cloud cover, 3-day outlook. No science degree needed. ◆ WEATHER + CURRENCY — Real conditions for 6 regions, 3-day forecasts, and a live ISK converter so you actually know what you're paying. Built by people who drive Iceland, for people who drive Iceland. One fill-up at the wrong station costs more than this app. GasMap Iceland — drive smart, pay less, see the lights.
Written user reviews are not shown here. Check current App Store reviews >
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.
SUGGESTED BUILD STACK
React Native
Mapbox
Stripe
Supabase
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.
