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
Yandex Metro
Plan your metro trip in Russia, Belarus, Ukraine and Uzbekistan and know how long your journey will take, including any line transfers
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
761 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/
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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 Yandex Metro: map the core Navigation 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 an interactive map with real-time updates and clear routing.
Assumption to check: Users find navigation confusing in complex subway systems.
Validate with people who use this workflow before building.
Hypothesis 2
Provide transparent subscription benefits and a clear paywall.
Assumption to check: In-app purchases can be unclear and frustrating.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize app performance and conduct thorough testing.
Assumption to check: Some users experience crashes or lagging.
Validate with people who use this workflow before building.
Hypothesis 4
Add offline maps and station information for better usability.
Assumption to check: Limited offline functionality.
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
Plan your metro trip in Russia, Belarus, Ukraine and Uzbekistan and know how long your journey will take, including any line transfers. The app displays the optimal route, shows which metro car will be most convenient, shows station exits on the map and forewarns of any closures. • Metro map with everything you need to know On the map you can see which stations are closed for repairs, and which stations are best for getting to railway stations and airports. Enlarge the map to see more detail, like different types of interchanges between stations. • Optimal routes and metro cars for convenient transfers Yandex Metro shows you how long a journey will take, the number of transfers and whether any stations are closed for renovations. It shows which metro car to choose to speed up your trip and not waste time when changing lines. Information about metro exits • Information about metro exits See detailed information about every station: how many exits and which streets they lead to, working hours and warnings of any closures. Hail a taxi to pick you up from your chosen metro exit right within the app. • Pay your fare in the app Use the app to top up Moscow’s Troika and Strelka public transport cards. • Accessibility The app supports VoiceOver, so it can be used by people with visual impairments. • More than 20 schemes – Russia: Volgograd, Yekaterinburg, Kazan, Moscow, Nizhny Novgorod, Novosibirsk, Samara, St. Petersburg. - Austria: Vienna. - Azerbaijan: Baku. - Armenia: Yerevan. - Belarus: Minsk. - Hungary: Budapest. - Greece: Athens. - Georgia: Tbilisi. - Italy: Milan, Rome. - Kazakhstan: Almaty. - UAE: Dubai. - Poland: Warsaw. - Portugal: Lisbon. - USA: San Francisco. - Turkey: Istanbul, Izmir, Adana, Bursa, Ankara. - Uzbekistan: Tashkent. - Ukraine: Dnipro, Kiev, Kharkiv. - Sweden: Stockholm. - Finland: Helsinki. - Czech Republic: Prague.
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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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
react-navigation
react-native-maps
BUILD KIT DIFFICULTY
Advanced
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.
