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
CityGuide - Walking Audio Tour
City Guide turns your phone into a personal tour guide, in every city you visit.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
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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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 CityGuide - Walking Audio Tour: 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 local caching for offline playback.
Assumption to check: Limited offline access to audio files
Validate with people who use this workflow before building.
Hypothesis 2
Integrate a robust review system to enhance credibility.
Assumption to check: Lack of user reviews and ratings
Validate with people who use this workflow before building.
Hypothesis 3
Improve search functionality with advanced filters.
Assumption to check: Difficulty in finding specific tours
Validate with people who use this workflow before building.
Hypothesis 4
Add more payment methods and subscription tiers.
Assumption to check: Limited payment options for in-app purchases
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
City Guide turns your phone into a personal tour guide, in every city you visit. An all-in-one travel app that lets you explore freely while enjoying a smart audio guide - up to 20x cheaper than a classic guided tour. Explore every city at your own pace, as if you had a local guide by your side - no group, no schedule, no internet connection. Visit Paris, London, Rome, Barcelona, Madrid, Venice... and over 500 cities. ---------------------- HOW DOES IT WORK? ---------------------- Open the app, start the guide and begin walking. As soon as you get close to a point of interest, the audio plays automatically. No more searching, tapping or reading. ---------------------- WHAT'S INCLUDED ---------------------- - Thousands of narrated points of interest (landmarks, museums, neighborhoods, hidden gems) - Themed audio walking tours to explore every neighborhood - A smart map with proximity alerts - Full offline access - works in airplane mode - Local restaurant recommendations, far from tourist traps - A trip planner that builds an optimized route based on what you want to see - A virtual assistant to answer your questions in real time ---------------------- WHY CHOOSE CITY GUIDE? ---------------------- Unlike traditional guides: - no reading - no tapping - no searching everything plays automatically ---------------------- PERFECT FOR ---------------------- - Travelers - City trips - Curious tourists - Urban explorers Try it now. Download City Guide and rediscover the way you visit a city. Available cities: Rome Guide / Visit Rome / Rome Audio Guide Paris AI Guide / Things to do in Paris / What to see in Paris London Guided Tour / Discover London / City trip to London Barcelona Travel Guide / Barcelona Walking Tour / Visit Barcelona Venice Audio Tour / Venice Guide / Visit Venice Florence Audio Guide / Florence AI Guide / Things to do in Florence What to see in Amsterdam / Amsterdam Guided Tour / Discover Amsterdam City trip to Madrid / Madrid Travel Guide / Madrid Walking Tour Visit Prague / Prague Audio Tour / Prague Guide Visit Vienna / Vienna Audio Guide / Vienna AI Guide Things to do in Lisbon / What to see in Lisbon / Lisbon Guided Tour Discover Berlin / City trip to Berlin / Berlin Travel Guide Milan Walking Tour / Visit Milan / Milan Audio Tour Athens Guide / Visit Athens / Athens Audio Guide Budapest AI Guide / Things to do in Budapest / What to see in Budapest Dublin Guided Tour / Discover Dublin / City trip to Dublin Munich Travel Guide / Munich Walking Tour / Visit Munich Istanbul Audio Tour / Istanbul Guide / Visit Istanbul New York Audio Guide / New York AI Guide / Things to do in New York What to see in Tokyo / Tokyo Guided Tour / Discover Tokyo City trip to Dubai / Dubai Travel Guide / Dubai Walking Tour Visit Marrakech / Marrakech Audio Tour / Marrakech Guide Visit Edinburgh / Edinburgh Audio Guide / Edinburgh AI Guide Things to do in Seville / What to see in Seville / Seville Guided Tour Discover Naples / City trip to Naples / Naples Travel Guide
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 Navigation
Expo AV
Supabase
Zustand
React Native
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.
