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
Philadelphia History Tour
Philadelphia: the birthplace of Betsy Ross, the Declaration of Independence, and American history
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
27 ratings · Top 5%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 Philadelphia History 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 a real-time update system for tours.
Assumption to check: Tour information can be outdated or inaccurate.
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing options to engage users.
Assumption to check: Limited user engagement features (e.g., social sharing).
Validate with people who use this workflow before building.
Hypothesis 3
Enhance map functionality with better filters and labels.
Assumption to check: Difficulties in navigating between tours on the map.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate a feedback system for continuous improvement.
Assumption to check: No user feedback mechanism for tours.
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
Philadelphia: the birthplace of Betsy Ross, the Declaration of Independence, and American history. Our narrated guide is the perfect companion for walking around Philadelphia’s historic downtown - it's full of interesting facts, easy to use, and complete with maps and travel tips. This travel guide covers 16 of the most historic sites in all of America, from the Liberty Bell and Independence Hall to Franklin court. At 3.4 miles, it is a bit of a walk — maybe take a break to grab lunch or explore a favorite site. No schedules, no crowds, no worries. All Two Buck Tours include maps with GPS and a recommended route, walking directions, photos, text, and English narration. It’s like having your own personal tour guide, at a fraction of the price. Not visiting anytime soon? The history and photos will give you a taste of the city. Perfect for visitors and locals of all ages.
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
Expo
Supabase
react-navigation
expo-location
@supabase/supabase-js
BUILD KIT DIFFICULTY
Starter
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.
