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
Gettysburg Audio Tour
The battle of Gettysburg was the largest and deadliest single battle ever fought in the western hemisphere
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
5 ratings · Top 30%
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.
Build your own version
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 included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Gettysburg 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
Expand audio library with more tours and locations.
Assumption to check: Limited audio content and tour options.
Validate with people who use this workflow before building.
Hypothesis 2
Implement clearer navigation pathways and user-guided tours.
Assumption to check: Difficult navigation and poor user flow.
Validate with people who use this workflow before building.
Hypothesis 3
Ensure higher audio production standards for all tours.
Assumption to check: Inconsistent audio quality.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce user reviews and ratings for tours.
Assumption to check: Lack of user engagement features.
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
The battle of Gettysburg was the largest and deadliest single battle ever fought in the western hemisphere. Now experience it like never before with the Gettysburg Audio Tour. Follow the tour in a customized map of the Gettysburg national park auto tour as you listen to over 1 1/2 hours of narration and sound effects telling the story of the 3 day battle. With 17 audio stops, this tour provides you and your family with what you need to learn about one of the most important events in United States History. The app is easy to use. Begin at the Gettysburg visitor center. Follow the tour on the map, or use the provided list tour stops to navigate the official tour. You can even follow the tour with a free map provided at the visitor’s center. Tap play and let the tour stop audio play all the way through. When complete, the next tour stop automatically loads in the player. Drive to the next tour stop and tap play again. It’s that simple. If you need directions, a button will open Apple’s map application and provide directions from your location to the next tour stop from wherever you are. Why buy an expensive CD at the visitor center that you will have to store and never use again? The Gettysburg Audio Tour is like having a personal guide right in your car. Look no further as you have found the only thing you need to experience the Gettysburg battlefield.
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
Axios
Zustand
React Native Maps
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.
