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
Submarines of the US Navy
SUBMARINES of the US NAVY features more than 700 high-resolution photos
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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's included16 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 Submarines of the US Navy: map the core Reference 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
Add quizzes or trivia related to submarines.
Assumption to check: Limited interactive features for users
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate videos or audio narrations.
Assumption to check: Lack of multimedia content
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to submit their own submarine experiences.
Assumption to check: No user contributions or comments
Validate with people who use this workflow before building.
Hypothesis 4
Implement a news section for submarine-related updates.
Assumption to check: Static information updates
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
SUBMARINES of the US NAVY features more than 700 high-resolution photos. All photos take advantage of the iPad's ability to allow you to zoom in and examine the images in minute detail. In addition to an authoritative history of each submarine, our app includes complete specs on every submarine commissioned between 1900 and 2009. Over 700 submarines are listed in total, with histories and hi-res photos, all of which an be exported and reused. Each hi-resolution photo has an optional caption that describes the circumstances under which the photo was captured. * Thousands of facts in 700 articles, plus 700 hi-res photos. * The ideal way to learn about US Submarines. * Especially designed for iPad usage, allowing display of photographic detail. * Official US Navy photographs with optional captions. * Completely self-contained- no Internet connection necessary. * Photos can be printed or shared with others. The app includes one-touch icons to return to the table of contents; go back to recently viewed pages; and to access the list of user selected favorites. Submarines of the US Navy is the fifth of a series of apps on the US Navy for the iPad, iPhone, and iPod touch MultiEducator plans to release in the coming year.
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
Zustand
react-navigation
axios
expo-image
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.
