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
Watch Keeper - Collectors Box
Watch Keeper is a digital collection manager for watch collectors.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
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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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 Watch Keeper - Collectors Box: map the core Shopping 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
Offer advanced categorization and tagging options for watches.
Assumption to check: Limited organization features for collections
Validate with people who use this workflow before building.
Hypothesis 2
Include options to share collections on social media.
Assumption to check: No social sharing capabilities
Validate with people who use this workflow before building.
Hypothesis 3
Provide value tracking and historical price data for watches.
Assumption to check: Lack of analytics for watch value tracking
Validate with people who use this workflow before building.
Hypothesis 4
Implement a cleaner, more minimalistic design approach.
Assumption to check: User interface may be cluttered
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
Watch Keeper is a digital collection manager for watch collectors. Build a detailed record of every watch you own. Whether your collection includes Rolex, Omega, Seiko, Tudor, TAG Heuer, Cartier, Breitling, Longines, Grand Seiko, Casio, or independent microbrands, Watch Keeper helps you keep every detail organized in one private digital watch box. Save photos, serial numbers, purchase details, current values, insured values, condition ratings, service notes, YouTube videos, and personal notes in one place. Use Watch Keeper to understand your collection at a glance: total value, watches owned, service queue, wear count, condition, and collection health. It is designed to help collectors stay organized, protect important details, and maintain useful records for insurance, service, resale, or personal reference. Whether your collection is just beginning or already growing, Watch Keeper gives you a clean digital watch box for iPhone and iPad. Features include: Watch collection catalog Photos, notes, specs, and serial numbers Purchase price, current value, and insured value Condition ratings for dial, crystal, bracelet, case, and movement Wear count tracking Service and maintenance tracking YouTube video references Brand and value insights Collection health overview Currency conversion Custom app themes iPhone and iPad support Organize your watches. Track their value. Keep every detail safe. For App Store safety, I would add a small disclaimer at the bottom: Watch Keeper is an independent app and is not affiliated with, endorsed by, or sponsored by any watch brand mentioned.
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
Zustand
react-navigation
expo-image-picker
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.
