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
MTG Wrist Counter
MTG Wrist Counter is a simple application that will allow you to track the different counters that you use during a game of Magic the Gathering on your Apple Watch
$2.99 · In-app purchases
PRICE
$2.99
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 included14 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 MTG Wrist Counter: map the core Entertainment 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 feature to manage multiple game sessions.
Assumption to check: Users find it difficult to track multiple games simultaneously.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize colors and themes.
Assumption to check: Limited customization options for life displays.
Validate with people who use this workflow before building.
Hypothesis 3
Add functionality for users to share game results on social media.
Assumption to check: Lack of social sharing features.
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline game tracking with local storage.
Assumption to check: No offline capabilities.
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
MTG Wrist Counter is a simple application that will allow you to track the different counters that you use during a game of Magic the Gathering on your Apple Watch. We built MTG Wrist Counter with usability in mind to allow you to quickly and accurately track the multiple counters used in a game. MTG Wrist counter design is natural to use. You can easily and rapidly add modify the counters without unlocking your iPhone and waste its precious battery life. Track your default counters or even create new custom counters that will fit your need ! Here are the major features: - Track Life, poison, storm, energy, experience, commander tax counters ... - Create custom counters that will fit your need - Need a random coin flip feature ? We got it ! - Change the default settings for new games (number of players, starting Life) - Supports up to 4 players - Track counter history for all players And we did all this in a simple and quick to use design... All comments and reviews are welcome and we will gladly consider your suggestions in upcoming updates. Please send your feedback to [email protected]. This app is not produced, endorsed, supported or affiliated with Wizards of the Coast. Icon made by Freepik from www.flaticon.com Icon made by Alfredo Hernandez from www.flaticon.com Logo vector created by freepik - www.freepik.com
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
react-navigation
@react-native-async-storage/async-storage
react-native-paper
TypeScript
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.
