App Overview

MahWins: Mahjong Game Tracker icon

MahWins: Mahjong Game Tracker

John Haas · Lifestyle

MahWins is a game and score tracker for American Mahjong

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
13 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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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.

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.

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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// RORK SYSTEM PROMPT
Rork plan preview for MahWins: Mahjong Game Tracker: map the core Lifestyle 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

Competitive pricing with generous free tier

Assumption to check: Expensive subscription

Validate with people who use this workflow before building.

Hypothesis 2

Focus on most-requested features first

Assumption to check: Missing features

Validate with people who use this workflow before building.

Hypothesis 3

Optimize for 60fps, fast load times

Assumption to check: Poor performance

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

MahWins is a game and score tracker for American Mahjong. It records the games your group plays so you can look back later and see who won what hand, and if your table plays for points, it does the math for you. Logging a win takes just a few taps. ▸ HOW LOGGING WORKS Pick the winner, tap the line they won on, mark self draw or off a discard, and you're done. Playing another hand with the same table? One tap brings back the same players. People you play with often show up as quick chips, including guests who don't have the app. You can add a photo of the tiles or a quick note if you want. ▸ SCORING AND SEASONS If your group plays for points, turn on score tracking. Every game is totaled automatically: base points for the hand, self draw and jokerless bonuses, penalties, all of it. The group leaderboard updates itself, so there's never a question about who's ahead. Run it in seasons: crown a champion, keep every past season on the board, and start the next one fresh. Groups that play just for fun can leave scoring off and never see it. ▸ TWO-PLAYER MODE Only two people tonight? Still counts. Two-Player Mode logs the game with both of the winner's hands recorded. ▸ PHOTOS AND WIN CARDS Snap a photo of the winning tiles and it saves with the game. Photos from your group pile up in a shared feed you can scroll through later, and any photo can be saved to your phone. You can also turn a win into a card to share with people who weren't at the table. ▸ STATS Stats build up the more you log. Win rate per player, who beats whom, the hands that come up most for each person, your best section, and how much of the card you've won across. Tap any player to see their full record. After a few months you have the kind of records people used to keep on a legal pad. ▸ GROUPS AND FRIENDS Make a group for your weekly crew. Members see the shared history and can comment on individual games. New people can join by scanning a QR code or tapping a shared link. You can also add friends one on one outside of a group. There's a privacy setting per user that controls who sees your stats. ▸ NOTIFICATIONS Push notifications are kept simple. You get one when a friend logs a win, when you're invited to a group, or when you're tagged in a game someone else logged. ▸ PRIVACY No analytics. No crash reporters. No ads. We don't sell your data and we don't use it to train AI. We don't track you across other apps. Sign in with Apple and Sign in with Google both work. Apple Private Relay is supported. You can delete your account anytime from Settings. ▸ WHO IT'S FOR MahWins is built for people who play American Mahjong in person, whether your table plays for points or just for bragging rights. If that's you, give it a try. Have feedback? [email protected]. We read every message.

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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
RevenueCat
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.