App Overview

MJWinLog icon

MJWinLog

Jeffrey Tam · Utilities

MJWinLog — Track Your Winning Hands

$1.99 · In-app purchases

PRICE
$1.99
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.

Build your own version

Build Kit

Make this idea yours

A product spec, screen plans, and build steps for your coding agent.

First kit free with a verified email

Add to a Remix

Combine features and design from your favorite apps.

Kit ready. Verify your email to download it.

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/
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.

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.

JavaScript is required to complete mailbox verification.

Free quick prompt For a smaller starting point

Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for MJWinLog: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

Preview ready. Verify your email to reveal and copy the full prompt.

JavaScript is required to complete mailbox verification. Return to this prompt preview.

Continue in Rork copies the full prompt to your clipboard first, then opens Rork in a new tab.

Continue in Rork >

Affiliate link: CloneChart may earn a commission at no extra cost

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 feedback mechanism for users to share their experience.

Assumption to check: Lack of user reviews and feedback

Validate with people who use this workflow before building.

Hypothesis 2

Add advanced analytics and sharing options for wins.

Assumption to check: Limited features compared to competitors

Validate with people who use this workflow before building.

Hypothesis 3

Introduce options for logging recurring wins automatically.

Assumption to check: No recurring win logging feature

Validate with people who use this workflow before building.

Hypothesis 4

Revamp the UI with modern design principles and animations.

Assumption to check: User interface might feel outdated

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

MJWinLog — Track Your Winning Hands Every serious American mahjong player has wondered: which hands do I actually win with? Track your own game — or keep stats for your whole table. MJWinLog gives you the answer. Log each winning hand in seconds, build up your history, and let your stats show you the patterns you reach most often — and the ones worth chasing. Log Any Way You Like Enter a pattern code directly if you know it — MJWinLog looks it up instantly and shows you the full hand, section, and point value. Start typing and suggestions appear as you go, so you're never hunting. Prefer to work from the tiles themselves? Type the pattern manually. MJWinLog will match it to a known hand automatically, or offer close alternatives if it isn't an exact fit. Stats That Actually Mean Something After a few sessions, your Stats tab starts to tell a real story: By Pattern — see every hand you've won, ranked by frequency, with a visual breakdown of how often each one appears in your history By Section — find out which parts of the card you gravitate toward, and which ones you barely touch Win count, unique hands, total value — a quick summary of your overall record at a glance The more you log, the clearer the picture becomes. Built for Real Play MJWinLog is designed to be fast enough to use right at the table. Logging a hand takes seconds — tap in a code, confirm the match, done. No fuss, no clutter. Supports multiple players — each person logs their own hands, so everyone at the table can see who's winning what. Clean, readable typography for tile patterns. Everything built around the way mahjong players actually think about their hands. Whether you play casually with friends or competitively, MJWinLog helps you understand your game like never before. Download and start logging today.

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

< Scroll to see more >

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
@react-native-picker/picker
react-native-datepicker
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.