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.
MJWinLog — Track Your Winning Hands
$1.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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.
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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
Assumption to check: Lack of user reviews and feedback
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No recurring win logging feature
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: User interface might feel outdated
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
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 >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.