App Overview

Lineup Assistant icon

Lineup Assistant

Brian Harper · Sports

Every youth baseball and softball coach knows the challenges of setting up the best possible lineup each inning - while still conforming to all the intricate league rules...plus the difficulties dealing with last minu...

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
2.2
4 ratings · Below Average

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

// RORK SYSTEM PROMPT
Rork plan preview for Lineup Assistant: map the core Sports 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

Create a community-driven database where users can add and share players.

Assumption to check: Limited player database leading to incomplete lineups.

Validate with people who use this workflow before building.

Hypothesis 2

Implement a more modern and user-friendly design with clear guidance.

Assumption to check: Poor user interface leading to confusion.

Validate with people who use this workflow before building.

Hypothesis 3

Provide transparent information about pricing and features.

Assumption to check: Subscription model not clearly communicated.

Validate with people who use this workflow before building.

Hypothesis 4

Optimize app performance for handling larger data sets.

Assumption to check: Performance issues with larger lineups.

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

Every youth baseball and softball coach knows the challenges of setting up the best possible lineup each inning - while still conforming to all the intricate league rules...plus the difficulties dealing with last minute absentees! Lineup Assistant was designed by coaches for coaches to save you those hours each game and help you focus on the part of coaching that's most important!   With Lineup Assistant you can easily and quickly enter player's information and skill level, along with the various rules set up by your league, and the app will help create an optimized yet conforming lineup. Easily and quickly edit the lineup to make small coaching adjustments and you're ready to play ball!   The app can also create a random lineup, or complete a lineup using just the first inning positions as a guide. Or you can create a lineup from scratch and LineupAssistant will check to make sure your lineup conforms to league settings. With one click, you can text or email the complete lineup to other coaches or parents. Also print the handy inning by inning position charts to help inexperienced players know exactly where to go on the field each inning. Save all your information with multiple teams and simply delete or add new players to make things even easier for the next game! Visit www.lineupassistant.com for more information.

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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 Navigation
Axios
React Query
Expo Image Picker
Zustand
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.