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
Volleyball Lineup Tracker
Volleyball Lineup Tracker is a handy utility for volleyball coaches to use before and during matches
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
7 ratings · Top 30%
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 included18 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 Volleyball Lineup Tracker: 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
Add more detailed stats and analytics for players.
Assumption to check: Limited player performance tracking features
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more visually appealing and user-friendly design.
Assumption to check: User interface is not very modern
Validate with people who use this workflow before building.
Hypothesis 3
Include features to share lineups and stats on social media.
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to save templates for different lineups or match types.
Assumption to check: Lack of customization for 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
Volleyball Lineup Tracker is a handy utility for volleyball coaches to use before and during matches. Create multiple rosters including scheduled substitutions and optional libero(s). Track possession, score, time-outs, substitutions, libero swaps, and rotations during a set. Includes support for rally or sideout scoring, side switches, libero serving, and non-standard start/end scores. Replaces and far exceeds the functionality of a plastic rotation locator costing $8-10...it even reminds you when you have scheduled substitutions and liberos moving to the front row! Made by volleyball coaches for volleyball coaches – we use it ourselves for every match. "Used the app for about 6 matches now and I love it. Thank you for this as it is exactly what I have been needing. A feature that I didn't really notice right away and have come to love is the 'undo' screen. A great tool when you have to prove where the score keeper made a mistake!" - Coach Scott Please click on Reviews (select "All Versions") to see other reviews of VBLT from coaches like you. Thanks and please keep those reviews coming so others can find us and join the thousands of coaches already using Volleyball Lineup Tracker! :) For the best results, when you first start, run through the tutorial linked in the Information screen to get familiarized with the app. (https://www.youtube.com/@vblineuptracker)
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
Zustand
react-navigation
react-native-chart-kit
@expo/vector-icons
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.
