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
GameChanger
Stream and score your team’s games and keep fans connected to the action with GameChanger, the #1 youth sports app
Free · In-app purchases
OVERALL US RANK
#54
Grossing · all categories
REVENUE (Est)
$303K/mo
$172K - $434K
RATING
★ 4.9
897,552 ratings · Top 5%
Evidence scope: #54 is the current overall US Grossing chart position. 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.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 GameChanger: 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
Improve navigation with better filtering and sorting options.
Assumption to check: Users report difficulty in navigating through multiple teams and games.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize API calls and implement caching for faster data retrieval.
Assumption to check: Inconsistent loading times for stats and game data.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance user engagement by allowing more customization for team branding.
Assumption to check: Limited customization options for team profiles.
Validate with people who use this workflow before building.
Hypothesis 4
Provide granular control over notification settings for users.
Assumption to check: Push notifications can be overwhelming.
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
Stream and score your team’s games and keep fans connected to the action with GameChanger, the #1 youth sports app. All you need is a mobile device. Plus, coaches can access premium features, including stats and archived video for FREE! EASY-TO-USE SCOREKEEPING TOOLS Ditch the paper scorebook with an intuitive FREE scorekeeping experience and get advanced scorekeeping tools and features for baseball, softball, basketball, soccer, lacrosse, football, hockey, field hockey, water polo, and rugby. LIVE VIDEO STREAMING Set up a live game stream in just three taps using a mobile device or external camera to bring the game to anyone, anywhere. A live scoreboard overlay keeps viewers updated in real time, so family and friends never have to miss a game! AUTOSTREAM FOR BASKETBALL Live stream basketball games easily with AutoStream, our proprietary AI-powered technology that delivers a hands-free full-court streaming experience for FREE. No complex setup required — all you need is a mobile device. FREE TEAM MANAGEMENT Streamline team communication for 20+ sports with free in-app messaging, photo sharing, and event scheduling with RSVP and calendar sync. ROSTER MANAGEMENT Keep roster and team contact info all in one place. Automatically populate your entire team roster in seconds by importing from MaxPreps, Sports Connect, or a past season on GameChanger. TRACK BASEBALL & SOFTBALL STATS Track 150+ basic and advanced baseball and softball stats, including pitch count, batting average, ERA, quality at-bats, and more. ADDITIONAL FEATURES: EXCLUSIVE VIDEO Streamed games are automatically stored in the video archive, and highlights from games that are streamed and scored are automatically clipped. Coaches and premium subscribers can access and review full game video and highlights at any time. SHAREABLE ATHLETE PROFILES Baseball, softball, and basketball players can showcase individual stats and key video highlights on customizable athlete profiles that can be shared with family, friends, or recruiters. (Paid subscription required for fans.) PITCHING AND BATTING SPRAY CHARTS Make informed game-time decisions with pitching and batting spray charts for baseball and softball. PITCH COUNT TRACKING (Baseball only) Get relevant information to help monitor pitcher usage and keep players safe, with stats like pitch count, innings pitched, and innings caught. FREE FOR COACHES AND TEAM STAFF GameChanger premium features like video highlights, video archives, career stats, and spray charts remain completely free for coaches and team staff. (Paid subscription required for fans.) WEB PORTAL Manage team rosters, schedules, and review stats at our web portal at gc.com. EXTERNAL CAMERA COMPATIBILITY GameChanger is compatible with Mevo, GoPro, or other third-party cameras using RTMP. GameChanger is currently available for the following sports: baseball, softball, soccer, basketball, lacrosse, football, volleyball, field hockey, ice hockey, water polo, rugby, swimming & diving, track & field, wrestling, crew & rowing, bowling, cheerleading, cross country, tennis, and golf teams. Terms of Use: https://gc.com/home/terms California Disclosures: https://dickssportinggoods.com/s/california-disclosures US Patent No. 8,731,458
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
Axios
react-navigation
react-native-gesture-handler
BUILD KIT DIFFICULTY
Advanced
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.
