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
This season, live the game like never before with GameChanger, the #1 youth sports app
Free · In-app purchases
OVERALL US RANK
#81
Grossing · all categories
REVENUE (Est)
$215K/mo
$118K - $311K
RATING
★ 4.9
918,030 ratings · Top 5%
Evidence scope: #81 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
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A product spec, screen plans, and build steps for your coding agent.
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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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
This season, live the game like never before with GameChanger, the #1 youth sports app. Coach smarter. Connect live. Replay the action. All with tools designed to elevate the season for coaches, club directors, athletes, youth sports families, and fans. COACH SMARTER Coach smarter with tools like Game and Player Insights, lineup recommendations, team messaging, and announcements, so you can stay organized, make informed decisions, and support stronger player development. CONNECT LIVE Connect live to every game and get real-time play-by-plays whether you’re on the field, on the go, or cheering from home thanks to a suite of live streaming tools, digital scorekeeping, Full HD (1080p) live streaming, free game alerts, and more. REPLAY THE ACTION Replay and share the biggest moments of every game automatically with highlight clips, recap stories, video archives, Career Profiles, and more. EASY-TO-USE SCOREKEEPING TOOLS Track the game faster, easier, and more reliably with intuitive scorekeeping tools available for dozens of sports. LIVE HD VIDEO STREAMING Stream games live for free in Full high-definition 1080p and bring a high-quality version of the game to anyone, anywhere complete with real-time scoreboard overlays that keep viewers up to date throughout the game. FREE TEAM MANAGEMENT Keep teams connected with built-in messaging, scheduling, RSVPs, and photo sharing free for everyone — all in one place. ROSTER MANAGEMENT Build and manage rosters with a centralized team view and seamless imports from MaxPreps, Sports Connect, or a past season on GameChanger. LINEUP RECOMMENDATIONS Build lineups that reflect real performance and give athletes the opportunities they’ve earned with data-backed lineup suggestions before every game. GAME & PLAYER INSIGHTS Coaches receive clear, easy-to-understand offensive and defensive insights for every baseball, softball, and basketball game to help shape practice plans and game strategy. And families and fans get game and season-level insights specific to their player. SHAREABLE CAREER PROFILES Create customizable Career Profiles showcasing individual stats and key video highlights to aid in player development and share with family, friends, or recruiters. AUTOMATIC HIGHLIGHT CLIPS Re-watch or share automatically generated video clips of every play or point scored by your team throughout the game when you stream and score. RECAP STORIES Catch up on a game’s biggest moments with a newspaper-style account of a scored baseball, softball, or basketball game. GAME HIGHLIGHT REELS Watch your team’s top offensive and defensive plays from a game in a single, comprehensive reel. EXTERNAL CAMERA COMPATIBILITY GameChanger is compatible with Mevo, GoPro, XbotGo, and other third-party cameras using RTMP. FREE FOR COACHES & 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 Access your teams any time in the app or on the web at gc.com. GameChanger is currently available for: 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. 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 >
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.
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.
