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
Ball AI - Basketball Training
HOW TO USE BALL AI:
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
5,103 ratings · Top 5%
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 included17 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 Ball AI - Basketball Training: 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
Introduce more diverse training options and customizable plans.
Assumption to check: Limited variety in training programs
Validate with people who use this workflow before building.
Hypothesis 2
Add forums or social sharing options for users to connect.
Assumption to check: Lack of community features for interaction
Validate with people who use this workflow before building.
Hypothesis 3
Create clearer subscription options and highlight free features.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Provide deeper insights into performance metrics and training progress.
Assumption to check: Analytics might not be detailed enough
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
HOW TO USE BALL AI: 1. Set your phone on the ground or mount it on a tripod 2. Choose shooting, finishing, dribbling, or a guided workout 3. Train while Ball AI tracks every rep 4. Get your full AI breakdown, including makes, misses, shooting percentage, court location, release angle, release time, dribble speed, height, force, personalized feedback, AI ratings, guided drills, and more For shooting and finishing, place your phone behind the three-point line on the left or right wing with you and the hoop visible. For dribbling, stand closer and keep your feet and basketball inside the frame. If you want to become the best player on your team, Ball AI will help you get there faster than anything else. We aren’t an expensive private trainer, shooting machine, or sensor system. Ball AI gives you an accurate, personalized AI basketball coach directly from your phone. Unlock your free trial and start training today. Any questions, feedback, or ideas? Reach out to us at [email protected] NOTE: Using the evolutionary tracking features in this app requires a subscription. Privacy Policy https://www.ballai.app/privacy-policy Terms of Use https://www.ballai.app/terms-of-use
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.
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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.
