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.
Youlan is an AI-powered basketball shooting analysis app for players, trainers, and coaches
$2.99 · In-app purchases
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.
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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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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 plan preview for 有蓝: 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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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
Assumption to check: Lack of user engagement features like social sharing or challenges
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited training types and flexibility
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor onboarding experience
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No feedback mechanism for users
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Youlan is an AI-powered basketball shooting analysis app for players, trainers, and coaches. Record or select a side-view shooting video, and the app automatically identifies the full shooting motion and generates analysis across rhythm, posture, ball-body coordination, and release parameters. Unlike simple video replay, Youlan breaks your shot into data you can observe, compare, and review. You can view an overall score, loading and lift rhythm, knee and hip angle changes, upper-arm and forearm angles, elbow lift and extension range, ball release angle, and other key metrics, then receive prioritized suggestions for improvement. Key features: - On-device video analysis: after you choose a side-view shooting video, the core analysis is completed locally on your device. Videos are not uploaded to a server during the standard analysis flow. - Shooting phase recognition: automatically analyzes loading, lift, release, and follow-through phases to help you understand your power rhythm. - Posture and release metrics: quantifies key motion parameters such as knee angle, hip angle, arm angles, release angle, and ball-body coordination rhythm. - AI training suggestions: generates practical training advice based on metric deviations and highlights the highest-priority adjustments. - Standard model comparison: compares your motion metrics with a standard shooting model to show similarity and major differences. - Training history: saves local analysis records, tracks score trends, and compares changes between two sessions. - Privacy-friendly: local analysis is available without account registration, and records are managed by you on your device. Recording tips: - Use a side view, preferably from the shooting-hand side. - Keep the phone fixed and avoid following the player with the camera. - Keep the full body in frame, from the set position through landing. - Use good lighting and a clean background, and keep each video focused on one complete shot whenever possible. Youlan is designed for daily shooting practice, personal form review, coach-assisted teaching, and progress tracking over time. It is not a replacement for a coach's judgment; it helps turn "something feels off" into clearer motion data and training priorities.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.