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
Tennis Coach Plus HD
Video Analysis for Tennis - Anyone Anywhere Anytime
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
2 ratings · Top 50%
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/
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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 Tennis Coach Plus HD: 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
Offer more diverse drills and allow users to create custom drills.
Assumption to check: Limited drill variety and customization options
Validate with people who use this workflow before building.
Hypothesis 2
Enhance analytics with advanced metrics and visualizations.
Assumption to check: Performance tracking lacks depth
Validate with people who use this workflow before building.
Hypothesis 3
Provide additional value to justify premium pricing and consider a one-time purchase option.
Assumption to check: Subscription model may not appeal to all users
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
Video Analysis for Tennis - Anyone Anywhere Anytime RECORD | COMPARE | IMPROVE your tennis shots Tennis Coach Plus HD is a new generation performance development tool - a powerful video coaching app enabling tennis coaches to provide beginner to elite players with immediate visual feedback during training sessions and after competition. RECORD - Coaches, assistants, teachers or parents can record HD video and then provide players with technique analysis by replaying their serve, ground strokes and net play action in real time, slow motion and frame by frame. Feedback can be recorded onto a new video or built as a PDF coaches report with key images and annotations. COMPARE - Performance improves when we are able to observe and compare. Players observe the finer points of their tennis technique then compare with the technique demonstrated in other video clips using the side by side and overlay video display features. IMPROVE - Being able to observe a technical issue which becomes clear once a player's own clip is played alongside a reference clip or being able to observe the 'before and after' clips for a player who is applying a change their coach has recommended provides the visual evidence and motivation needed for sustainable change and improvement. Create new super slow motion videos of single, dual or overlay clips with voice over and drawing annotations included. Extensive FAQs included in the app explain the app's recording and video display options. The app's integrated file sharing capability means that large numbers of video clips can be managed by shifting them to and from a computer and the recording device. MAJOR FEATURES SUMMARY • 7 tennis reference video clips for comparison • records user clips in HD with selectable frame rate • imports clips from camera roll or copies them to camera roll • up to 8 times realtime digital Video Zoom while recording • renames, trims, splits, emails and deletes user clips • option to produce low resolution clips when emailing or uploading to Dropbox/YouTube • enables replay, zoom in replay, coloured annotation, voice annotations, text annotations, measurement of angles and analysis of all clips • Produce coaching reports as Video or PDF presentations • PDF reports includes a database to store common flaw descriptions for quick retrieval • displays two clips side by side or overlaid for comparison (unsynchronized and synchronized) • generates a readily emailable recording of any two side by side or overlay video clips with voice over • personalised watermark on screen record videos • uploading to Dropbox, Facebook, Sugarsync and YouTube • includes a speedometer for measuring the speed of a serve • enables setting adjustments • provides FAQs and usage information including tips in tennis coaching settings • supports iTunes file sharing capabilities for copying clips in or out of the application • full support for all screens in landscape and portrait mode Tennis Coach Plus HD is designed for the coach, teacher, parent and player to assist in technique development. ---------------------------------------------- FEEDBACK Experiencing issues? Have comments or suggestions for future features? Please contact us at [email protected]
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
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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.
