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 Score Keepr
Tennis Score Keepr is an app designed to track your score during a tennis match
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
8 ratings · Top 30%
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 Tennis Score Keepr: 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
Allow users to customize scoring formats and match types.
Assumption to check: Limited customization options for scoring formats.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing to allow users to share scores and achievements.
Assumption to check: No social sharing features.
Validate with people who use this workflow before building.
Hypothesis 3
Provide more in-depth player statistics and performance analytics.
Assumption to check: Basic statistics without detailed analytics.
Validate with people who use this workflow before building.
Hypothesis 4
Implement cloud backups for user data and match history.
Assumption to check: No cloud backup feature.
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
Tennis Score Keepr is an app designed to track your score during a tennis match. There is 2 ways to use the app, as a player with the Apple Watch or as a referee with the iPhone while seating on the bench. There is also 2 modes of data storage: - Local mode (included) where you each player tracks its score individually. - Cloud connected mode (Premium Connectivity required: $2,49/month), where one player creates a match and shares it with the other players. Only that player can track the score and it is synchronized on everybody else’s iPhone and watches (a network connection is required). With the connected mode, players will also be able to share a weblink to anyone who wants to see and track the score in live. At the end of the match each player can see the match statistics and timeline. Finally, the app comes with a fine settings options that allows you to play in any kind of configurations. Your tennis match is geolocated so you will remember where it took place. The app is using HealthKit to track metrics during a tennis match. It displays your current heartbeat and active kilo calories at glance on your Apple Watch. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Supabase
Zustand
React Navigation
TypeScript
BUILD KIT DIFFICULTY
Intermediate
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.
