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
Water Polo Statistics
Track the following water polo stats for each period of the game:
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 included15 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 Water Polo Statistics: 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
Provide detailed analytics dashboard with advanced metrics.
Assumption to check: Limited in-depth statistics and analytics options for players and matches.
Validate with people who use this workflow before building.
Hypothesis 2
Add share functionality to allow users to share match results.
Assumption to check: No social sharing features to share stats with friends or teams.
Validate with people who use this workflow before building.
Hypothesis 3
Implement player profiles to track performance over time.
Assumption to check: Difficulty in managing player data and stats over multiple matches.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize match settings and add custom rules.
Assumption to check: Limited customization options for match settings.
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
Track the following water polo stats for each period of the game: Goals, Shots Missed, Saves, Goals Against, Assists, Steals, Blocks, Turnovers, Kick Outs Against, Kick Outs Drawn, Swim Off Won, Swim Off Lost, and three statistics of the user's choosing for both goalies and players. The user will be able to set up seasons, games, a full roster of players, and track stats for each player during the course of the season. The user can export the stats for a particular game or a summary of stats for the entire season by tapping on either the Export Game or Export Season buttons. The app also has the ability to log the game time for each stat. The stats can then be emailed to the email addresses of the user's choosing in csv format. Games scores can be Tweeted, emailed, or texted to contacts. No more tracking stats with paper and pencil! App instructions are located here: https://www.buildbytetech.com/apple-user-guide/ Leave feedback for app improvements 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
React Native
Expo
Supabase
React Navigation
React Hook Form
React Native Paper
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.
