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
PinPal
PinPal is a bowling scorekeeping application designed to provide bowlers with detailed statistics to help improve their average.
$8.99 · In-app purchases
PRICE
$8.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
5,004 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 included18 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 PinPal: 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
Implement a more engaging friend discovery and interaction system.
Assumption to check: Limited social features for connecting with friends
Validate with people who use this workflow before building.
Hypothesis 2
Enhance the score analytics with visual graphs and trends.
Assumption to check: Inconsistent score tracking and statistics
Validate with people who use this workflow before building.
Hypothesis 3
Clarify the benefits of premium features with better onboarding.
Assumption to check: Premium features may be confusing for users
Validate with people who use this workflow before building.
Hypothesis 4
Add push notifications for friend activity and game reminders.
Assumption to check: Lack of notifications for game updates
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
PinPal is a bowling scorekeeping application designed to provide bowlers with detailed statistics to help improve their average. PinPal keeps track of both leagues, tournaments, and open bowling, allowing bowlers to view their average and other statistics in many different ways. PinPal puts tons of useful stats right at your fingertips. Ever wondered what your average would be if you picked up all your single pin spares? Ever wondered what spares you leave the most, and how often you are able to pick it up? Well now you can find out! Scores can be entered either by selecting all the pins you knocked down or entering the scores you get for each ball. Also, if you don't want to take the time to enter each frame, you can just enter the final score for the game. Make sure to check out PinPal Lite if you want to try it out before buying! Any questions, comments, concerns, complaints, compliments, suggestions, or feedback of any other sort can be directed at [email protected], or to our Facebook page at www.facebook.com/PinPalBowling.
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
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BUILD KIT DIFFICULTY
Starter
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.
