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
Dinger Distance
Dinger Distance - The Ultimate Home Run Tracker
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Dinger Distance: 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
Incorporate social sharing and leaderboards.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Add more graphs and metrics for detailed analysis.
Assumption to check: Limited data visualization options
Validate with people who use this workflow before building.
Hypothesis 3
Introduce forums or chat features to build community.
Assumption to check: No community interaction
Validate with people who use this workflow before building.
Hypothesis 4
Implement subscription tiers for ongoing content.
Assumption to check: Single payment model
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
Dinger Distance - The Ultimate Home Run Tracker Transform every swing into a measurable moment with Dinger Distance, the premier app designed for baseball and softball players who want to track, analyze, and celebrate their power hitting! PRECISE DISTANCE TRACKING Our advanced GPS location tracking technology delivers pinpoint accuracy for measuring your home run distances. Simply mark where you hit and where it landed - we'll do the rest with professional-grade precision. ADVANCED DISTANCE CALCULATOR New! Calculate your batted ball distance instantly with our physics-based calculator. Just input your exit velocity and launch angle, and discover how far your ball would travel under optimal conditions. Perfect for cage sessions, practice swings, or analyzing your hitting mechanics. SOCIAL COMPETITION Challenge friends and teammates in distance competitions. Share your monster shots on social media with custom graphics showing your impressive distances. Create leaderboards and see who's the true power hitter in your group. FOR EVERY LEVEL Whether you're a weekend warrior, high school athlete, college player, or just love taking swings at the local diamond, Dinger Distance helps you track your progress and celebrate those special moments when you really connect.
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
Victory Native
Axios
React Navigation
AsyncStorage
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.
