App Overview

BatApp: Baseball Exit Velocity icon

BatApp: Baseball Exit Velocity

Juuso Mikkonen · Sports

Measure Exit Velocity and Launch Angle for every hit - no radar gun, no extra equipment, just your phone.

$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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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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for BatApp: Baseball Exit Velocity: 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

Add social sharing and analytics features.

Assumption to check: Limited features compared to competitors

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to set goals and customize settings.

Assumption to check: No user customization options

Validate with people who use this workflow before building.

Hypothesis 3

Offer a free version with ads and a premium version with enhanced features.

Assumption to check: High price for basic functionality

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

Measure Exit Velocity and Launch Angle for every hit - no radar gun, no extra equipment, just your phone. BatApp turns any baseball or softball field into a measurement lab. Time the ball's flight, mark where it landed and get accurate hitting metrics instantly. Perfect for players tracking their progress, coaches running drills and parents who want real data without spending hundreds on radar equipment. How it works Open the map, pin home plate and you're ready. When the bat hits the ball, press and hold the timer button. Release it the moment the ball lands or is caught. Tap the landing spot on the map. BatApp does the rest: Exit Velocity and Launch Angle, calculated from physics, not guesswork. Works for baseball and softball The aerodynamic model is calibrated for a standard baseball but works for softball too. Exit velocity error for softball is under 1 mph for a 12" softball and under 0.5 mph for an 11" ball. Accurate where it counts The data model is accurate within ±2 mph and ±2° more than 80% of the time. Some conditions like wind or ball spin can cause deviations. A 0.2 s timing error translates to roughly 3 mph and 3° of error, and a 10 ft landing-spot error translates to about 3 mph and 1° on a typical 200 ft hit. Pro tips The best way to reduce distance error is to watch from the outfield where you can estimate the landing spot most accurately. The best way to reduce timing error? Work on your reaction time.

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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
TypeScript
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.