App Overview

Javelin Video Analysis icon

Javelin Video Analysis

Sydney White · Sports

Take your throwing performance to the next level with a powerful Javelin Video Analysis app built specifically for iPhone and iPad

$0.99 · In-app purchases

PRICE
$0.99
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.

Build your own version

Build Kit

Make this idea yours

A product spec, screen plans, and build steps for your coding agent.

First kit free with a verified email

Add to a Remix

Combine features and design from your favorite apps.

Kit ready. Verify your email to download it.

What's included16 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.

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.

JavaScript is required to complete mailbox verification.

Free quick prompt For a smaller starting point

Quick prompt

> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for Javelin Video Analysis: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

Preview ready. Verify your email to reveal and copy the full prompt.

JavaScript is required to complete mailbox verification. Return to this prompt preview.

Continue in Rork copies the full prompt to your clipboard first, then opens Rork in a new tab.

Continue in Rork >

Affiliate link: CloneChart may earn a commission at no extra cost

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

Include more advanced editing features like slow-motion, annotations, and drawing.

Assumption to check: Limited video editing tools compared to competitors.

Validate with people who use this workflow before building.

Hypothesis 2

Add social sharing and community analysis features.

Assumption to check: Lack of user feedback and community features.

Validate with people who use this workflow before building.

Hypothesis 3

Implement a more visually appealing and user-friendly interface.

Assumption to check: Basic UI lacks modern design elements.

Validate with people who use this workflow before building.

Hypothesis 4

Provide cloud storage options for users to save and access videos across devices.

Assumption to check: No cloud storage for videos.

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

Take your throwing performance to the next level with a powerful Javelin Video Analysis app built specifically for iPhone and iPad. Using advanced motion analysis, the app breaks every throw into five critical phases—Approach Run, Cross-Step, Power Position, Release, and Follow-Through—giving you a complete, frame-by-frame understanding of your technique. Instantly identify how effectively you build speed, create torque, and transfer energy through the throw. With visual markers highlighting key moments—green for maximum separation, blue for optimal bracing, and red for peak release—you’ll never miss the details that matter most. Go beyond basic video playback with detailed, technique-specific metrics that turn your performance into measurable data. The app calculates hip-shoulder separation angles, bracing leg extension, elbow height, arm extension, and balance—all tailored specifically to javelin mechanics. Each phase is scored out of 10, with personalized feedback and actionable recommendations designed to improve your throw immediately. Whether you’re refining your release angle or optimizing your power position, every insight is built to help you throw farther, safer, and more efficiently. Bring your coaching to life with professional-grade drawing and annotation tools. Use freehand sketches, lines, arrows, circles, and automatic angle measurements to visually break down technique and highlight areas for improvement. Customize colors and line thickness, track movement paths, and create clear visual comparisons between throws. Combined with precise frame-by-frame controls and ultra slow-motion playback down to 0.1x speed, you can analyze every millisecond of motion and capture the exact mechanics behind elite performance. Designed for athletes, coaches, and researchers alike, the app also features manual metric tracking, athlete height and distance calibration, video library management, and seamless sharing options. Validate real javelin throws with intelligent detection, collect biomechanical data with pinpoint accuracy, and explore built-in “Learn & Train” resources covering technique, drills, and sports science. With support for both metric and imperial units and left- or right-handed athletes, this all-in-one platform delivers professional-level javelin analysis right in your pocket.

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

< Scroll to see more >

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
expo-av
react-navigation
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.