App Overview

Ultimate Stopwatch icon

Ultimate Stopwatch

Pinetree Software · Sports

The Ultimate Stopwatch is a professional timing tool, essential for coaches, trainers, and PE teachers who need to track multiple athletes across multiple events.

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.7
67 ratings · Top 15%

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 included16 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 Ultimate Stopwatch: 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

Allow users to categorize laps or add notes.

Assumption to check: Limited lap tracking options

Validate with people who use this workflow before building.

Hypothesis 2

Simplify the purchase process and clarify benefits.

Assumption to check: In-app purchase confusion

Validate with people who use this workflow before building.

Hypothesis 3

Enable the app to run in the background while using other apps.

Assumption to check: No background running

Validate with people who use this workflow before building.

Hypothesis 4

Offer themes or layouts to personalize the user experience.

Assumption to check: Lack of customization

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

The Ultimate Stopwatch is a professional timing tool, essential for coaches, trainers, and PE teachers who need to track multiple athletes across multiple events. Simple to use, but powerful enough to handle all your needs, designed specifically for iPhone and iPad. Unmatched Functionality with No Limits • Unlimited Stopwatches: Track any number of users; up to 180 stopwatches can be displayed simultaneously on an iPad Pro for a single race. • Flexible Race Management: Create unlimited races with customizable locations and notes, switching between them with a single swipe. • Laps Without Limits: Record unlimited laps per stopwatch, with the last 4 to 16 laps displayed. • Background Operation: Watches continue running even when the app isn't running, ensuring you never lose track. • Flexible Timing Adjustments: Save temporary laps or stops to assign later, ensuring accuracy even when multiple runners arrive simultaneously. • Undo mistakes: False Start or tapped wrong person? Undo it! Got the wrong time? Edit it anytime. Add or delete watches, even while race is ongoing. Complete Control at your Fingertips • Customizable Activity List: Tailor the built-in activity list to the sports or events you track. • Individual and Master Controls: Start, stop, or reset each watch independently or all at once. • Diverse Stopwatch Formats: Choose from 25 different layouts to suit your needs, controlling watch/button/text size. • Advanced Timing Options: Switch between split and cumulative displays at any time, and control the precision of time display down to thousandths of a second. Comprehensive People Management • Organize your People: Group individuals into teams or classes for streamlined tracking. • Detailed Reporting: Access race history and performance metrics for each participant, including their personal bests. • Easy Importing: Import contacts directly from your address book, complete with photos and emails. • Photos: so you can tell who's who in a large group. Flexible Launch Choices • Quick Race Launching: Use the volume button to start races without needing to look at your device. • Visual Organization: Automatically sort watches (as each person completes a lap, they drop to the bottom, so next lap they're easy to find) or manually arrange as needed. • Staggered Starts: Spread out your runners over time. • Full-Screen Launch Board: Let each runner knows it's their time to go. • Batch races: launch another group all at once. • Simultaneous Races: Easily navigate between multiple ongoing races. Dynamic Reporting • Add Personal Notes: Enhance reports with notes for each race or participant. • Sorting and Graphing: Sort reports by time or name, or graph your results. • Exporting: Use your data in other apps, like Excel. • Activity Tracking: Monitor which types of activities are timed and locate races by name or map. • Find a race: Search by name, or use the map to find it by location. The Ultimate Stopwatch is not just a tool; it’s a game-changer for anyone serious about timing in sports. With robust features and user-friendly design, it empowers coaches and trainers to focus on performance while effortlessly tracking times.

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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
Redux
React Navigation
Zustand
Expo-Sound
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.