App Overview

Stopwatch Max: Lap Timer icon

Stopwatch Max: Lap Timer

Mariam Markosyan · Sports

The stopwatch built for your wrist — now on your phone too

$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.

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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 Stopwatch Max: Lap Timer: 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 customize timer sounds and themes.

Assumption to check: Lack of customization options for users

Validate with people who use this workflow before building.

Hypothesis 2

Implement sharing options for lap times on social media.

Assumption to check: Limited sharing functionality

Validate with people who use this workflow before building.

Hypothesis 3

Provide a history screen that records past sessions and lap times.

Assumption to check: No history of previous sessions

Validate with people who use this workflow before building.

Hypothesis 4

Introduce a free tier with ads and optional in-app purchases for premium features.

Assumption to check: Monetization might deter users

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 stopwatch built for your wrist — now on your phone too. Stopwatch Max is a precision lap timer designed for Apple Watch, where it runs entirely on its own, with a full iPhone app that stays on the same run. Raise your wrist and go. TRACK EVERY LAP Capture every split with pinpoint accuracy. Record laps with a tap, a double-tap, a hand gesture on Apple Watch, or automatically at an interval you set — whatever feels right in the moment. Every split is logged instantly and displayed in real time, so you always know exactly where you stand. WATCH AND IPHONE, ONE RUN Start a run on your wrist and see it tick on your phone. Laps, elapsed time and the running state mirror across both devices, and a finished run lands in the history on each one. Use either device alone, or both together. YOUR SESSION HISTORY Every run is saved — laps, splits, date, and your average and maximum heart rate. Open any session to see the full lap list exactly as you recorded it. HEART RATE, LAP BY LAP Turn on heart-rate recording and your Apple Watch captures your heart rate at the moment you take each lap, not just the average and maximum for the whole run. See how you climbed, and where you recovered. SHARE AND EXPORT On iPhone, send a run as a clean summary, export it as a CSV for your spreadsheet, or share it as an image card with a chart of your splits, your average line and your fastest lap highlighted. HEALTHKIT WORKOUTS With heart-rate recording on, every timing session on Apple Watch is logged as a workout in Apple Health, with lap events recorded as activity milestones — a structured log of every run. Leave it off and Health is never asked for. SIRI SHORTCUTS Your hands are busy. Start, lap, pause, resume and reset — all hands-free with Siri, from anywhere, at any time. Whether you're mid-rep, mid-lap, or mid-race, your voice is all you need. WATCH COMPLICATIONS Add Stopwatch Max to any watch face and launch it instantly with a single tap — no swiping, no searching. Have your stopwatch ready the moment you need it. TUNED TO YOU Set an auto-lap interval, choose your display refresh rate, and feel a lap without looking — on Apple Watch the lap haptic comes in Light, Medium and Strong. BUILT TO LAST Your timer state is saved automatically in the background. Switching apps, checking a notification, or restarting your watch won't cost you a single second. Come back to your stopwatch exactly as you left it. WORKS IN YOUR LANGUAGE Fully localized in English, German, Spanish, French, Japanese, Russian, and Simplified Chinese. PRIVACY FIRST No ads. No subscriptions. No data collected. A one-time purchase that respects your time and your privacy. Simple enough for your first workout. Precise enough for your best one.

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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
React Navigation
AsyncStorage
Expo AV
Zustand
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.