App Overview

QR Stopwatch icon

QR Stopwatch

Ursin Tanner · Sports

Use this clever app for the timekeeping of several people, starting at different times or as group

$3.99

PRICE
$3.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.2
4 ratings · Below Average

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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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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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 QR 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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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

Use this clever app for the timekeeping of several people, starting at different times or as group. It works without a single click - just show it any QR code to start a new stopwatch! HOW IT WORKS 1) SINGLE START: Use this clever app for the timekeeping of various persons, starting at different times. Simply hold the QR code in front of the scanner. The app will then automatically generate your name and a new individual stopwatch will be started. If you scan the code again, the timer stops. It’s also possible to resume the same watch again. 2) MASS START: If all participants are starting at the same time, then you should use the mass start mode. Start the stopwatch without any further adjustments and simply record the finishing time and the name of the runners when they reach the finish line. EXAMPLES OF USE - Reporting of working time. - Timekeeping of sporting events. - Report the students’ work time for special tasks. -> NO CLICKS Start the app and it will automatically take the time of all shown QR codes until you stop the scanner. -> NO TYPING OF NAMES The app automatically creates new items if a new QR code is shown. The name is whatever the QR code contains. -> GET A RANKING Choose the sort order: Would you like to know the fastest or slowest time? Decide if not-yet-stopped watches will be disqualified or stop all operating watches at once. -> SAVE AUTOMATICALLY Close the app and work on the same data the next day. All data is saved automatically. -> EXPORT Save and export rankings by email as .csv files. -> MANUAL INTERVENTION Use your finger to tap on a name to start a stopwatch manually. Tap again to stop it. As administrator you can also stop all running timers at the same time. If there is a person without QR code, it is possible to add a timer manually. -> CREATE MULTIPLE QR CODES ONLINE AT http://www.teaching-apps.com Simply type in all names/items at once and get multiple QR codes in a PDF, which you can then print and save. It couldn’t be any easier! Each QR code is embedded in a student ID card in a credit card size. These cards can be used for different apps and uses. Be sure to subscribe to the newsletter to receive updates on any new apps.

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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

Provide advanced timer features like intervals and countdowns.

Assumption to check: Limited functionality for managing timers

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to customize timer names and sounds.

Assumption to check: Lack of customization options

Validate with people who use this workflow before building.

Hypothesis 3

Enable users to share timers via social media or messaging apps.

Assumption to check: No social sharing features

Validate with people who use this workflow before building.

Hypothesis 4

Implement filters and search capabilities for timer history.

Assumption to check: Basic history view

Validate with people who use this workflow before building.

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
expo-camera
react-native-paper
Zustand
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.