App Overview

Pool Clock icon

Pool Clock

Sohta Itoh · Health & Fitness

Pool Clock is designed for interval-based training during swimming exercise.

$0.99

PRICE
$0.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.8
4 ratings · Top 50%

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 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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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 Pool Clock: map the core Health & Fitness 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 advanced analytics and insights.

Assumption to check: Limited features for tracking workouts

Validate with people who use this workflow before building.

Hypothesis 2

Implement social sharing and challenges.

Assumption to check: No social features for sharing progress

Validate with people who use this workflow before building.

Hypothesis 3

Introduce themes and personalization options.

Assumption to check: Basic UI with no customization options

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

Pool Clock is designed for interval-based training during swimming exercise. This app simply reproduces the traditional analog swimming pace clock found on the pool deck. By placing your device or a TV monitor connected to the device at the poolside, you can start swimming workouts wherever you are. Be careful to keep your electronic device waterproof when use it poolside. *** Interval *** With the interval function, you can easily track the interval on the pace clock. Once you set the Interval Time, Iteration (the number of interval repetitions), and Preparation time (time before the first start), a small triangle appears on the outside of the dial of the clock to indicate the next start time. *** Digital Clock *** The digital clock can be displayed or hidden using the ON/OFF button in the menu. The digital clock displays the current time of the device. You can choose between 12-hour or 24-hour display. *** Sound *** You can turn on/off the countdown beep sound in the menu. *** Notice *** This app prevents the screen from turning off while it is open.

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

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
Zustand
react-navigation
expo-av
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.