App Overview

Hold breath longer underwater icon

Hold breath longer underwater

Philipp Baldauf · Sports

Have you ever had a vacation near the ocean where you wished you could hold your breath just a little longer to discover the wonders of the underwater world?

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
1 ratings · Top 5%

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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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 Hold breath longer underwater: 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

Offer a wider variety of training plans and customization options.

Assumption to check: Limited training plans available

Validate with people who use this workflow before building.

Hypothesis 2

Add social sharing features to encourage competition and community.

Assumption to check: No social features

Validate with people who use this workflow before building.

Hypothesis 3

Provide in-depth analytics on user progress and trends.

Assumption to check: Lack of detailed analytics

Validate with people who use this workflow before building.

Hypothesis 4

Implement reminder features to encourage regular training.

Assumption to check: No reminders or notifications

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

Have you ever had a vacation near the ocean where you wished you could hold your breath just a little longer to discover the wonders of the underwater world? "Hold your breath" is an iPhone exclusive training app that helps you to prolong the duration of your breath holding. The app features the two most known training methods. The first are Co2 tables that enhance your tolerance regarding Co2 levels in your blood. The second are O2 tables which help extending your maximum breath hold time. WARNING: Never train alone! You should always have someone next to you that knows that you are training and understands the risk involved. Never train more than one session per day! Also do not train more than two times a week. Stop the training immediately when you feel uncomfortable. Do not under any circumstances provide a wrong maximum breath hold time. This is used to calculate the suggested session times. Consult with your doctor before starting to train. The training can lead to blackouts, loss of motor control (LMC), serious and irreparable damages to the respiratory system, serious and irreparable damages to the brain, other serious health damage or death. DISCLAIMER: The showed times are only suggestions that do not guarantee any training success. Any training session suggested by the app has to be carefully reviewed by a professional prior to training.

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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.

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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.