App Overview

Apnea Trainer icon

Apnea Trainer

Jan Luther · Sports

Ranked in the top 5 best-selling sports apps in Germany, Australia, the UK, and France.

$8.99 · In-app purchases

PRICE
$8.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
1,580 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 included17 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 Apnea Trainer: 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

Add more training modes and customizable sessions.

Assumption to check: Limited training modes available

Validate with people who use this workflow before building.

Hypothesis 2

Provide clearer visualizations and insights on performance.

Assumption to check: User stats can be unclear

Validate with people who use this workflow before building.

Hypothesis 3

Include social sharing options for users to connect.

Assumption to check: No community or sharing features

Validate with people who use this workflow before building.

Hypothesis 4

Simplify the subscription tiers and offer clearer benefits.

Assumption to check: Subscription model can be confusing

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

Ranked in the top 5 best-selling sports apps in Germany, Australia, the UK, and France. ----- Description ----- The precise breath-holding training app for freedivers, snorkelers, and anyone who wants to hold their breath longer. Imagine you’re snorkeling in the ocean on vacation and see large, colorful fish 6 meters below the surface—you’d love to dive down with a long breath and take unforgettable photos. With Apnea Trainer, that’s possible. With three training sessions a week, you’ll quickly double your time underwater. The training principle is regularly used by freedivers. It originates from yoga and strengthens the diaphragm muscles, allowing you to fill your lungs with more oxygen and release more carbon dioxide when exhaling. The smart performance index automatically adjusts training times to your level—you’ll improve without having to do the math yourself. Three training modes: • Apnea Training – Inhale, hold, exhale. Optimal intervals for maximum performance improvement. • Pranayama – Four-phase breathing for relaxation and preparation right before snorkeling or freediving. • Custom Pro – All four phases freely adjustable from 0 to 240 seconds for competitive athletes. Visual and audio instructions (voice prompts and haptic feedback) guide you through each phase. No need to think—just train. Stopwatch & Progress: With the built-in apnea stopwatch, you can measure and save your best breath-hold attempts. Track your personal bests on weekly, monthly, or yearly charts and share special milestones with friends. Motivating Streak System: Stay on track and dive deeper and deeper. Maintain your daily training streak, progress through increasingly deeper zones, and collect over 35 awards for consistency, volume, and personal records. If you miss a day, a Freeze Joker saves your streak. Share unlocked achievements and new personal bests with a tap as a beautiful image on your social networks. Privacy & Sync Without an Account: Your progress is securely synced across all your Apple devices via iCloud without requiring registration or an account. The data is stored exclusively in your private iCloud database—no tracking, no sharing, and the highest privacy standards. More than 10,000 active users confirm its success: Beginners can double their performance within 7 days if they use Apnea Trainer for 3 minutes daily. For advanced athletes, consistent performance gains of 10 to 20 seconds within 10 days have been reported.

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
Supabase
Zustand
React Navigation
React Native Reanimated
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.