App Overview

SwimStart: Reaction Trainer icon

SwimStart: Reaction Trainer

Netflowers Inc. · Sports

Races are won in the first split-second

$2.99 · In-app purchases

PRICE
$2.99
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.

Build your own version

Build Kit

Make this idea yours

A product spec, screen plans, and build steps for your coding agent.

First kit free with a verified email

Add to a Remix

Combine features and design from your favorite apps.

Kit ready. Verify your email to download it.

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/
Preview a sample Build Kit No email needed

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.

JavaScript is required to complete mailbox verification.

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 SwimStart: Reaction 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.
            

Preview ready. Verify your email to reveal and copy the full prompt.

JavaScript is required to complete mailbox verification. Return to this prompt preview.

Continue in Rork copies the full prompt to your clipboard first, then opens Rork in a new tab.

Continue in Rork >

Affiliate link: CloneChart may earn a commission at no extra cost

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

Build features for community sharing and feedback.

Assumption to check: Lack of user reviews and community engagement

Validate with people who use this workflow before building.

Hypothesis 2

Offer customizable workout types and distances.

Assumption to check: Limited workout tracking options

Validate with people who use this workflow before building.

Hypothesis 3

Implement social sharing to motivate users.

Assumption to check: No social sharing features

Validate with people who use this workflow before building.

Hypothesis 4

Provide a free trial period and clear value for premium features.

Assumption to check: Subscription model may 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

Races are won in the first split-second. The moment between the starter's command and your launch off the block decides how far ahead you are when you hit the water. SwimStart trains that exact instant, over and over, in a realistic race setting so your reaction becomes automatic. ■ Starts are won by reaction A faster start doesn't come from thinking harder. It comes from drilling the gap between the signal and your move until it disappears. SwimStart lets you rehearse that gap as many times as you want and measures your reaction down to 1/100 of a second. ■ A real start experience SwimStart recreates the tension on the blocks: - The English voice command "Take your marks" calls you to the line. - A wait follows before the start beep. Choose a random wait for true, unpredictable tension that breaks the habit of anticipating, or a fixed wait when you want a steady rhythm. - An adjustable countdown leads into the command so you can settle into position. When the beep sounds, you launch. SwimStart captures how fast you reacted. ■ Two measurement modes - Touch: tap the screen the instant you hear the beep. - Motion: the accelerometer detects your body's movement, so you can practice an explosive launch with your hands free. Pick the mode that fits how and where you train. ■ False-start detection Move before the beep and SwimStart flags it as a false start with a buzzer, just like a real meet. Learn to hold the line and fire on the signal, not before it. The buzzer can be turned off whenever you prefer a quieter session. ■ Records that track your progress Every attempt is saved automatically: - Best reaction time - Average reaction time - False-start count - Total attempts - Full history Watch your numbers improve session after session and see the proof that your starts are getting faster. ■ Apple Watch support SwimStart runs standalone on Apple Watch, so you can train right at the pool with nothing else in hand, and it works on iPhone and iPad too. The screen stays on during practice so the command and timing are always in view. ■ Who it's for - Competitive swimmers chasing a faster, sharper start - Junior swimmers practicing on their own - Coaches drilling athletes on reaction and false-start discipline - Anyone who wants to train their reflexes Step onto the blocks, wait for "Take your marks," and react. Sharpen the start that wins races.

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

Screenshots

< Scroll to see more >

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-native-chart-kit
react-navigation
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.