App Overview

Sea Current Measure Tool icon

Sea Current Measure Tool

Master Sailing jdoo · Sports

Sea Current Measure Tool helps sailors and coaches quickly measure sea current speed and direction directly on the water using only an iPhone.

$19.99 · In-app purchases

PRICE
$19.99
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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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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Sea Current Measure Tool: 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 features for tide prediction and weather integration.

Assumption to check: Limited functionality for advanced measurements

Validate with people who use this workflow before building.

Hypothesis 2

Include options to share measurements on social media.

Assumption to check: Lack of social sharing options

Validate with people who use this workflow before building.

Hypothesis 3

Simplify the subscription model and clarify benefits.

Assumption to check: Subscription management can be confusing

Validate with people who use this workflow before building.

Hypothesis 4

Allow users to access previous measurements offline.

Assumption to check: No offline access to measurements

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

Sea Current Measure Tool helps sailors and coaches quickly measure sea current speed and direction directly on the water using only an iPhone. The app is designed for sailing race preparation and training. Understanding the current in the race area can be critical for making the right tactical decisions. Even small currents can affect boat speed, laylines and mark roundings. Sea Current Measure Tool allows you to perform quick and reliable current measurements while on the water. Simply drop a floating stick or object into the water, press Start, wait a few seconds, retrieve the stick and press Stop. The app calculates the speed and direction of the water movement using GPS data. All measurements are stored so you can review them later and build a better understanding of the current patterns in your sailing area. Features Measure sea current speed and direction Simple start and stop measurement process GPS based current calculation View a list of all measurements Display measurements on the map Useful for race preparation and training sessions Designed for sailing coaches and racers How it works Drop a measuring stick or floating object in the water Press Start when the stick enters the water Wait a few seconds while the stick drifts Retrieve the stick and press Stop The app calculates the current vector based on the GPS movement Use cases Sailing race preparation Training sessions Understanding current patterns Mapping current across the race area Coaching analysis and tactical planning Sea Current Measure Tool is designed for sailors who want a fast and practical way to measure sea current directly on the water without additional equipment. Location access is required to calculate the movement of water during measurements and to display measurements on the map.

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Screenshots

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Build scope

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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
Victory Charts
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.