App Overview

Sailing Handicap Calculator icon

Sailing Handicap Calculator

Zestech · Sports

The best and most popular sailing handicap calculator app on on the market

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.5
2 ratings · Top 15%

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 Sailing Handicap Calculator: 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

Implement comprehensive input validation and guidelines for users.

Assumption to check: Limited input validation can lead to incorrect handicap calculations.

Validate with people who use this workflow before building.

Hypothesis 2

Provide clear descriptions of premium features and benefits.

Assumption to check: In-app purchases can be unclear or confusing.

Validate with people who use this workflow before building.

Hypothesis 3

Add social sharing options for calculated results.

Assumption to check: Lack of user engagement features like sharing results.

Validate with people who use this workflow before building.

Hypothesis 4

Enable offline access to previously calculated handicaps.

Assumption to check: No offline functionality or data persistence.

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

The best and most popular sailing handicap calculator app on on the market. It is commonly used by sailors and race committees all around the world. It supports all the major worldwide sailing race handicap systems. The app calculates the handicapped corrected times for a race and shows the results in order. The elapsed times can be entered manually or automatically by using the built in timer feature. This works by pressing the finish button for each boat as they go over the line to automatically record their elapsed times. The race start time can be started using a timer count down or by entering a start time. This app is compatible with ORC (Time on Distance and Time on Time), IRC, PHRF (Time on Distance and Time on Time), Portsmouth UK and Portsmouth US handicap. Simply select the handicap option you want to use. Use the ORC Download feature (In App Purchase) to automatically populate any of the ORC handicap values for any boat with a valid ORC certificate. While scrolling through the ORC boats you can view the sail number, boat length, boat class/design, build year, builder, weight, draft, beam, sail area for each sail, wetted surface area and more. The results can be emailed as a table in the body of the email and also attached as a CSV file (Excel Compatible spreadsheet file). Very simple and easy to use.

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.

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BUILD KIT DIFFICULTY
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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.