# Curtain Calc Pro

> Coverage & Fit Calculator

Canonical page: [https://chrome-stats.com/d/id6770147174](https://chrome-stats.com/d/id6770147174)

## Overview

- **ID:** `id6770147174`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** 晓 郭
- **Category:** Utilities
- **Version:** 1.0
- **Last updated:** 2026-05-18
- **First published:** 2026-05-18
- **Size:** 691 KB
- **Data as of:** 2026-09-23
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/curtain-calc-pro/id6770147174)
- **Privacy policy:** [https://adler0518.github.io/apps\_privacys/CurtainCalc-privacy.html](https://adler0518.github.io/apps_privacys/CurtainCalc-privacy.html)

## Description

Physics-based coverage model: accounts for side/top overlap geometry to give an accurate blackout percentage.

Curtain Calc uses a geometric coverage model to calculate how effectively a curtain panel blocks light from a given window.

CALCULATION MODEL
The engine computes direct-cover area minus an edge-leak penalty. The penalty is derived from the difference between the curtain's actual overlap and the user's target overlap on both side edges and the top. The result is a dimensionless coverage ratio (0–1), displayed as a percentage.

INPUT PARAMETERS
• Window width & height (cm)
• Curtain panel width & height (cm)
• Desired side overlap (cm, each side)
• Desired top overlap (cm)

OUTPUT
• Coverage percentage with color-coded rating
• Recommendation: whether curtain width or height needs to increase

HISTORY & RE-USE
Calculations are persisted via UserDefaults. Each record can be named, browsed in a list, and reloaded into the calculator as a prefill.

LOCALIZATION
English and Simplified Chinese, runtime-switchable without restart.

PRIVACY
Zero network activity. Zero data collection. No third-party SDKs.

## Rankings

- #1,871,977 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6770147174)