# Curtain Calc Pro — Coverage & Fit Calculator

> Coverage & Fit Calculator (iPhone/iPad app by 晓 郭.)

- Source: https://appshunter.io/ios/app/curtain-calc-pro/id6770147174 (this page in markdown: same URL + `.md`)
- Developer: [晓 郭](https://appshunter.io/developer/1895645928)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-05-18
- Data updated: 2026-06-02
- User reviews in markdown: https://appshunter.io/ios/app/curtain-calc-pro/id6770147174/reviews.md

## What is Curtain Calc Pro?

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.


## Version history (last 1 release)

### 1.0 — 2026-05-18

No release notes.

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All apps by 晓 郭: https://appshunter.io/developer/1895645928

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-02.*