# ScreenRuler - Measure Length — Real cm & inch ruler on screen

> Real cm & inch ruler on screen (iPhone/iPad app by pilyeong heo.)

- Source: https://appshunter.io/ios/app/screenruler-measure-length/id6761749448 (this page in markdown: same URL + `.md`)
- Developer: [pilyeong heo](https://appshunter.io/developer/1835315150)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 26 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, European Portuguese, Chinese (Simplified, China), European Spanish, Thai, Chinese (Traditional, Taiwan)
- Released: 2026-04-09
- Data updated: 2026-08-25
- User reviews in markdown: https://appshunter.io/ios/app/screenruler-measure-length/id6761749448/reviews.md

## What is ScreenRuler?

Turn your iPhone into a precise ruler — no physical ruler needed.

ScreenRuler uses your device's actual pixel density (PPI) to display accurate centimeter and inch graduations directly on screen. Place any object alongside the ruler and drag two handles to measure it instantly.

HOW TO MEASURE
1. Place the object next to the left edge of the screen
2. Drag the top and bottom handles to align with the object's edges
3. Read the live measurement displayed between the handles

FEATURES
• Accurate ruler based on your iPhone's true screen PPI
• cm mode: 1 mm graduations, labeled every 1 cm
• inch mode: 1/8 inch subdivisions, labeled every 1 inch
• Two drag handles for precise range selection
• Live measurement display — updates as you drag
• Switch between cm and inch instantly
• DPI calibration using a standard credit card (short edge 5.4 cm) for extra precision
• Haptic feedback at every 1 cm / 1 inch boundary
• Dark and light theme
• Works offline — no internet required
• Collapsible control panel — stays out of the way

CALIBRATION
Every iPhone screen has a slightly different physical size. Use the built-in DPI calibration with a standard credit card to fine-tune accuracy to your exact device.

Perfect for quick measurements when you don't have a ruler on hand.


## Version history (last 1 release)

### 1.0.0 — 2026-04-09

No release notes.

## More apps by pilyeong heo

- [Running Calendar – Korea Races](https://appshunter.io/ios/app/running-calendar-korea-races/id6751476692)
- [MedicineAlarm+](https://appshunter.io/ios/app/medicinealarm-plus/id6754508416)
- [휴일 달력 - 대한민국 휴일 및 대체공휴일](https://appshunter.io/ios/app/id6757284436)
- [Korea Festivals – Events](https://appshunter.io/ios/app/korea-festivals-events/id6758883425)
- [DrinkDays – Alcohol Tracker](https://appshunter.io/ios/app/drinkdays-alcohol-tracker/id6759211087)
- [청년나침반 - 청년정책 검색](https://appshunter.io/ios/app/id6759766825)

All apps by pilyeong heo: https://appshunter.io/developer/1835315150

## Related topics

[on screen ruler](https://appshunter.io/ios/topics/on-screen-ruler)

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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 2026-08-25.*