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Screenshots

  • Ruler - Scale Ruler screenshot 1
  • Ruler - Scale Ruler screenshot 2
  • Ruler - Scale Ruler screenshot 3
  • Ruler - Scale Ruler screenshot 4

About Ruler - Scale Ruler

Scale Ruler is the simple application to display the scale of various measurement units. ※ Warning: - The accuracy of the scales cannot be guaranteed. - Calibration and PPI values ​​will be reset when the model changes. - Set the PPI value only when the model is undecided. - When you change the PPI value, perform calibration after the change. ■How to use: ■Select mode In UNLOCKED state, after choosing measurement unit, magnification ratio and reduced scale, the scale is displayed. ■Free mode When dragging the screen at UNLOCK, you can set the scale in the range 1: 1 to 1: 100. When you press and hold the scale value, the keyboard is displayed and you can enter the scale. You can lock the scale on the ruler with a switch. Sorry for the advertisement during unlocking. After In-App Purchase, your ads will no longer be displayed. Specification of Scale Ruler - measure length meter,inches - magnification ratio 50% , 70.7% , 100% , 141% , 200% - reduced scale  for meter    1:100 , 1:150 , 1:200 , 1:250 , 1:300 , 1:400 , 1:500 , 1:600  for inch   1:1 , 1:1.5 , 1:2 , 1:2.5 , 1:3 , 1:4 , 1:5 , 1:6  for inch(Architectural)   1:1 , 1:2 , 1:4 , 1:8 , 1:12 , 1:16 , 1:24 , 1:32 , 1:48 , 1:64   1:96 , 1:128 , 1:192 , 1:384  for inch(Engineering) 1:120 , 1:240 , 1:360 , 1:480 , 1:600 , 1:720 1:800 , 1:960 , 1:1080 ■ Settings - Calibration - PPI (pixels per inch) setting - In-app purchase (ads not displayed) - In-app purchase restoration ■ Calibration Adjust the length of the ruler. Use the correct ruler for adjustment. "Calibration" button: Records the adjusted state and reflects the calibration result on the ruler. "Reset" button: Returns the adjustment status to the specified value. It will not be recorded. "Initialize" button: Returns the adjustment status to the specified value and reflects it on the ruler. * Caution: The calibration value will be reset when the model changes. ■ PPI (pixels per inch) setting If the model is undecided, check the PPI value of the model before setting the PPI value. * Please set only when the model is undecided. "OK" button: Record the entered PPI value and reflect it on the ruler display. "Initialize" button: Returns the PPI value to the specified value and reflects it on the ruler. * Caution: The PPI value will be reset when the model changes.

What’s new

Version 4.7 · Updated March 19, 2026

Update for iPhone17e ,iPad Air 11-inch(M4),iPad Air 13-inch(M4).

App privacy

The developer, mitsunori oishi, reported these privacy practices to Apple.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Location: Coarse Location
  • Identifiers: Device ID
  • Usage Data: Product Interaction, Advertising Data
  • Diagnostics: Crash Data, Performance Data

Data Linked to You

The following data, which may be collected and linked to your identity, may be used for the following purposes:

  • Location: Coarse Location
  • Identifiers: Device ID
  • Usage Data: Product Interaction, Advertising Data
  • Diagnostics: Crash Data, Performance Data

Used for: Third-Party Advertising

Alternatives to Ruler - Scale Ruler

Looking for apps like Ruler - Scale Ruler? Here are 6 similar apps on the App Store. The highest rated is Construction Calculator A1 (4.8/5), and all 6 are free to download.

Ruler - Scale Ruler vs. alternatives
App Rating Price Last updated
Ruler - Scale Ruler 3.7 / 5 (3 ratings) Free March 19, 2026
100cm Ruler 4.0 / 5 (1) Free Oct 20, 2024
Ruler - Accurate Ruler 2.7 / 5 (40) Free Apr 8, 2025
Screenshot Pixel Measure Tool 4.1 / 5 (28) Free Apr 20, 2026
Construction Calculator A1 4.8 / 5 (26) Free Aug 30, 2026
Tape Measure Camera Ruler 3D 4.2 / 5 (774) Free Sep 18, 2026
Construction Calc Pro 7 4.3 / 5 (28) Free May 30, 2026