Best Mm Ruler Apps

244+ iOS apps curated and reviewed

4.2 avg rating
20 free apps
Updated October 2026

The best mm ruler apps on iPhone average 4.2โ˜… across 244+ titles โ€” we've ranked them by what real users actually keep on their phones. Updated October 2026.

Compare top Mm Ruler Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Ruler - CM, MM, InchesRuler - CM, MM, InchesFree3.5โ˜… (79)YesNoNov 2026
2Caliper&RulerCaliper&RulerFree5.0โ˜… (1)NoYesOct 2026
3Ruler 2.0 - inch, mm, cmRuler 2.0 - inch, mm, cmFree3.9โ˜… (205)NoNoOct 2026
4RulerยฎRulerยฎFree4.3โ˜… (35K)NoYesNov 2026
5Ruler: CM, MM & InchesRuler: CM, MM & InchesFree5.0โ˜… (2)YesYesOct 2026
6Ring Sizer & Tape MeasureRing Sizer & Tape MeasureFree4.1โ˜… (37)YesYesOct 2026
7Ruler: Measuring Tape.Ruler: Measuring Tape.Free5.0โ˜… (5)NoYesOct 2026
8Ruler & Tape Measure โ€“ AR ToolRuler & Tape Measure โ€“ AR ToolFreeโ€”YesYesOct 2026

Top Picks for Mm Ruler

Ruler - CM, MM, Inches#1

Ruler - CM, MM, Inches by Noadit, Inc.

CM, MM, In. Measure Anything.
Editor's Choice
๐Ÿ”ง Utilities
3.5๐Ÿ˜ž(79 ratings)
FreeAds
Ruler - CM, MM, Inches screenshot 1
Ruler - CM, MM, Inches screenshot 2
Ruler - CM, MM, Inches screenshot 3

Measure lengths, widths, and diagonals accurately using your phone. Switch between metric and imperial units, and utilize flexible starting points for precise measurements in any direction. Features auto-calibration for minimal error and a screen lock to preserve readings.

What We Love

  • ๐Ÿ‘ Simple and easy to use
  • ๐Ÿ“ Accurate measurements (for some)
  • ๐Ÿ’ก Useful for small objects
  • โœจ Clean interface
  • ๐Ÿš€ Fluid performance
  • ๐Ÿ› ๏ธ Good basic functionality

Room to Improve

  • ๐Ÿ˜  Excessive and intrusive ads
  • ๐Ÿšซ Ads block measurements
  • ๐Ÿ”Š Loud and shocking ads
  • ๐Ÿ’ธ No option to pay for ad-free (or purchase lost)
  • ๐Ÿ“‰ Inaccurate inch measurements (decimal vs. fractional)
  • โš ๏ธ Shady download practices
  • โšซ Black screen issue
  • ๐Ÿ‘† Finger obscures measurements
  • ๐Ÿ“ฑ Inaccurate on specific devices
  • ๐Ÿ‘Ž Lost paid features after update
Caliper&Ruler#2

Caliper&Ruler by Jun Yamabe

Measure & Calibrate with Ease.
Strong Contender
๐Ÿ”ง Utilities
5.0(1 ratings)
FreeIn-App Purchases
Caliper&Ruler screenshot 1
Caliper&Ruler screenshot 2
Caliper&Ruler screenshot 3
Caliper&Ruler screenshot 4
Caliper&Ruler screenshot 5

Transform your device into a precise digital caliper for measuring objects in inches and millimeters. Features intuitive drag-and-measure functionality and accurate screen calibration using common items.

Ruler 2.0 - inch, mm, cm#3

Ruler 2.0 - inch, mm, cm by Oleg Osipov

High measurement accuracy
Worth Considering
๐Ÿ”ง Utilities
3.9๐Ÿ˜ž(205 ratings)
Free
Ruler 2.0 - inch, mm, cm screenshot 1
Ruler 2.0 - inch, mm, cm screenshot 2
Ruler 2.0 - inch, mm, cm screenshot 3
Ruler 2.0 - inch, mm, cm screenshot 4
Ruler 2.0 - inch, mm, cm screenshot 5

This app provides a precise on-screen measuring tool for your iPhone or iPad. Easily measure length and width in centimeters, millimeters, or inches, with options to save measurements as photos and customize the ruler's appearance. It's designed for accurate, user-friendly measurements.

What We Love

  • ๐Ÿ‘ Simple and easy to use
  • ๐Ÿ’ก Precise measurements (when working)
  • โœจ Free with no ads
  • โœ… Lightweight and small size
  • ๐ŸŽฏ Good for small item measurements

Room to Improve

  • ๐Ÿ› Frequent crashes
  • ๐Ÿ“ Inaccurate measurements on newer phones
  • ๐Ÿ“ฑ Not optimized for high DPI screens
  • ๐Ÿ“‰ Scale is off by ~50% on newer models
  • โš ๏ธ Support link is shady

More Mm Ruler apps to explore

FAQ about Mm Ruler

What are the best mm ruler apps for iPhone?
Ruler - CM, MM, Inches tops our mm ruler apps ranking as of October 2026, with a 3.5-star average from 79 App Store ratings, and it's free to download.
Yes โ€” 20 of the top mm ruler apps we rank are free to download, including Ruler - CM, MM, Inches and Caliper&Ruler.
Ruler - CM, MM, Inches shows ads and has no in-app purchases, according to its App Store listing as of October 2026.
We track 244+ mm ruler apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.

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