Best Mm Ruler Free Apps

250+ iOS apps curated and reviewed

4.1 avg rating
20 free apps
Updated October 2026

If you already know Ruler, this is the deeper bench. 250+ mm ruler free apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of October 2026.

Compare top Mm Ruler Free Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Ruler - CM, MM, InchesRuler - CM, MM, InchesFree3.5★ (79)YesNoNov 2026
2Ruler: CM, MM & InchesRuler: CM, MM & InchesFree5.0★ (2)YesYesOct 2026
3Ruler®Ruler®Free4.3★ (35K)NoYesNov 2026
4Ruler 2.0 - inch, mm, cmRuler 2.0 - inch, mm, cmFree3.9★ (205)NoNoOct 2026
5Screen Ruler: Measure LengthScreen Ruler: Measure LengthFree3.7★ (26)YesYesOct 2026
6Measure Tape: Distance Tool.Measure Tape: Distance Tool.Free—YesYesOct 2026
7TrueRuler: Pocket RulerTrueRuler: Pocket RulerFree—NoNoSep 2026
8Ruler •Ruler •Free4.2★ (421)YesNoNov 2026

Top Picks for Mm Ruler Free

Ruler - CM, MM, Inches#1

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

CM, MM, In. Measure Anything.
Editor's Choice
🔧 Utilities
3.5😞(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

  • 👍 Simple and easy to use
  • 📏 Accurate measurements (for some)
  • 💡 Useful for small objects
  • ✨ Clean interface
  • 🚀 Fluid performance
  • 🛠️ Good basic functionality

Room to Improve

  • 😠 Excessive and intrusive ads
  • 🚫 Ads block measurements
  • 🔊 Loud and shocking ads
  • 💸 No option to pay for ad-free (or purchase lost)
  • 📉 Inaccurate inch measurements (decimal vs. fractional)
  • ⚠️ Shady download practices
  • ⚫ Black screen issue
  • 👆 Finger obscures measurements
  • 📱 Inaccurate on specific devices
  • 👎 Lost paid features after update
Ruler: CM, MM & Inches#2

Ruler: CM, MM & Inches by Tianyu Lu

Measure Length & Caliper Tool
Strong Contender
🔧 Utilities
5.0(2 ratings)
FreeAdsIn-App Purchases
Ruler: CM, MM & Inches screenshot 1
Ruler: CM, MM & Inches screenshot 2
Ruler: CM, MM & Inches screenshot 3
Ruler: CM, MM & Inches screenshot 4
Ruler: CM, MM & Inches screenshot 5
Ruler: CM, MM & Inches screenshot 6

This app provides a highly accurate, actual-size ruler that adapts to any screen. It offers dual-edge measurement, a precision caliper mode, and universal calibration for reliable real-world measurements. It functions offline and is designed for various devices.

Ruler®#3

Ruler® by Tue Nguyen Minh

+ Photo Ruler & AR Measure
Worth Considering
🔧 Utilities
4.3😞(35K ratings)
FreeIn-App Purchases
Ruler® screenshot 1
Ruler® screenshot 2
Ruler® screenshot 3
Ruler® screenshot 4

This app provides a versatile toolkit for all your measurement needs. It includes a classic ruler, a tape measure, and a camera ruler for precise measurements. Easily switch between units and document your findings by adding measurements directly to photos.

What We Love

  • 🚀 Accurate measurements
  • 👍 Easy to use
  • 🔍 Convenient for small items
  • 📏 Useful ruler tool

Room to Improve

  • 💰 Paywall for basic features
  • ⏱️ Limited free usage time
  • 🔍 Inaccurate for larger objects
  • 🙅‍♀️ Aggressive monetization tactics

More Mm Ruler Free apps to explore

FAQ about Mm Ruler Free

What are the best mm ruler free apps for iPhone?
Ruler - CM, MM, Inches tops our mm ruler free apps ranking as of October 2026, with a 3.5-star average from 79 App Store ratings, and it's free to download.
Ruler - CM, MM, Inches shows ads and has no in-app purchases, according to its App Store listing as of October 2026.
We track 250+ mm ruler free apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.