Ruler
Ruler has 32,760,354 installs (+0.5% in 30 days), rated 4.3 from 115,748 ratings, #400 of 248,709 in Tools.
Description
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Measure anything with your phone easily and accurately.
Ruler App turns your smartphone into a simple and reliable measurement tool. Use it at home, at work, or for school. Quickly measure objects, lines, and angles with ease.
Features:
📏 Digital ruler and tape measure – measure length and size directly on your screen
📱 Screen ruler – convenient for quick measurements
🔢 Unit converter – switch between inches, centimeters, and millimeters
📐 Measure objects and lines – check distance, width, or diameter
⚙️ Caliper mode – precise measurements for small objects
📊 Protractor – measure angles up to 360°
🛠 Multiple modes – point, line, level, and screen measurement
Benefits:
✅ Fast and accurate results
✅ Easy to calibrate and use
✅ Clear, simple interface
✅ Useful for DIY projects, school, office, and everyday tasks
This all-in-one measurement app helps you measure length, distance, and angles whenever you need. Keep a digital ruler and tape measure always in your pocket.
Is Ruler safe?
StoreTally doesn't rate safety. Here's what the store and our tracking show:
Reviews The reviews Google Play shows first (its most relevant), from the US store, in any language.
From 115,702 ratings.
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★★★★★ Thomas Kirk (Ikon64) · 9 Nov 2026 · v10.1-releaseI initially didn't realize just how good of a ruler app this was, but after playing around with it, you'll see that it has a lot of flexibility in the way it goes about measuring things. Also works very well with foldable phones , giving you that much more of an area to measure with. Definitely a keeper on my phone!
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★★★★★ Ronna Abadilla · 5 Nov 2026 · v10.1-releaseVery convenient. I often lose my ruler because I don't use them as much after graduating. It's witty that they use credit card length as the calibration. Once calibrated, everything is accurate.Developer reply · 5 Nov 2026Thank you for the thoughtful feedback! We’re glad the calibration method was convenient and helped you achieve accurate measurements.
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★★★★★ Aaron Stump · 4 Nov 2026 · v10.1-releasematches up very accurately with a real world ruler, although my screen size being a limit for the rulers length is inconvenient it works as it shouldDeveloper reply · 5 Nov 2026Thank you for the detailed feedback! We’re pleased with the accuracy you experienced and appreciate your note about the measurement range.
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★☆☆☆☆ Ross Baldwin · 31 Oct 2026 · v10.1-releaseNon-GDPR compliant. I'm not going to wade through hundreds of vendors turning off legitimate interest separately for each one. Promptly uninstalled. (and in case the developer replies saying it's "standard", it may well be but it's still NOT gdpr compliant. Cookie consent MUST NOT be more difficult to reject non-essential cookies than to accept them, and they MUST NOT be enabled by default. Other websites and apps can do it correctly, so you can too. Fix that and I'll reinstall the app 🙂)
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★★★★★ Anoop Suresh · 30 Oct 2026 · v10.0-releaseSimple UI. Does an excellent job for small measurements. Not for AR based big area measurements.
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★★★★★ Dany · 21 Oct 2026 · v10.0-releaseGreat and excellent tool for measurement of things that you might encounter in our daily life.. Such as getting the circumference of a circle without a caliper around, can be use as a protractor when you need one and so on... What a great tool to have in your smartphone! Easy to convert imperial to metric just in one click. I Highly recommended this app!
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★★☆☆☆ theotherguy7145 · 20 Oct 2026 · v10.0-releaseUnusable due to aggressive ads immediately.
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★★★★☆ Ednel Christi Q De Asis · 20 Oct 2026 · v10.0-releasewould be nice if "mm" option could be in the UI, and not having to go to settings all the time.
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★★★★★ Ishant Jaiswal · 20 Oct 2026 · v10.0-releaseThis app is fantastic and ad-free; it’s truly a blessing for engineers.
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★★★★★ Md.Tasnim Jaman · 19 Oct 2026 · v10.0-releasei found it useful. when install first callibrate the inch or centimetres with the scale or rular and know the coefficient then it will provide original scale result..
Growth change in installs
| Per | Growth | Growth % | Actual change | Measured over |
|---|---|---|---|---|
| day | Not enough history yet | |||
| week | +41,462 | +0.1% | +43,082 | 7.3 days |
| month | +148,592 | +0.5% | +156,317 | 31.6 days |
| year | Not enough history yet | |||
How these figures are measured
Change in installs, scaled to each window from the real gap between crawls. A window needs a full period of history before it reports anything.
Alternatives to Ruler
| Name | Installs | Rating |
|---|---|---|
Tape Measure: Measuring Ruler
by Grymala apps
|
39,766,894 | 4.2 |
AR Ruler App: Tape Measure Cam
by Grymala apps
|
24,280,156 | 3.8 |
Ruler App: Measure centimeters
by Nikola Kosev
|
10,256,895 | 4.5 |
Smart Ruler
by Smart Tools co.
|
4,096,592 | 3.6 |
Measure With AR Ruler
by Akihabara Apps Solutions
|
2,678,521 | 2.9 |
Ruler, Level tool, Measure
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|
2,523,760 | 3.5 |
Metal Detector, Ruler, Decibel
by Lo Li
|
1,793,270 | 3.4 |
AR Measure Plan: 3D Tape Ruler
by One Music Player
|
1,398,174 | 2.9 |
Ruler Cm
by Sweetvrn
|
1,364,025 | 4.0 |
Ruler, BubbleLevel, AngleMeter
by 1 Bit
|
1,315,753 | 4.0 |
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