Screen Ruler vs Ruler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Screen Ruler
Turn your iPhone or iPad into a precise measuring tool. Easily measure lengths in centimeters or inches with features like magnifier mode and haptic feedback. Ideal for daily tasks, office use, DIY projects, and on-the-go measurements.
- Dual units (cm/inches)
- Precision calibration
- Magnifier mode
- Haptic feedback
- Clean interface
- Save and label measurements
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Turn your iPhone or iPad into a calibratable digital ruler for measuring small objects directly on the screen. Screen Ruler supports centimeters and inches, magnifier-assisted alignment, and haptic feedback. Measure Small Objects on Your Screen Use Screen Ruler for stationery, frames, craft materials, and other small objects that fit along your device screen. Place the object directly on the screen, move the measurement marks to its edges, and read the length. Core Features • Calibratable ruler: Match the scale to an object of known length and save calibration for your device. • CM and inch scales: Switch between centimeters and inches for everyday measurements. • Magnifier assist: Align measurement marks with object edges more confidently. • Haptic feedback: Feel subtle feedback while adjusting the marks. How to Get More Reliable Results For best results, place the object directly on the screen and check the scale against a known length. Calibrate the ruler if you notice an offset. Accuracy and Limitations Screen Ruler is designed for short, everyday measurements. Accuracy depends on device calibration, screen placement, and how precisely the marks are aligned. It does not use the camera or AR and is not intended for measuring rooms or large objects. Feedback: ankek1er@gmail.com
Ruler
Measure objects and distances with an on-screen ruler and augmented reality. Supports inches and centimeters, with features for linear sizes, angles, area, volume, and more. Save your measurements for later use.
- On-screen ruler for small objects
- Augmented Reality (AR) measuring
- Measure linear sizes in cm/inches
- Calculate angles, area, and volume
- Save measurements
- Generate plan projections
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Measure everything with a beautiful on-screen ruler. Choose between inches and centimeters. Tap the screen to start using the best multi-touch measuring system and find the size of all curious objects around you. Also with your camera measure everything accurate by using Augmented Reality (AR) feature. 1) Allows to tape measure linear sizes in cm, inches 2) With Bubble meter allows you to level objects horizontal 3) Save measurments 4) Allows to tape measure distance from device camera to a fixed point on the detected 3D plane. 5) Angle – allows to tape measure corners on 3D planes. 6) Area and Perimeter – allows to tape measure perimeter and area of the room. 7) Volume – allows to tape measure size of 3D objects. 8) Path – allows to calculate the length and area of the path. 9) Height – allows to tape measure height relative to the recognized surface. 10) Plan – generates plan projection for drawn objects and exports it . 11) On-screen Ruler app – measure small objects directly on the smartphone’s screen.
Screenshots
Verdict
The clearest difference is review sentiment: Screen Ruler at 55% against Ruler's 15%. Screen Ruler also leads on update cadence (every 3 months vs every 14 months). Ruler's advantage is rating (4.2 vs 3.7) and in-app purchases (none vs 2). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Screen Ruler sells 2 one-off in-app purchases. Ruler asks for nothing beyond the download.
Ruler holds the better App Store score, 4.2 against 3.7. That said, the two scores are not equally well evidenced: Ruler has 419 ratings behind it against 26, so its average is the more settled of the two. Written reviews complicate that: 55% of Screen Ruler's written reviews are positive against 15% of Ruler's, so the app with the better star average is not the one people write more warmly about.
Screen Ruler ships an update every 3 months, Ruler every 14 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.
| Parameter | Screen Ruler | Ruler |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (26 ratings) | 4.2 (419 ratings) — better |
| Positive reviews | 54.8% of reviews — better | 15.2% of reviews |
| Number of ratings | 26 | 419 — better |
| Update frequency | Every 3 months — better | Every 14 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 18 MB | 6 MB |
| Age rating | +4 | 4+ |
| Developer | 向阳 杨 | Matrix Software Co. |
Customer experience
Screen Ruler
Ruler
Bugs and requests
Screen Ruler
Not enough reviews yet to summarise bugs or requests.
Ruler
Reported bugs
8 issues- App crashes on iPhone 17 and iPad
- App crashes within 1 minute
- AR mode not functional
- Cannot switch to cm
- Measurements are out of scale
Show 3 moreShow fewer
- Centimeter measurement is wrong
- Ruler markings are wrong (10ths instead of 16ths)
- iPhone 14 Pro Max measured as over 9 inches
Requested features
7 requests- Fix crashing issues
- Enable switching to metric (cm)
- Improve AR mode usability
- Add save and print functionality
- Provide usage instructions
Show 2 moreShow fewer
- Ensure accurate scaling for all devices
- Fix ruler marking divisions
In-app purchases
Screen Ruler
- Ads-free experience$1.99
- Support for a cup of coffee$2.99
Ruler
No in-app purchases






