Ruler vs Caliper&Ruler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Caliper&Ruler
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.
- Dual measurement units (inches/millimeters)
- Intuitive drag-and-measure interface
- Accurate screen calibration
- Custom calibration options
- Universal device compatibility
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Unlock Precision – Your Essential On-Screen Measurement Tool! Turn your iPhone or iPad into a versatile digital caliper. Measure objects accurately in inches and millimeters with an intuitive and easy-to-use interface. Whether you're a DIY enthusiast, student, designer, or professional, Caliper provides precise measurements wherever you need them. Key Features: - Dual Measurement Units: Easily measure in both inches and millimeters. - Intuitive Drag-and-Measure: Simply drag the slider to measure objects instantly. - Accurate Calibration: Calibrate your screen using everyday objects such as credit cards, AA batteries, rulers, or CDs/DVDs/Blu-ray discs. - Custom Calibration: Use any object with a known length for precise adjustment. - Universal Compatibility: Designed for iPhone (landscape only) and iPad (all orientations). Download Caliper and experience accurate measurements anytime, anywhere.
Screenshots
Verdict
The clearest difference is rating: Caliper&Ruler at 5.0 against Ruler's 4.2. Caliper&Ruler also leads on ads (none vs shown) and update cadence (every 6 weeks vs every 14 months). Ruler's advantage is in-app purchases (none vs 1) and ratings volume (419 vs 1). On price 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. Caliper&Ruler sells 1 one-off in-app purchase. Ruler asks for nothing beyond the download.
Caliper&Ruler holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Ruler has 419 ratings behind it against 1, so its average is the more settled of the two.
Ruler ships an update every 14 months, Caliper&Ruler every 6 weeks. The most recent releases landed on October 27, 2026 and October 12, 2026 respectively.
| Parameter | Ruler | Caliper&Ruler |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (419 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 15.2% of reviews | — |
| Number of ratings | 419 — better | 1 |
| Update frequency | Every 14 months | Every 6 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.4 |
| Further details — not scored | ||
| Size | 6 MB | 5 MB |
| Age rating | 4+ | +4 |
| Developer | Matrix Software Co. | Jun Yamabe |
Customer experience
Ruler
Caliper&Ruler
Bugs and 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
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- 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
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- Ensure accurate scaling for all devices
- Fix ruler marking divisions
Caliper&Ruler
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ruler
No in-app purchases
Caliper&Ruler
- Remove Ads$2.99








