# Ruler vs Caliper&Ruler

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.

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.

## The numbers

| Metric | Ruler | Caliper&Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (419 ratings)](https://appshunter.io/ios/app/ruler/id1555214809/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caliper-and-ruler/id6749051381/reviews)** |
| Number of ratings | **419** | 1 |
| Positive reviews | 15.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Every 6 weeks** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 6 MB | 5 MB |
| Requires iOS | **13.0** | 18.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Matrix Software Co.](https://appshunter.io/developer/1457004046) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### Ruler

[App page](https://appshunter.io/ios/app/ruler/id1555214809)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Basic caliper and spirit level included
- ✅ Option to opt-out of data selling/sharing
- 👌 Accurate measurements (Arabic review)

**What reviewers complain about**

- 📏 Inaccurate measurements
- 💥 Frequent app crashes
- 💸 Limited free functionality (5" limit)
- 🚫 Cannot switch to metric (cm)
- 🤷 Unclear AR mode usage

**Reported bugs**

- 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

**Requested features**

- Fix crashing issues
- Enable switching to metric (cm)
- Improve AR mode usability
- Add save and print functionality
- Provide usage instructions


### Caliper&Ruler

[App page](https://appshunter.io/ios/app/caliper-and-ruler/id6749051381)

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.

**Highlights:** Dual measurement units (inches/millimeters), Intuitive drag-and-measure interface, Accurate screen calibration, Custom calibration options, Universal device compatibility

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Ruler free?

Ruler is free to download, with no in-app purchases.

### Is Caliper&Ruler free?

Caliper&Ruler is free to download, with in-app purchases available.

### Which has better reviews, Ruler or Caliper&Ruler?

Caliper&Ruler is rated higher. Ruler averages 4.2 out of 5 from 419 ratings, while Caliper&Ruler averages 5.0 from 1 ratings.

### Do Ruler or Caliper&Ruler have ads?

Ruler shows ads; Caliper&Ruler does not.

### Which is updated more often, Ruler or Caliper&Ruler?

Ruler ships an update every 14 months, and Caliper&Ruler every 6 weeks. Most recently, Ruler was updated on October 27, 2026 and Caliper&Ruler on October 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*