# Ruler, Measuring Tape vs Comtarsia Authenticator

The clearest difference is in-app purchases: Comtarsia Authenticator at none against Ruler, Measuring Tape's 6. Comtarsia Authenticator also leads on ads (none vs shown) and iOS requirement (12.4 vs 16.6). Ruler, Measuring Tape's advantage is update cadence (monthly vs every 63 months). On price and device support there is nothing between them.

Both are free to download. Ruler, Measuring Tape sells 6 in-app purchases, starting at $2.99 per 7 days. Comtarsia Authenticator asks for nothing beyond the download.

Ruler, Measuring Tape ships an update monthly, Comtarsia Authenticator every 63 months. The most recent releases landed on October 26, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Ruler, Measuring Tape | Comtarsia Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (1K ratings)](https://appshunter.io/ios/app/ruler-measuring-tape-ar-app/id1462163605/reviews)** | — |
| Number of ratings | **1K** | — |
| Positive reviews | 23.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 63 months |
| Monetization | Free with in-app purchases | — |
| Size | 52 MB | 2 MB |
| Requires iOS | 16.6 | **12.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [WHATSTICKER APPS SRL](https://appshunter.io/developer/1784779333) | [Comtarsia IT Services GmbH](https://appshunter.io/developer/1538437597) |

## What reviewers say

### Ruler, Measuring Tape

[App page](https://appshunter.io/ios/app/ruler-measuring-tape-ar-app/id1462163605)

This app turns your device into a versatile ruler and tape measure using advanced AR technology. It offers precise measurements for objects, rooms, and complex shapes, along with unit conversion and a history log. Ideal for professionals and everyday users needing accurate measurements.

**Highlights:** AR ruler and tape measure, Length and distance measurement, Unit converter (mm, inches, cm), Rectangle, cube, circle, cylinder measurements, Polylines for complex shapes, Angle measurement, Measurement history

**Features:** Family Sharing, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly premium with trial | $2.99 | per 7 days |
| Weekly premium | $2.99 | per 7 days |
| Yearly premium with trial | $29.99 | per year |
| Yearly premium | $29.99 | per year |
| No more ads | $1.99 | one-time |
| Unlock all AR features | $5.99 | one-time |

**What reviewers like**

- 🚀 Accurate measurements
- 👍 Simple and intuitive interface
- 🔒 No ads in free version
- ✨ Handy and useful tool

**What reviewers complain about**

- 🐛 Inaccurate measurements on some devices
- 💰 Subscription required for full functionality
- 🔒 Forced ads in free version
- 🔒 Privacy concerns with data sharing

**Reported bugs**

- Unable to close or exit the app
- Crashes on certain iOS versions
- AR mode displays only in cm

**Requested features**

- Option to set default unit (inches or cm)
- Ability to save and recall past measurements
- Decimal inch display alongside fractional
- Millimeter measurement option


### Comtarsia Authenticator

[App page](https://appshunter.io/ios/app/comtarsia-authenticator/id1538437355)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ruler, Measuring Tape free?

Ruler, Measuring Tape is free to download, with in-app purchases available.

### Is Comtarsia Authenticator free?

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

### Do Ruler, Measuring Tape or Comtarsia Authenticator have ads?

Ruler, Measuring Tape shows ads; Comtarsia Authenticator does not.

### Which is updated more often, Ruler, Measuring Tape or Comtarsia Authenticator?

Ruler, Measuring Tape ships an update monthly, and Comtarsia Authenticator every 63 months. Most recently, Ruler, Measuring Tape was updated on October 26, 2026 and Comtarsia Authenticator 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.*