# Sonar Ruler vs 1Extn

The clearest difference is price: Sonar Ruler at Free against 1Extn's $1.99. Sonar Ruler also leads on in-app purchases (none vs 1). 1Extn's advantage is rating (4.6 vs 2.7) and update cadence (weekly vs every 105 months). On ads and monetization model there is nothing between them.

Sonar Ruler is free to download; 1Extn costs $1.99 up front. 1Extn sells 1 one-off in-app purchase. Sonar Ruler asks for nothing beyond the download.

1Extn holds the better App Store score, 4.6 against 2.7. That said, the two scores are not equally well evidenced: 1Extn has 24 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 43% of Sonar Ruler's written reviews are positive against 64% of 1Extn's.

Sonar Ruler ships an update every 105 months, 1Extn weekly. The most recent releases landed on November 10, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Sonar Ruler | 1Extn |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/sonar-ruler/id324621243/reviews) | **[4.6 (24 ratings)](https://appshunter.io/ios/app/1extn-extensions-and-shortcuts/id1599406759/reviews)** |
| Number of ratings | 3 | **24** |
| Positive reviews | 43.5% of reviews | **63.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 105 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 5 MB | 3 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Laan Labs](https://appshunter.io/developer/310916919) | [Charles Kautsire](https://appshunter.io/developer/867911324) |

## What reviewers say

### Sonar Ruler

[App page](https://appshunter.io/ios/app/sonar-ruler/id324621243)

This experimental app uses your iPhone's speaker to send out sonic pulses and measures the echo to estimate distances up to 60 feet. It's a fun and innovative way to explore sonar principles, perfect for educational purposes or impressing friends with unique iPhone capabilities.

**Highlights:** Sonic distance measurement, Up to 60 feet range, Selectable units (feet, inches, meters), Custom saved settings, Educational sonar demonstration

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💡 Innovative sonar technology using iPhone hardware
- 🎯 Accurate measurements when used correctly (±0.5-1 inch)
- 📚 Educational value for learning sound principles
- 🎮 Fun novelty app for impressing friends
- ⚙️ Customizable settings for different environments

**What reviewers complain about**

- 🐛 Crashes immediately on many iPhone models
- ❌ Doesn't work on older iPhone generations (iPhone 4, 4S, 5)
- 🔊 Highly sensitive to background noise and interference
- 😕 Steep learning curve and unintuitive interface
- ⚠️ Inconsistent and unreliable measurements

**Reported bugs**

- App crashes within 3 seconds of opening on iPhone 6 and older models
- Won't open on iOS 8.4 and later versions
- No chirping sound emitted on some devices
- Feedback loop and screaming noise on certain hardware
- Phone locks up requiring hard restart

**Requested features**

- Room mapping by rotating phone in circle
- Vertical distance measurement capability
- Better ambient noise filtering
- Clearer, more intuitive user interface
- Optimized default settings (frequency, filter, chirp)


### 1Extn

[App page](https://appshunter.io/ios/app/1extn-extensions-and-shortcuts/id1599406759)

Enhance your mobile browsing with custom tools and automation. Create QR codes, translate pages, search websites with keywords, and personalize web appearances. Includes an HTML game viewer and optional AI assistance for creating features.

**Highlights:** Customizable browsing tools, Website search shortcuts, Link redirects, Page automation, Script editor, HTML game viewer, AI-powered feature creation

**Features:** Safari Extension

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Optional Support Tip | $2.99 | one-time |


## Frequently asked questions

### Is Sonar Ruler free?

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

### Is 1Extn free?

1Extn costs $1.99, and also offers in-app purchases.

### Which has better reviews, Sonar Ruler or 1Extn?

1Extn is rated higher. Sonar Ruler averages 2.7 out of 5 from 3 ratings, while 1Extn averages 4.6 from 24 ratings.

### Do Sonar Ruler or 1Extn have ads?

Neither Sonar Ruler nor 1Extn shows ads.

### Which is updated more often, Sonar Ruler or 1Extn?

Sonar Ruler ships an update every 105 months, and 1Extn weekly. Most recently, Sonar Ruler was updated on November 10, 2026 and 1Extn on November 7, 2026.

---

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