# Pace Ruler vs ATN Obsidian 4

The clearest difference is rating: Pace Ruler at 2.6 against ATN Obsidian 4's 2.0. Pace Ruler also leads on review sentiment (39% vs 16%). ATN Obsidian 4's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Pace Ruler sells 1 one-off in-app purchase. ATN Obsidian 4 asks for nothing beyond the download.

Pace Ruler holds the better App Store score, 2.6 against 2.0. That said, the two scores are not equally well evidenced: ATN Obsidian 4 has 234 ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 39% of Pace Ruler's written reviews are positive against 16% of ATN Obsidian 4's.

Pace Ruler ships an update every 6 months, ATN Obsidian 4 every 3 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Pace Ruler | ATN Obsidian 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.6 (15 ratings)](https://appshunter.io/ios/app/pace-ruler/id588276050/reviews)** | [2.0 (234 ratings)](https://appshunter.io/ios/app/atn-obsidian-4/id1337731256/reviews) |
| Number of ratings | 15 | **234** |
| Positive reviews | **39.3% of reviews** | 16.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 5 MB | 85 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takafumi AMANO](https://appshunter.io/developer/581065340) | [ATN](https://appshunter.io/developer/789970891) |

## What reviewers say

### Pace Ruler

[App page](https://appshunter.io/ios/app/pace-ruler/id588276050)

This tool uses GNSS to measure distances accurately on foot. Survey results can be viewed on an iOS map and shared easily. Customize units, calculation methods, and accuracy settings for precise measurements.

**Highlights:** GNSS distance surveying, iOS map integration, File sharing of results, Customizable units (meter, foot), Multiple distance calculation methods, Adjustable GNSS accuracy, Automatic shut-off

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### ATN Obsidian 4

[App page](https://appshunter.io/ios/app/atn-obsidian-4/id1337731256)

Connect your smartphone or tablet to compatible ATN smart scopes via WiFi. Stream live video of your hunt, adjust device settings, and review recorded images and videos. Unlock the full capabilities of your ATN optics.

**Highlights:** Live video streaming, Device settings adjustment, Review stored media, WiFi connectivity, Enhances ATN optic experience

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Fast live streaming
- 👍 Easy scope configuration
- 🔍 Useful viewfinder feature

**What reviewers complain about**

- 🐛 Frequent connection issues
- 🐛 App crashes and freezes
- 🐛 Unreliable video/photo gallery
- 🐛 Scope locking up when using app

**Reported bugs**

- App unable to discover scope
- Live view not working as expected
- Scope firmware updates causing issues

**Requested features**

- Add photo/video gallery to view media
- Improve app stability and reliability
- Allow profile editing directly on scope


## Frequently asked questions

### Is Pace Ruler free?

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

### Is ATN Obsidian 4 free?

ATN Obsidian 4 is free to download, with no in-app purchases.

### Which has better reviews, Pace Ruler or ATN Obsidian 4?

Pace Ruler is rated higher. Pace Ruler averages 2.6 out of 5 from 15 ratings, while ATN Obsidian 4 averages 2.0 from 234 ratings.

### Do Pace Ruler or ATN Obsidian 4 have ads?

Pace Ruler shows ads; ATN Obsidian 4 does not.

### Which is updated more often, Pace Ruler or ATN Obsidian 4?

Pace Ruler ships an update every 6 months, and ATN Obsidian 4 every 3 months. Most recently, Pace Ruler was updated on October 23, 2026 and ATN Obsidian 4 on October 24, 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.*