# Flying Ruler vs Ring Sizer Tool

The clearest difference is price: Ring Sizer Tool at Free against Flying Ruler's $1.99. Ring Sizer Tool also leads on rating (4.7 vs 4.1) and ratings volume (604 vs 187). Flying Ruler's advantage is in-app purchases (none vs 1) and review sentiment (86% vs 70%). On update cadence, ads, device support and iOS requirement there is nothing between them.

Ring Sizer Tool is free to download; Flying Ruler costs $1.99 up front. Ring Sizer Tool sells 1 in-app purchase, starting at $19.99 per year. Flying Ruler asks for nothing beyond the download.

Ring Sizer Tool holds the better App Store score, 4.7 against 4.1. Both are backed by a comparable volume of ratings — 187 and 604 respectively. Written reviews complicate that: 86% of Flying Ruler's written reviews are positive against 70% of Ring Sizer Tool's, so the app with the better star average is not the one people write more warmly about.

Flying Ruler ships an update every 2 months, Ring Sizer Tool every 5 weeks. The most recent releases landed on September 23, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Flying Ruler | Ring Sizer Tool |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.1 (187 ratings)](https://appshunter.io/ios/app/flying-ruler-3d-tape-measure/id667579844/reviews) | **[4.7 (604 ratings)](https://appshunter.io/ios/app/ring-sizer-tool/id6466219535/reviews)** |
| Number of ratings | 187 | **604** |
| Positive reviews | **86.3% of reviews** | 70.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | **Paid** | Subscription |
| Size | 78 MB | 68 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ALEXEY BRILEV](https://appshunter.io/developer/667579847) | [Appcano LLC](https://appshunter.io/developer/1626754199) |

## What reviewers say

### Flying Ruler

[App page](https://appshunter.io/ios/app/flying-ruler-3d-tape-measure/id667579844)

Measure distances and angles using your device's sensors. This app functions as a ruler, tape measure, rangefinder, protractor, and 3D angle finder, offering a quick and accurate way to take measurements in various conditions.

**Highlights:** Measure distance by moving device, Ruler, tape measure, rangefinder, Protractor and 3D angle finder, Inertial navigational system technology, Adjustable units (inches/cm), Save measurements with photos, Avoid obstacles during measurement

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Convenient for quick measurements
- 💡 Clever use of phone sensors
- ⭐ Accurate for most use cases
- 🎨 Visually appealing interface

**What reviewers complain about**

- 🐛 Inconsistent measurement accuracy
- 📏 Not as precise as a physical ruler
- ⚠️ Requires multiple measurements for reliable results
- 🤔 Confusing calibration process

**Reported bugs**

- Measurements vary wildly between attempts
- Calibration process fails to complete
- App crashes when used with certain phone cases

**Requested features**

- Add imperial unit support
- Integrate with smart home devices
- Provide more advanced measurement tools
- Improve accuracy for smaller distances


### Ring Sizer Tool

[App page](https://appshunter.io/ios/app/ring-sizer-tool/id6466219535)

Accurately measure your finger size or compare existing rings to find the perfect fit. This tool simplifies ring sizing for confident online purchases and jewelry selection.

**Highlights:** Finger measurement without a ring, Ring comparison for sizing, Intuitive and simple interface, Accurate sizing for online shopping, Suitable for buyers and jewelers

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ring Sizer Annual | $19.99 | per year |

**What reviewers like**

- 👍 Easy to use
- ✅ Accurate sizing
- 💰 Free to use
- 📱 Works with newer iPhones
- 💡 Better than paper methods

**What reviewers complain about**

- ❌ Inaccurate finger sizing
- ❌ Wildly wrong estimates
- ❌ Doesn't work for some users

**Requested features**

- Dynamically update values as slider adjusts


## Frequently asked questions

### Is Flying Ruler free?

Flying Ruler costs $1.99, with no in-app purchases.

### Is Ring Sizer Tool free?

Ring Sizer Tool is free to download, with in-app purchases available.

### Which has better reviews, Flying Ruler or Ring Sizer Tool?

Ring Sizer Tool is rated higher. Flying Ruler averages 4.1 out of 5 from 187 ratings, while Ring Sizer Tool averages 4.7 from 604 ratings.

### Do Flying Ruler or Ring Sizer Tool have ads?

Neither Flying Ruler nor Ring Sizer Tool shows ads.

### Which is updated more often, Flying Ruler or Ring Sizer Tool?

Flying Ruler ships an update every 2 months, and Ring Sizer Tool every 5 weeks. Most recently, Flying Ruler was updated on September 23, 2026 and Ring Sizer Tool on September 21, 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.*