# Slant Gauge vs Qprio

The clearest difference is in-app purchases: Qprio at none against Slant Gauge's 1. Qprio also leads on ads (none vs shown). Slant Gauge's advantage is iOS requirement (15.6 vs 17.6). On price, update cadence and device support there is nothing between them.

Both are free to download. Slant Gauge sells 1 one-off in-app purchase. Qprio asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Slant Gauge | Qprio |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 62.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 22 MB | 1 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Isamu Sakamoto](https://appshunter.io/developer/598583811) | [misty-egg,Y.K.](https://appshunter.io/developer/1890694226) |

## What reviewers say

### Slant Gauge

[App page](https://appshunter.io/ios/app/slant-gauge/id598583808)

Measure angles and slopes with a simple digital display that rotates for easy viewing. This tool speaks the angle aloud, aiding in adjustment work. Calibration can improve its accuracy.

**Highlights:** Simple angle and slope measurement, Spoken angle output, Digital display rotates for visibility, Calibration for improved accuracy, Useful for adjustment work

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 角度傾斜計 | $1.99 | one-time |


### Qprio

[App page](https://appshunter.io/ios/app/qprio-qr-code-reader/id6761655145)

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

**In-app purchases:** none


## Frequently asked questions

### Is Slant Gauge free?

Slant Gauge is free to download, with in-app purchases available.

### Is Qprio free?

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

### Do Slant Gauge or Qprio have ads?

Slant Gauge shows ads; Qprio does not.

### Which is updated more often, Slant Gauge or Qprio?

Slant Gauge ships an update every 3 months, and Qprio every 3 months. Most recently, Slant Gauge was updated on November 1, 2026 and Qprio on October 28, 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.*