# Blue Lamp vs Ruler∘

The clearest difference is iOS requirement: Blue Lamp at 6.0 against Ruler∘'s 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Blue Lamp | Ruler∘ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (44 ratings)](https://appshunter.io/ios/app/ruler/id1503532937/reviews)** |
| Number of ratings | — | **44** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 6 MB | 6 MB |
| Requires iOS | **6.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [FEIBIT ELECTRONIC TECHNOLOGY CO., LTD.](https://appshunter.io/developer/961499817) | [Andrei Shpileuski](https://appshunter.io/developer/1471178734) |

## What reviewers say

### Blue Lamp

[App page](https://appshunter.io/ios/app/blue-lamp/id994015872)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ruler∘

[App page](https://appshunter.io/ios/app/ruler/id1503532937)

This app uses augmented reality to measure distances, lengths, heights, and angles with your device's camera. It offers various modes for accurate measurements on different surfaces and for small objects. Users can save their measurements directly to their camera roll.

**Highlights:** Augmented reality measurements, Measure distance, length, height, area, angles, Point and shoot measurement, Air Mode for linear measurement, Surface Locked for planes, Save measures to Camera Roll

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

**In-app purchases:** none


## Frequently asked questions

### Is Blue Lamp free?

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

### Is Ruler∘ free?

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

### Do Blue Lamp or Ruler∘ have ads?

Neither Blue Lamp nor Ruler∘ shows ads.

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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.*