# Ruler vs Cloud Smart Lock App

The clearest difference is review sentiment: Ruler at 100% against Cloud Smart Lock App's 75%. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Ruler ships an update every 3 months, Cloud Smart Lock App every 2 months. The most recent releases landed on October 22, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Ruler | Cloud Smart Lock App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4 ratings)](https://appshunter.io/ios/app/ruler-a-simple-ar-ruler-app/id1287068680/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **100.0% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 22 MB | 33 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Play, Inc.](https://appshunter.io/developer/1078526009) | [明毅 龚](https://appshunter.io/developer/1461728481) |

## What reviewers say

### Ruler

[App page](https://appshunter.io/ios/app/ruler-a-simple-ar-ruler-app/id1287068680)

This utility app uses augmented reality to measure lengths and areas in the real world. Simply point your device's camera to get accurate measurements.

**Highlights:** Augmented reality measurement, Measure length, Measure area, Simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Cloud Smart Lock App

[App page](https://appshunter.io/ios/app/cloud-smart-lock-app/id1461728482)

Manage and operate your smart door lock from the cloud. Features include one-key unlocking, sharing access via QR codes, and automatic unlocking. View lock status and access unlock history.

**Highlights:** Add and manage door locks, One-key unlocking, QR code sharing for access, Automatic unlocking, View lock status, Unlock history records

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Ruler free?

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

### Is Cloud Smart Lock App free?

Cloud Smart Lock App is free to download, with no in-app purchases.

### Do Ruler or Cloud Smart Lock App have ads?

Neither Ruler nor Cloud Smart Lock App shows ads.

### Which is updated more often, Ruler or Cloud Smart Lock App?

Ruler ships an update every 3 months, and Cloud Smart Lock App every 2 months. Most recently, Ruler was updated on October 22, 2026 and Cloud Smart Lock App on October 2, 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.*