# 51机械 vs KeepUs Go (Smart Locker)

The clearest difference is update cadence: KeepUs Go (Smart Locker) at weekly against 51机械's monthly. 51机械's advantage is iOS requirement (12.4 vs 15.0). 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.

51机械 ships an update monthly, KeepUs Go (Smart Locker) weekly. The most recent releases landed on August 30, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | 51机械 | KeepUs Go (Smart Locker) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/51/id6498631490/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 50 MB | 49 MB |
| Requires iOS | **12.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HuiGong Technology (HangZhou) Co., Ltd.](https://appshunter.io/developer/1741716341) | [Mediazen, Inc.](https://appshunter.io/developer/1846540124) |

## What reviewers say

### 51机械

[App page](https://appshunter.io/ios/app/51/id6498631490)

This platform connects owners of construction machinery with job opportunities for rental and sale. It also facilitates recruitment for machine operators and provides tools for maintenance, repair, and project management. Users can access a marketplace for new and used equipment, streamlining operations and transactions within the industry.

**Highlights:** Find jobs and rentals for excavators, loaders, and cranes, Recruit certified and experienced machine operators, Access repair and maintenance services for machinery, Utilize project management and accounting tools, Buy and sell used construction equipment, Digital construction site management

**In-app purchases:** none


### KeepUs Go (Smart Locker)

[App page](https://appshunter.io/ios/app/keepus-go-smart-locker/id6760886911)

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

**In-app purchases:** none


## Frequently asked questions

### Is 51机械 free?

51机械 is free to download, with no in-app purchases.

### Is KeepUs Go (Smart Locker) free?

KeepUs Go (Smart Locker) is free to download, with no in-app purchases.

### Do 51机械 or KeepUs Go (Smart Locker) have ads?

Neither 51机械 nor KeepUs Go (Smart Locker) shows ads.

### Which is updated more often, 51机械 or KeepUs Go (Smart Locker)?

51机械 ships an update monthly, and KeepUs Go (Smart Locker) weekly. Most recently, 51机械 was updated on August 30, 2026 and KeepUs Go (Smart Locker) on August 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*