# O vs 上班打卡助手

The clearest difference is ads: O at none against 上班打卡助手's shown. O also leads on monetization model (free vs ad-supported). 上班打卡助手's advantage is update cadence (weekly vs every 11 months) and iOS requirement (13.0 vs 16.0). On price, review sentiment, 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.

O ships an update every 11 months, 上班打卡助手 weekly. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | O | 上班打卡助手 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/o-ring-master/id1072051820/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | **Weekly** |
| Monetization | **Free** | Ad-supported |
| Size | 47 MB | 39 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [GE MAO RUBBER INDUSTRIAL CO., LTD.](https://appshunter.io/developer/1078558543) | [lai zhong](https://appshunter.io/developer/1495193771) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-ring-master/id1072051820)

This app provides a comprehensive offline tool for selecting standard rubber seal sizes, including O-Rings, X-Rings, and Back-Up Rings. It offers dimension searches, housing calculations for various sealing applications, and supports multiple international standards in both metric and imperial units.

**Highlights:** Offline standard rubber seal size selection, Search for O-Ring, X-Ring, and Back-Up Ring sizes, O-Ring housing calculations for sealing applications, Supports multiple international standards (AS568, METRIC, JIS, etc.), Metric and Imperial unit support, Substitutable O-Ring size suggestions

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

**In-app purchases:** none


### 上班打卡助手

[App page](https://appshunter.io/ios/app/id1531271096)

This free utility helps busy professionals avoid forgetting to clock in or out. It automatically launches your work app at set times and provides low battery alerts to ensure uninterrupted attendance tracking. All your attendance records are stored locally for easy access.

**Highlights:** Scheduled automatic app launching for clock-ins, Support for multiple work apps (DingTalk, Feishu, WeChat), Screen-off waiting with countdown timer, Low battery alerts to prevent missed clock-ins, Local storage of attendance history

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is 上班打卡助手 free?

上班打卡助手 is free to download, with no in-app purchases.

### Do O or 上班打卡助手 have ads?

上班打卡助手 shows ads; O does not.

### Which is updated more often, O or 上班打卡助手?

O ships an update every 11 months, and 上班打卡助手 weekly. Most recently, O was updated on October 24, 2026 and 上班打卡助手 on October 27, 2026.

---

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