# O vs Dealful钉富

The clearest difference is update cadence: Dealful钉富 at monthly against O's every 11 months. Dealful钉富 also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for O against 5.0 for Dealful钉富. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

O ships an update every 11 months, Dealful钉富 monthly. The most recent releases landed on October 24, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | O | Dealful钉富 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/o-ring-master/id1072051820/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/dealful/id1660586789/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Monthly** |
| Monetization | Free | Free |
| Size | 47 MB | 53 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GE MAO RUBBER INDUSTRIAL CO., LTD.](https://appshunter.io/developer/1078558543) | [Ningbo China Goodluck Network Technology Co., Ltd.](https://appshunter.io/developer/1080293778) |

## 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


### Dealful钉富

[App page](https://appshunter.io/ios/app/dealful/id1660586789)

This foreign trade management software offers AI-powered customer acquisition, email management, and smart office tools. It streamlines business operations for trade professionals, enabling efficient management from anywhere with real-time data synchronization across devices.

**Highlights:** AI customer acquisition, Email management, Smart office functions, Subordinate management, Real-time data sync, Cross-device access

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is Dealful钉富 free?

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

### Which has better reviews, O or Dealful钉富?

O and Dealful钉富 are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do O or Dealful钉富 have ads?

Neither O nor Dealful钉富 shows ads.

### Which is updated more often, O or Dealful钉富?

O ships an update every 11 months, and Dealful钉富 monthly. Most recently, O was updated on October 24, 2026 and Dealful钉富 on September 17, 2026.

---

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