O vs EWINBOX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O
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.
- 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
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GMORS O-Ring Master is the completed tool for standard rubber seal sizes. When you use this APP, you don't need to have internet and catalog. Except O-Ring sizes, it also includes the search functions of X-Ring and Back-Up Ring. Otherwise, you can also use O-Ring Housing to choose suitable O-Ring in your application. Main functions are as follows: Dimension Search:O-Ring, X-Ring and Back-Up Ring. - MM and Inch are both available. - Full standard O-Ring series: AS568, BS 4518, GB/T 3452.1, JIS B2401 P, JIS B2401 G, JIS B2401 S, JIS B2401 V, SMS 1586 and METRIC. - Collocated Back-Up for AS-568 O-Ring. - Substitutable O-Ring sizes within tolerance are available. O-Ring Housing: Piston Sealing、Rod Sealing and Face Sealing. - MM and Inch are both available. - Support calculation for both Static and Dynamic sealing applications (Face sealing is with static calculation only). - Up to 7 O-Ring standards ( AS568, METRIC, JIS B2401 P/G/S/V, JASO F404, GB/T 3452.1, BS 4518 and SMS 1586) for most of size requirement of different groove design.
EWINBOX
This utility allows you to personalize your phone case by displaying custom photos or text on its ink screen. Utilize your phone's NFC to transfer designs for a long-lasting, unique look. The app offers a variety of materials and theme options for DIY creation.
- Customizable ink screen display
- NFC photo and text transfer
- Personalized DIY themes
- Large library of design materials
- Regular theme content updates
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[Product Introduction] This software is a software that can change the display content of the mobile phone case at any time to achieve personalized DIY. Through the mobile phone NFC, you can directly transfer your favorite photos or text to the ink screen of the mobile phone case for long-lasting display. [Functional Features] We will keep up with the trend and constantly update the theme content of each category. You can modify the theme according to your preferences or DIY the theme by yourself. The software provides a large number of available materials to help you create a unique personalized display screen.
Screenshots
Verdict
The clearest difference is review sentiment: O at 100% against EWINBOX's 0%. EWINBOX's advantage is update cadence (every 2 months vs every 11 months) and iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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, EWINBOX every 2 months. The most recent releases landed on September 26, 2026 and October 10, 2026 respectively.
| Parameter | O | EWINBOX |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 11 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 47 MB | 223 MB |
| Age rating | 4+ | 4+ |
| Developer | GE MAO RUBBER INDUSTRIAL CO., LTD. | BOE Yiyun Technology Co., Ltd. |
Customer experience
O
EWINBOX
In-app purchases
O
No in-app purchases
EWINBOX
No in-app purchases








