O vs Weight Log
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.
Weight Log
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Weight Log: Accurately Track Every Change with Data and Photos Can't remember weight fluctuations or see body changes? Weight Log, a body management tool focused on precise tracking, helps you clearly archive every change, making persistence no longer blind. ## Why Choose "Weight Log"? 1. Weight + Photos, Dual Tracking for Greater Clarity Photo Archiving: Take a photo each time you weigh in, paired with weight data, to visually compare body changes—progress you can actually see. 2. Calendar + List + Charts, Intuitive Data Presentation Data Integration: Automatically generate charts showing daily, weekly, and monthly changes at a glance, easily grasping fluctuation patterns. 3. Multi-dimensional Data, Comprehensive Body Status Tracking Core Tracking: Precisely record weight, waist circumference, thigh circumference, and other body measurements, giving you full insight into physical changes. 4. Healthy Habit Tracking, Smarter Management Sync Tracking: Log daily habits like diet, exercise, sleep, and water intake to explore their relationship with weight changes, providing scientific basis for health management. 5. Minimalist Operation, Focus on Recording Itself Easy to Use: Start recording immediately upon opening—no complicated setup required—so you can focus purely on tracking. 6. Beautiful Themes, Changing Moods While Recording Multiple Themes: Fresh Green, Energetic Blue, Soft Pink… Switch freely to make tracking feel more ritualistic. 7. Check-in Days + Exclusive Badges, Motivating Your Persistence Achievement System: Every effort is recognized, turning tracking into a lasting habit. >> For Users Like You Currently pursuing fat loss / shaping and wanting clear tracking of weight and body changes Prefer simple weight management without complex features Seek aesthetically pleasing interfaces and enjoy a clean user experience Want to scientifically manage health through habit tracking >> Start Recording Your Changes Now From today onward, let every weighing have meaning. Download "Weight Log", use photos and data, and meet a better version of yourself. Privacy Policy: http://tzjl.beijingmorning.cn/index/yinsi User Agreement: http://tzjl.beijingmorning.cn/index/zhengce
Screenshots
Verdict
The clearest difference is in-app purchases: O at none against Weight Log's 7. Weight Log's advantage is update cadence (weekly vs every 11 months) and iOS requirement (14.0 vs 16.0). On price, ads and device support 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. Weight Log sells 7 in-app purchases, starting at $2.99 per month. O asks for nothing beyond the download.
O ships an update every 11 months, Weight Log weekly. The most recent releases landed on September 26, 2026 and September 22, 2026 respectively.
| Parameter | O | Weight Log |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 11 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 47 MB | 126 MB |
| Age rating | 4+ | 17+ |
| Developer | GE MAO RUBBER INDUSTRIAL CO., LTD. | 迪 王 |
In-app purchases
O
No in-app purchases
Weight Log
- 包月会员$2.991 Month
- 年度会员$3.991 Year
- Monthly Membership$3.991 Month
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- 季度会员$4.993 Months
- Quarterly Membership$7.993 Months
- 年度会员$9.991 Year
- Annual Membership$11.991 Year









