O vs Smart Lock
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.
Smart Lock
This utility app works with a specific mechatronic lock and key system to manage access and track operations. It allows users to find smart keys, open authorized locks, apply for access tickets, and view operation logs. The app also facilitates lock management and provides navigation to stations.
- Search and connect to Smart Keys
- Open authorized Smart Locks
- Apply for and manage lock access tickets
- View daily, weekly, and monthly operation logs
- Manage lock authorizations and One Time Passwords
- Initialize, reset, and bind locks
- Navigate to station locations
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Smart Lock App is the App working with Smart Lock solution which help user to reduce OPEX and increase efficiency and security level during user’s daily operating work. This App is only working with corresponding mechatronic lock and key. Function: Search for Smart Key Click the icon of key on the homepage to find the Smart Key, and then click the Smart Key ID to connect. Open Smart Lock Click the icon of lock on the homepage to open a Smart Lock while the login account has proper authorization. My Ticket New: Apply new ticket to get authorization to open lock. Pending: Pending ticket that wait for approval. Rejected: Rejected ticket. Approved: Ticket that approved. My Operation Today: The event log for today. Week: The event log for one week. Month: The event log for one month. More: The event log for one month ago. Management Authorization: Assigned lock authorization and One Time Password. Lock: Initialize lock, Reset lock, Bind lock and get lock ID. Approve: To approve pending ticket for user who has privilege. Offline & Log: Download the assigned lock authorization to Smart Key and Check or Collect event logs from Smart Key. Navigation Check the location of stations and user also can get navigation information by click the station. Note: 1. iPhone 4s or above is required since this App is required to use Bluetooth 4.0. 2. GPS running in the background can be big battery usage.
Screenshots
Verdict
The clearest difference is rating: O at 5.0 against Smart Lock's 1.0. Smart Lock's advantage is update cadence (every 2 months vs every 11 months) and iOS requirement (13.0 vs 16.0). On price, ratings volume, ads and in-app purchases 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 holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
O ships an update every 11 months, Smart Lock every 2 months. The most recent releases landed on September 22, 2026 and June 11, 2026 respectively.
| Parameter | O | Smart Lock |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 1 | 1 |
| 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 | 13.0 — better |
| Further details — not scored | ||
| Size | 47 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | GE MAO RUBBER INDUSTRIAL CO., LTD. | Hizima Technologies Co., Ltd |
Customer experience
O
Smart Lock
In-app purchases
O
No in-app purchases
Smart Lock
No in-app purchases








