Secure Notes (Protect your notes) vs O
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Secure Notes (Protect your notes)
Keep your private thoughts and sensitive information safe with this utility. Secure your notes using a password to prevent unauthorized access and ensure your privacy.
- Password protection for notes
- Secure private note storage
- Enhanced privacy
- User-friendly interface
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Do you want to write private notes? And don't you know the way of how to secure them? Secure Notes is the app which helps you to protect your notes with a password. You don't afraid anymore if someone will read your notes.
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.
Screenshots
Verdict
Secure Notes (Protect your notes) and O both sit at 5.0 stars, but that hides the real split: 100% of O's written reviews are positive against 50% of Secure Notes (Protect your notes)'s. Secure Notes (Protect your notes)'s advantage is update cadence (every 4 months vs every 11 months) and ratings volume (3 vs 1). On price, rating, 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.
On the App Store both sit at effectively the same score — 5.0 for Secure Notes (Protect your notes) against 5.0 for O. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews are what separate them: 50% of Secure Notes (Protect your notes)'s written reviews are positive against 100% of O's.
Secure Notes (Protect your notes) ships an update every 4 months, O every 11 months. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.
| Parameter | Secure Notes (Protect your notes) | O |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) | 5.0 (1 ratings) |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 4 months — better | Every 11 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 7.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 4 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Ahmet Selman Durak | GE MAO RUBBER INDUSTRIAL CO., LTD. |
Customer experience
Secure Notes (Protect your notes)
O
In-app purchases
Secure Notes (Protect your notes)
No in-app purchases
O
No in-app purchases
Questions
Is Secure Notes (Protect your notes) free?
Is O free?
Which has better reviews, Secure Notes (Protect your notes) or O?
Do Secure Notes (Protect your notes) or O have ads?
Which is updated more often, Secure Notes (Protect your notes) or O?
Other comparisons
