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
Read full descriptionHide full description
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
Read full descriptionHide full description
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
The clearest difference is review sentiment: O at 100% against Secure Notes (Protect your notes)'s 40%. O also leads on rating (5.0 vs 4.0). Secure Notes (Protect your notes)'s advantage is update cadence (every 4 months vs every 11 months) and ratings volume (4 vs 1). 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 holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews point the same way: 40% 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 November 8, 2026 and November 2, 2026 respectively.
| Parameter | Secure Notes (Protect your notes) | O |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 40.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 4 — 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
