# Secure Notes (Protect your notes) vs O

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.

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.

## The numbers

| Metric | Secure Notes (Protect your notes) | O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/secure-notes-protect-your-notes/id896147608/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/o-ring-master/id1072051820/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 11 months |
| Monetization | Free | Free |
| Size | 4 MB | 47 MB |
| Requires iOS | **7.1** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ahmet Selman Durak](https://appshunter.io/developer/868110029) | [GE MAO RUBBER INDUSTRIAL CO., LTD.](https://appshunter.io/developer/1078558543) |

## What reviewers say

### Secure Notes (Protect your notes)

[App page](https://appshunter.io/ios/app/secure-notes-protect-your-notes/id896147608)

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.

**Highlights:** Password protection for notes, Secure private note storage, Enhanced privacy, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


### O

[App page](https://appshunter.io/ios/app/o-ring-master/id1072051820)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Secure Notes (Protect your notes) free?

Secure Notes (Protect your notes) is free to download, with no in-app purchases.

### Is O free?

O is free to download, with no in-app purchases.

### Which has better reviews, Secure Notes (Protect your notes) or O?

Secure Notes (Protect your notes) and O are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do Secure Notes (Protect your notes) or O have ads?

Neither Secure Notes (Protect your notes) nor O shows ads.

### Which is updated more often, Secure Notes (Protect your notes) or O?

Secure Notes (Protect your notes) ships an update every 4 months, and O every 11 months. Most recently, Secure Notes (Protect your notes) was updated on October 7, 2026 and O on October 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*