Comparison

My Notes Safe vs SD401

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

My Notes Safe

Securely store your private thoughts and sensitive information with multiple layers of protection. Features include flexible lock options, instant auto-lock, and customizable note organization. Back up your data to the cloud for easy recovery on new devices.

Highlights
  • Flexible lock options (PIN, password, pattern)
  • Decoy password protection
  • Instant auto-lock
  • Quick note capture
  • Swipe gestures for actions
  • Cloud backup and restore
Features
Read full description

My Notes Safe is the ultimate security-focused note-taking app for iPhone and iPad, designed to keep your private thoughts and sensitive information securely locked away from prying eyes with multiple layers of protection. Comprehensive Security - Flexible Lock Options: Secure your notes with a Numeric PIN, Complex Password, or convenient Pattern Lock. - Decoy Password: Protect your real data with a clever decoy password, perfect for situations where you're pressured to reveal access. - Instant Auto-Lock: The app automatically locks and returns to the login screen when you receive a call, notification, or switch apps, ensuring constant privacy. Powerful and Intuitive Features - Quick Capture: Open the app and start typing immediately to create a new secure note. - Swipe Gestures: Swipe right on any note for quick actions like formatting, copying, setting a reminder, or deletion. - Effortless Organization: Long-press and drag to reorder your notes freely and intuitively. - Full Personalization: Customize each note with different fonts, colors, and background colors to match your style. - Time-Based Reminders: Set alerts for important notes and to-dos to ensure you never miss a deadline. - Smart Sidebar: Use the left menu for quick navigation between folders and settings. Backup and Restore - Cloud Backup: Securely back up your data to iCloud, Dropbox, Google Drive, or OneDrive. - Easy Recovery: Restore all your notes and settings to a new device quickly and seamlessly. Get Started Instantly - Built-In Guide: Find all the help you need with the integrated user guide and FAQs. Feedback and Support We highly value your experience. For any questions or suggestions, please contact our support team directly at awfsksk@gmail.com. We are committed to providing you with prompt and helpful assistance.

About

SD401

Features
Read full description

SD401 is a quality control system. The SD401 system consists of an iPhone with SD401 app and external SH7 Reader hardware (purchased separately). The SD401 app provides the GUI for displaying data. Data is received via Bluetooth communications from the SH7 Reader. Displayed data is in numeric form with the addition of alarm “LEDS” for each data point. The number of displayed data points is configured via a setup screen, with password control. Also, the alarm LEDS are configured with limits set for each data point. A data value within limits will be shown with a “green” LED and value outside limits with a “red” LED. Additional SH7 Reader readings such as temperature and battery voltage can be displayed in the app.

Screenshots

My Notes Safe4 screens
SD4012 screens

Verdict

The call

The clearest difference is in-app purchases: SD401 at none against My Notes Safe's 1. SD401 also leads on ads (none vs shown). My Notes Safe's advantage is update cadence (every 2 months vs every 5 months) and iOS requirement (13.0 vs 15.5). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. My Notes Safe sells 1 one-off in-app purchase. SD401 asks for nothing beyond the download.

UpkeepUpdate frequency

My Notes Safe ships an update every 2 months, SD401 every 5 months. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

Scorecard4 real differences · 6 level
My Notes Safe versus SD401: the parameters behind the verdict, then further details
ParameterMy Notes SafeSD401
PriceFreeFree
Rating3.9 (83 ratings) — better—
Positive reviews78.5% of reviews—
Number of ratings83 — better—
Update frequencyEvery 2 months — betterEvery 5 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.0 — better15.5
Further details — not scored
Size41 MB25 MB
Age rating4+4+
Developer炜 桂Owen Brown

In-app purchases

1 purchases

My Notes Safe

One-time1
  • Remove Ads$0.99
None

SD401

No in-app purchases

Questions

Is My Notes Safe free?
My Notes Safe is free to download, with in-app purchases available.
Is SD401 free?
SD401 is free to download, with no in-app purchases.
Do My Notes Safe or SD401 have ads?
My Notes Safe shows ads; SD401 does not.
Which is updated more often, My Notes Safe or SD401?
My Notes Safe ships an update every 2 months, and SD401 every 5 months. Most recently, My Notes Safe was updated on October 11, 2026 and SD401 on October 9, 2026.

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