Comparison

Secure Notes vs ThreeDay Calendar

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

Head to head
About

Secure Notes

Securely store and organize your notes, ideas, and important information with advanced encryption. Protect your data with biometric authentication and access it from anywhere via cloud sync. Customize your experience with a dark mode and other preferences for peace of mind.

Highlights
  • Advanced encryption for maximum security
  • Intuitive note creation and editing
  • Password, Face ID, and Touch ID access
  • Cloud synchronization across devices
  • Dark mode and interface customization
Read full description

Your thoughts deserve total privacy. Some ideas are too personal to risk. Passwords, secret plans, private memories — this app keeps them locked away on your device, always. No cloud. No servers. No one but you. BUILT FOR PRIVACY Your notes never leave your device. No syncing, no uploading, no exposure. What you write stays with you — period. LOCK IT DOWN Protect everything with a password. Enable Face ID or Touch ID for instant, secure access in seconds. MAKE IT YOURS Choose from 16 beautiful backgrounds to match your mood. A notes app that feels personal. SIMPLE AND POWERFUL Create, edit, search, and sort your notes effortlessly. Find anything instantly with smart search. Available on iPhone, iPad, and Mac. ZERO ADS No distractions. No tracking. Just you and your thoughts. Whether you are storing passwords, journaling private thoughts, saving business ideas, or keeping sensitive info away from prying eyes — this is the vault you always needed. You may purchase an auto-renewing subscription through an In-App Purchase. • Auto-renewable subscription. • Subscription durations: Monthly or Annual (both include a free trial period). • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. Privacy Policy: https://sites.google.com/site/privacycoldat/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

ThreeDay Calendar

Features
Read full description

ThreeDay Calendar is built around the next three days: today, tomorrow, and the day after tomorrow. Instead of opening a full month grid every time, you can scan what matters now in a simple 3-day timeline. Key features - See today, tomorrow, and the day after tomorrow at a glance - Show events from calendars connected to your device, including iCloud, Google, Exchange, local, and shared calendars - Create local events or save directly to writable device calendars - Add title, start time, end time, repeat, location, reminder, and description - Search titles and notes across local and device calendar events - Hide calendars you do not need and rename calendar labels inside the app - Use event templates for repeated forms of events - Choose light, cream, or dark theme - Premium: home screen widgets for today, tomorrow, the day after tomorrow, and event cards - Premium: replace the ad area with a memo, photo frame, or D-Day display Privacy and data Your schedule data stays on your device. The app does not store your events on a separate server. Calendar access is used to show and write events through iOS device calendars when you allow it. Note Calendar sharing permissions are managed in Apple iCloud Calendar, Google Calendar, Exchange, or the calendar service you use; this app displays shared calendars that are already connected to your device. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Secure Notes4 screens
ThreeDay Calendar4 screens

Verdict

The call

The clearest difference is ads: Secure Notes at none against ThreeDay Calendar's shown. Secure Notes also leads on device support (4 vs 2) and iOS requirement (15.0 vs 18.0). ThreeDay Calendar's advantage is update cadence (fortnightly vs every 8 months). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Secure Notes sells 2 in-app purchases, starting at $0.99 per month and ThreeDay Calendar sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Secure Notes ships an update every 8 months, ThreeDay Calendar fortnightly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
Secure Notes versus ThreeDay Calendar: the parameters behind the verdict, then further details
ParameterSecure NotesThreeDay Calendar
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews20.6% of reviews—
Number of ratings1 — better—
Update frequencyEvery 8 monthsFortnightly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size14 MB6 MB
Age rating4+4+
DeveloperEmanuele FlorisHoein Song

In-app purchases

2 purchases

Secure Notes

Subscriptions2
  • Unlimited Access3 Days trial$0.991 Month
  • Unlimited Access3 Days trial$2.991 Year
2 purchases

ThreeDay Calendar

Subscriptions2
  • ThreeDay Premium Monthly$0.991 Month
  • ThreeDay Premium Yearly$9.991 Year

Questions

Is Secure Notes free?
Secure Notes is free to download, with in-app purchases available.
Is ThreeDay Calendar free?
ThreeDay Calendar is free to download, with in-app purchases available.
Do Secure Notes or ThreeDay Calendar have ads?
ThreeDay Calendar shows ads; Secure Notes does not.
Which is updated more often, Secure Notes or ThreeDay Calendar?
Secure Notes ships an update every 8 months, and ThreeDay Calendar fortnightly. Most recently, Secure Notes was updated on October 26, 2026 and ThreeDay Calendar on October 25, 2026.

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