Comparison

Safety Note+ Pro vs Memorize Pi Digits

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

Head to head
About

Safety Note+ Pro

Secure your private notes with advanced protection. This app offers passcode and biometric locks, intruder reports, and folder-specific security. Organize, back up, and share your sensitive information with peace of mind.

Highlights
  • Advanced security system
  • Passcode and biometric protection
  • Intruder report
  • Decoy password
  • Folder-specific locking
  • Note organization and backup
Features
Read full description

Some notes deserve a private space of their own. Safety Note+ Pro is the separately purchased Pro edition for personal notes, journals, sensitive lists and confidential ideas. Keep private writing apart from everyday notes, then unlock with Face ID, Touch ID or a passcode. A DEDICATED PRO EDITION Choose Safety Note+ Pro when you prefer a separate paid app for private notes. Optional iCloud Sync and Cloud Backup remain separate services and may require an in-app purchase or subscription. FLEXIBLE PRIVATE ACCESS • Protect the app with a passcode • Use Face ID or Touch ID on supported Apple devices • Choose PIN, password or pattern-style access where available • Return quickly to private writing without mixing it with ordinary notes DECOY AND INTRUDER FEATURES • Set a decoy password that opens alternate content • Review supported intruder reports after failed access attempts • Enable only the privacy features that suit your needs FOLDER-LEVEL PROTECTION • Add separate protection to selected folders • Use folder colors and icons • Organize personal, journal, work and other sensitive notes WRITE AND ORGANIZE • Create short notes, long-form writing and private lists • Search, sort, move and copy notes • Auto-save helps preserve changes as you write • Choose from available themes • Use one universal app on iPhone and iPad OPTIONAL SYNC AND BACKUP • Keep notes on your device for a local workflow • Enable iCloud Sync on supported Apple devices • Choose optional Cloud Backup where available • Confirm that backup has completed before changing devices or deleting the app IMPORTANT DATA SAFETY Deleting the app may remove notes stored only on the device. Before deleting, reinstalling, replacing or erasing a device, confirm where your notes are stored and that any enabled backup has completed successfully. Face ID and Touch ID are handled by Apple. Safety Note+ Pro does not receive or store your biometric face or fingerprint data. Feature availability may vary by device, operating-system version and region. Optional sync, backup and certain services may require separate in-app purchases or subscriptions. Visit us at: Website: https://sixbytes.io Twitter: https://twitter.com/SixbytesApp Facebook: https://www.facebook.com/sixbytesapp For more information, please refer to our Terms of Service and Privacy Policy: Terms of use: https://sixbytes.io/products/safety-note/legal/terms Privacy policy: https://sixbytes.io/products/safety-note/legal/privacy-policy

About

Memorize Pi Digits

This app helps you memorize digits of Pi, offering up to one million digits for practice. It features a dark mode interface and a network competition mode for up to five players. Ideal for educational purposes and memory improvement.

Highlights
  • Memorize up to 1 million Pi digits
  • Dark mode UI design
  • Network competition mode (up to 5 players)
  • Educational game for memory improvement
  • Track progress day by day
Features
Read full description

Pi is constant, it is represented by the Greek letter π. The numerical value of π is 3.1415926....... Pi is infinite series irrational number. From wikipedia: Piphilology is the practice of memorizing large numbers of digits of π, and world-records are kept by the Guinness World Records. The record for memorizing digits of π, certified by Guinness World Records, is 70,000 digits, recited in India by Rajveer Meena in 9 hours and 27 minutes on 21 March 2015. This app is a tool to help you memorize pi digits, we offer first 1 million (1000000) Pi digit. It is the only tools your need to learn Pi. If you want to learn Pi ( π ), it should be the best Pi trainer software. You can learn Pi from 101 to Guinness World Records holder. This game is a very good educational game, learn it day by day. Some days later you will memory a lot of Pi Digit. Many users report that this app can help them to remember pi number, they can't believe that they can remember few hundred digits. But it is real. Every year March 14th is Pi day, to Celebrate Pi Day you can try to remember the first 100 digits. Using our app, you can do it in few hours. The UI design of this game is dark mode, it is the most modern app UI design. You can see the new coming OS also add dark mode theme. Add network competition mode, if all the devices are connected same local area network. You can create a network competition up to 5 people play on same time. FB : https://www.facebook.com/Pi-314-342764079883765/

Screenshots

Safety Note+ Pro4 screens
Memorize Pi Digits4 screens

Verdict

The call

The clearest difference is ads: Safety Note+ Pro at none against Memorize Pi Digits's shown. Safety Note+ Pro also leads on update cadence (fortnightly vs every 5 months) and rating (4.8 vs 4.4). On review sentiment, in-app purchases, device support and iOS requirement 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

Safety Note+ Pro costs $3.99 and Memorize Pi Digits $4.99 up front. Safety Note+ Pro sells 6 in-app purchases, starting at $0.99 per month and Memorize Pi Digits sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Safety Note+ Pro holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 739 and 151 respectively. Written reviews point the same way: 77% of Safety Note+ Pro's written reviews are positive against 74% of Memorize Pi Digits's.

UpkeepUpdate frequency

Safety Note+ Pro ships an update fortnightly, Memorize Pi Digits every 5 months. The most recent releases landed on September 28, 2026 and September 29, 2026 respectively.

Scorecard6 real differences · 4 level
Safety Note+ Pro versus Memorize Pi Digits: the parameters behind the verdict, then further details
ParameterSafety Note+ ProMemorize Pi Digits
Price$3.99 — better$4.99
Rating4.8 (739 ratings) — better4.4 (151 ratings)
Positive reviews77.0% of reviews — better74.4% of reviews
Number of ratings739 — better151
Update frequencyFortnightly — betterEvery 5 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better16.6
Further details — not scored
Size79 MB102 MB
Age rating4+4+
DeveloperEightythree TechnologyOscar Tsang

Customer experience

Safety Note+ Pro

All ratings739 ratings
Positive95.7%
Neutral1.8%
Negative2.6%
Written reviews318 reviews
Positive77.0%
Neutral6.9%
Negative16.0%

Memorize Pi Digits

All ratings151 ratings
Positive84.8%
Neutral5.3%
Negative9.9%
Written reviews43 reviews
Positive74.4%
Neutral4.7%
Negative20.9%

Bugs and requests

Safety Note+ Pro

Reported bugs

4 issues
  • Notes not saving properly
  • Password not recognized after updates
  • App freezing or crashing on startup
  • Incompatibility with newer iOS versions

Requested features

5 requests
  • Cloud sync and backup options
  • Customizable themes and layouts
  • Improved cursor and text selection controls
  • Folder-level password protection
  • Keyword search

Memorize Pi Digits

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Safety Note+ Pro

Subscriptions4
  • iCloud Sync Monthly$0.991 Month
  • Cloud Backup Monthly$1.491 Month
  • iCloud Sync Yearly$6.991 Year
Show 1 more
  • Cloud Backup Yearly$8.991 Year
One-time2
  • Reset Password$1.99
  • iCloud Sync Lifetime$49.99
1 purchases

Memorize Pi Digits

One-time1
  • Remove AD$1.99

Questions

Is Safety Note+ Pro free?
Safety Note+ Pro costs $3.99, and also offers in-app purchases.
Is Memorize Pi Digits free?
Memorize Pi Digits costs $4.99, and also offers in-app purchases.
Which has better reviews, Safety Note+ Pro or Memorize Pi Digits?
Safety Note+ Pro is rated higher. Safety Note+ Pro averages 4.8 out of 5 from 739 ratings, while Memorize Pi Digits averages 4.4 from 151 ratings.
Do Safety Note+ Pro or Memorize Pi Digits have ads?
Memorize Pi Digits shows ads; Safety Note+ Pro does not.
Which is updated more often, Safety Note+ Pro or Memorize Pi Digits?
Safety Note+ Pro ships an update fortnightly, and Memorize Pi Digits every 5 months. Most recently, Safety Note+ Pro was updated on September 28, 2026 and Memorize Pi Digits on September 29, 2026.

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