# Lock Notes Pro vs Memorize Pi Digits

The clearest difference is ads: Lock Notes Pro at none against Memorize Pi Digits's shown. Lock Notes Pro also leads on update cadence (every 2 weeks vs every 5 months) and iOS requirement (13.0 vs 16.6). Memorize Pi Digits's advantage is price ($4.99 vs $9.99). On rating, review sentiment, ratings volume and in-app purchases there is nothing between them.

Lock Notes Pro costs $9.99 and Memorize Pi Digits $4.99 up front. Lock Notes Pro sells 1 in-app purchase, starting at $14.99 per year and Memorize Pi Digits sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Lock Notes Pro holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 270 and 152 respectively. Written reviews point the same way: 82% of Lock Notes Pro's written reviews are positive against 74% of Memorize Pi Digits's.

Lock Notes Pro ships an update every 2 weeks, Memorize Pi Digits every 5 months. The most recent releases landed on October 20, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Lock Notes Pro | Memorize Pi Digits |
| --- | --- | --- |
| Price | $9.99 | **$4.99** |
| Rating | **[4.6 (270 ratings)](https://appshunter.io/ios/app/lock-notes-pro/id1052612947/reviews)** | [4.4 (152 ratings)](https://appshunter.io/ios/app/memorize-pi-digits-314/id1264340985/reviews) |
| Number of ratings | **270** | 152 |
| Positive reviews | **82.3% of reviews** | 74.4% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Every 5 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 8 MB | 103 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [JulyApps Ltd](https://appshunter.io/developer/427694580) | [Oscar Tsang](https://appshunter.io/developer/416987065) |

## What reviewers say

### Lock Notes Pro

[App page](https://appshunter.io/ios/app/lock-notes-pro/id1052612947)

Securely store and protect your private notes with password or Touch ID access. This app allows you to keep sensitive information like passwords, secrets, and diaries safe from unauthorized viewing. It offers features like iCloud backup and syncing, image insertion, and printing.

**Highlights:** Password and Touch ID protection, iCloud backup and sync, Insert images and photos, Print notes, Sort and customize notes, Security question recovery

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Auto Backup | $14.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 🔒 Secure storage of notes
- 💡 Useful for organizing personal information
- 🚀 Efficient app performance
- 🔒 Password protection for notes

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔒 Concerns about data loss or backup issues
- 🔒 Difficulty restoring notes from backup
- 💡 Lack of advanced features like checklists or reminders

**Reported bugs**

- Crashes after iOS updates
- Unable to edit or update notes without losing data
- Syncing issues between devices

**Requested features**

- Add checklist functionality
- Implement a recycle bin for deleted notes
- Improve syncing and backup options
- Add more customization options for font, layout, etc.


### Memorize Pi Digits

[App page](https://appshunter.io/ios/app/memorize-pi-digits-314/id1264340985)

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:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove AD | $1.99 | one-time |


## Frequently asked questions

### Is Lock Notes Pro free?

Lock Notes Pro costs $9.99, 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, Lock Notes Pro or Memorize Pi Digits?

Lock Notes Pro is rated higher. Lock Notes Pro averages 4.6 out of 5 from 270 ratings, while Memorize Pi Digits averages 4.4 from 152 ratings.

### Do Lock Notes Pro or Memorize Pi Digits have ads?

Memorize Pi Digits shows ads; Lock Notes Pro does not.

### Which is updated more often, Lock Notes Pro or Memorize Pi Digits?

Lock Notes Pro ships an update every 2 weeks, and Memorize Pi Digits every 5 months. Most recently, Lock Notes Pro was updated on October 20, 2026 and Memorize Pi Digits on October 16, 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.*