# LOCK MEMO vs SIS Password Manager

The clearest difference is ratings volume: LOCK MEMO at 494 against SIS Password Manager's 1. SIS Password Manager's advantage is rating (5.0 vs 4.7) and update cadence (every 9 days vs monthly). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. LOCK MEMO sells 1 in-app purchase, starting at $0.99 per month and SIS Password Manager sells 4 in-app purchases, starting at $1.49 per month. Whichever you choose, the download price is not the number that matters.

SIS Password Manager holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: LOCK MEMO has 494 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 74% of LOCK MEMO's written reviews are positive against 76% of SIS Password Manager's.

LOCK MEMO ships an update monthly, SIS Password Manager every 9 days. The most recent releases landed on September 22, 2026 and August 21, 2026 respectively.

## The numbers

| Metric | LOCK MEMO | SIS Password Manager |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (494 ratings)](https://appshunter.io/ios/app/lock-memo-secure-notes/id1070901429/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sis-password-manager/id1604337794/reviews)** |
| Number of ratings | **494** | 1 |
| Positive reviews | 74.5% of reviews | **76.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 9 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 31 MB | 140 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [EasterEggs](https://appshunter.io/developer/553389214) | [SISYOU.KUM](https://appshunter.io/developer/1604337796) |

## What reviewers say

### LOCK MEMO

[App page](https://appshunter.io/ios/app/lock-memo-secure-notes/id1070901429)

This app offers a straightforward way to create and manage private notes with robust passcode protection. It's designed for intuitive use, requiring no complex setup to keep your personal information, ideas, and daily entries secure and organized.

**Highlights:** Passcode protection, Create and edit notes, Folder management, Search notes, iCloud backup, Adjustable font size

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $0.99 | per month |

**What reviewers like**

- 👍 Very easy to use and intuitive
- 🔒 Password protection and security features
- 💾 Reliable for storing notes and important information
- ⚡ Simple and lightweight application
- 📝 Great for quick memos and memory jogger

**What reviewers complain about**

- 🐛 Notes disappearing unexpectedly
- 🐛 Edit function stops working after extended use
- 📱 Compatibility issues with newer iOS versions
- ❌ No alphabetical sorting capability
- ❌ No search functionality

**Reported bugs**

- Notes disappearing from folders
- Edit function becomes unavailable
- App incompatible with newer iOS versions
- Touch ID not functioning despite advertised
- Password recovery issues

**Requested features**

- Alphabetical sorting of notes
- Search functionality
- Touch ID/biometric authentication
- Text formatting options (bold, underline, italics)
- Ability to share or export notes


### SIS Password Manager

[App page](https://appshunter.io/ios/app/sis-password-manager/id1604337794)

Securely manage all your passwords and sensitive data with military-grade encryption. Easily log in using biometrics and back up your information to the cloud for effortless restoration across devices. Offers extensive customization with over 12,000 icons.

**Highlights:** Military-grade AES 256-bit encryption, Biometric login (Touch ID/Face ID), Cloud backup and restore, Automatic password generator, Up to 3 IDs/passwords/images per record, Over 12,000 icon options, Dark mode support

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Automatic backup | $1.49 | per month |
| Auto-backup and cheer | $9.49 | per month |
| No advertisement mode | $2.99 | one-time |
| No ads. mode with cheer | $7.99 | one-time |


## Frequently asked questions

### Is LOCK MEMO free?

LOCK MEMO is free to download, with in-app purchases available.

### Is SIS Password Manager free?

SIS Password Manager is free to download, with in-app purchases available.

### Which has better reviews, LOCK MEMO or SIS Password Manager?

SIS Password Manager is rated higher. LOCK MEMO averages 4.7 out of 5 from 494 ratings, while SIS Password Manager averages 5.0 from 1 ratings.

### Do LOCK MEMO or SIS Password Manager have ads?

Both LOCK MEMO and SIS Password Manager show ads.

### Which is updated more often, LOCK MEMO or SIS Password Manager?

LOCK MEMO ships an update monthly, and SIS Password Manager every 9 days. Most recently, LOCK MEMO was updated on September 22, 2026 and SIS Password Manager on August 21, 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.*