# LOCK MEMO vs Volt Drop Check & Plug

The clearest difference is price: LOCK MEMO at Free against Volt Drop Check & Plug's $0.49. LOCK MEMO also leads on update cadence (monthly vs every 7 months). Volt Drop Check & Plug's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

LOCK MEMO is free to download; Volt Drop Check & Plug costs $0.49 up front. LOCK MEMO sells 1 in-app purchase, starting at $0.99 per month. Volt Drop Check & Plug asks for nothing beyond the download.

LOCK MEMO ships an update monthly, Volt Drop Check & Plug every 7 months. The most recent releases landed on October 17, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | LOCK MEMO | Volt Drop Check & Plug |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| Rating | **[4.7 (495 ratings)](https://appshunter.io/ios/app/lock-memo-secure-notes/id1070901429/reviews)** | — |
| Number of ratings | **495** | — |
| Positive reviews | 74.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 7 months |
| Monetization | Free with in-app purchases | — |
| Size | 33 MB | 35 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [EasterEggs](https://appshunter.io/developer/553389214) | [MASAHIRO HIRAIWA](https://appshunter.io/developer/1814993082) |

## 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


### Volt Drop Check & Plug

[App page](https://appshunter.io/ios/app/volt-drop-check-and-plug/id6752117109)

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

**In-app purchases:** none


## Frequently asked questions

### Is LOCK MEMO free?

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

### Is Volt Drop Check & Plug free?

Volt Drop Check & Plug costs $0.49, with no in-app purchases.

### Do LOCK MEMO or Volt Drop Check & Plug have ads?

LOCK MEMO shows ads; Volt Drop Check & Plug does not.

### Which is updated more often, LOCK MEMO or Volt Drop Check & Plug?

LOCK MEMO ships an update monthly, and Volt Drop Check & Plug every 7 months. Most recently, LOCK MEMO was updated on October 17, 2026 and Volt Drop Check & Plug on October 2, 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.*