LOCK MEMO vs Just a Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LOCK MEMO
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.
- Passcode protection
- Create and edit notes
- Folder management
- Search notes
- iCloud backup
- Adjustable font size
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LOCK MEMO is a simple and secure note app with password protection. Designed with simplicity in mind, anyone can use it intuitively without complicated steps. No complex setup is required. Start using it today. ※ Password protection must be enabled in settings. ** Features ** • Create and edit notes • Passcode protection • Adjust font size • Character and line counter • Search notes • Folder management • iCloud backup • URL scheme (pwmm:) Perfect for storing private information, ideas, daily notes, and personal content securely. Keep your notes safe and organized with LOCK MEMO. ■ Terms of Use https://eeggs.jp/terms-of-use-en
Just a Calculator
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Just a Calculator is built to add, subtract, multiply, divide—and get the answer right. CALCULATOR ESSENTIALS • Addition, subtraction, multiplication, and division • Percentages, square roots, tax in/out, memory, and grand total • Up to 12 integer digits, decimal display, and scientific notation • Decimal arithmetic that avoids familiar binary floating-point surprises in money calculations • F / 4 / 3 / 2 / 1 / 0 / ADD2 decimal settings • CUT / 5/4 / UP rounding modes • Save and switch between up to three tax rates CLEAR INPUT AND RESULTS Thousands separators appear naturally while you type. Results use a monospaced display with a slashed zero. Copy a result or share it as a clean image. CALCULATION HISTORY Save the expression, result, and time on your device. Free use keeps the latest 10 calculations. Ad-Free keeps up to 100 and lets you delete individual entries. The calculator and on-device history work offline. OLYMPIC GOLF SCORING Use the standard mode for up to 4 players or the large mode for up to 100. Enter negative scores, calculate totals, averages, and settlements, keep a results history, and share a results image. Friend Link lets an organizer create an event and invite players with a QR code or invitation code. Participants can share attendance and scores with the organizer. This feature requires an internet connection. SOUND AND HAPTICS Configure key sounds and vibration separately. Key sounds respect your device’s Silent Mode. ADS AND IN-APP PURCHASES The free version displays ads. • Ad-Free: a one-time ¥200 purchase in Japan. It permanently removes ads and unlocks additional key sounds. • Event Plus: ¥200 per month in Japan, automatically renewing. It lets you manage multiple weekend events in the same month. Once purchased, ad-free access remains even after the plan ends. The local price shown by the App Store applies in each country or region. Event Plus renews automatically unless canceled. You can manage or cancel it in your Apple Account subscription settings. Privacy Policy: https://dentaku.otsi.jp/en/privacy/ Terms of Use: https://dentaku.otsi.jp/en/terms/
Screenshots
Verdict
The clearest difference is update cadence: Just a Calculator at every 4 days against LOCK MEMO's monthly. On price, ads, in-app purchases and device support 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
Both are free to download. LOCK MEMO sells 1 in-app purchase, starting at $0.99 per month and Just a Calculator sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
LOCK MEMO ships an update monthly, Just a Calculator every 4 days. The most recent releases landed on October 29, 2026 and October 26, 2026 respectively.
| Parameter | LOCK MEMO | Just a Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (496 ratings) — better | — |
| Positive reviews | 74.5% of reviews | — |
| Number of ratings | 496 — better | — |
| Update frequency | Monthly | Every 4 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 33 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | EasterEggs | Yuichi Ono |
Bugs and requests
LOCK MEMO
Reported bugs
6 issues- Notes disappearing from folders
- Edit function becomes unavailable
- App incompatible with newer iOS versions
- Touch ID not functioning despite advertised
- Password recovery issues
Show 1 moreShow fewer
- App crashes or freezes
Requested features
9 requests- Alphabetical sorting of notes
- Search functionality
- Touch ID/biometric authentication
- Text formatting options (bold, underline, italics)
- Ability to share or export notes
Show 4 moreShow fewer
- Picture upload capability
- Increased storage space
- Option to purchase ad-free version
- Dark mode option
Just a Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
LOCK MEMO
- Premium Plan$0.991 Month
Just a Calculator
- Event Plus$0.991 Month
- Ad-Free$0.99
Questions
Is LOCK MEMO free?
Is Just a Calculator free?
Do LOCK MEMO or Just a Calculator have ads?
Which is updated more often, LOCK MEMO or Just a Calculator?
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