Private Notes and Secret Diary vs Lock Notes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Private Notes and Secret Diary
Securely store and manage your private notes with password protection. Keep personal details safe from prying eyes on your device, even when sharing with others.
- Password protection for notes
- Secure storage of personal details
- Create simple notes
- Share device while keeping notes secure
- Prevent unauthorized access
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Free for limited time This is a best solution for your privacy ** THE BEST NOTE LOCK APP EVER **. Provides functionality for creating simple notes and keeping these notes secure by requiring a password to be entered before any note can be viewed or edited. Allows you to share your iPhone with others and still keep your notes secure. Great for storing all of your personal details, pin numbers etc on your device without the risk that someone might get access.
Lock Notes
Securely store private thoughts, passwords, and reminders with biometric authentication. Enjoy a simple, elegant interface with iCloud sync, customizable themes, and backup options. Your data remains private and encrypted.
- Biometric authentication (Face ID, Touch ID)
- Encrypted note storage
- iCloud sync across devices
- Customizable themes and dark mode
- Backup and restore functionality
- Ad-free minimalist interface
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Keep a personal notebook for your thoughts, diary entries, ideas and everyday lists. Lock Notes gives your writing its own space, with a passcode and supported biometric unlock to control access. WRITE THE WAY YOU THINK Give long notes structure with headings, bold and italic text, lists and checklists. Add photos directly into your writing, keep a simple journal, or capture an idea before it slips away. FIND WHAT MATTERS Search your notes and find text inside an open note. Automatic saving keeps your edits as you write and when you leave the editor. A clean layout keeps the focus on your text. TAKE YOUR WRITING WITH YOU Export notes as TXT or formatted PDF, share the notes you choose, and print a copy. Use exports for a personal archive, a draft to continue elsewhere, or a list to share. RECOVER AN ACCIDENTAL DELETION Recently Deleted keeps removed notes for up to 30 days, so you can restore one before it is permanently deleted. CHOOSE HOW YOU WORK Write with local storage, adjust the appearance, and use a light or dark interface. Optional cloud synchronization is available with Premium and a compatible cloud account. From a short memo to a longer personal journal, keep your writing easy to find and comfortable to read. - Privacy Policy: https://lykovstudio.io/privacy - Terms of Use: https://lykovstudio.io/terms
Screenshots
Verdict
The clearest difference is monetization model: Private Notes and Secret Diary at free with in-app purchases against Lock Notes's subscription. Private Notes and Secret Diary also leads on iOS requirement (8.0 vs 15.0). Lock Notes's advantage is rating (4.4 vs 3.9) and update cadence (every 10 days vs every 10 months). 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. Private Notes and Secret Diary sells 1 one-off in-app purchase and Lock Notes sells 7 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Lock Notes holds the better App Store score, 4.4 against 3.9. That said, the two scores are not equally well evidenced: Lock Notes has 138 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 38% of Private Notes and Secret Diary's written reviews are positive against 54% of Lock Notes's.
Private Notes and Secret Diary ships an update every 10 months, Lock Notes every 10 days. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.
| Parameter | Private Notes and Secret Diary | Lock Notes |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (8 ratings) | 4.4 (138 ratings) — better |
| Positive reviews | 38.5% of reviews | 54.2% of reviews — better |
| Number of ratings | 8 | 138 — better |
| Update frequency | Every 10 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 6 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Tigran Mkhitaryan | LYKOV STUDIO LTD |
Customer experience
Private Notes and Secret Diary
Lock Notes
In-app purchases
Private Notes and Secret Diary
- Remove Ads$1.99
Lock Notes
- Weekly$4.997 Days
- Weekly3 Days trial$4.997 Days
- Monthly$7.991 Month
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- Annual$29.991 Year
- Annual3 Days trial$29.991 Year
- Disable ads$0.99
- Lifetime$39.99
Questions
Is Private Notes and Secret Diary free?
Is Lock Notes free?
Which has better reviews, Private Notes and Secret Diary or Lock Notes?
Do Private Notes and Secret Diary or Lock Notes have ads?
Which is updated more often, Private Notes and Secret Diary or Lock Notes?
Other comparisons
