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 and protect your private notes with a passcode or Touch ID. Keep sensitive information like passwords, secrets, and diary entries safe from unauthorized access. Backup and sync notes across devices, customize their appearance, and even add images.
- Passcode and Touch ID protection
- Security question recovery
- iCloud backup and sync
- Customizable font style and size
- Insert images into notes
- Print and share notes
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FINALLY AN APP FOR ALL YOUR PRIVATE NOTES! Keep your most valuable, private, and secret notes away from prying eyes. Keep them all totally secret and safe. Store passwords, secrets, contacts or just keep your diary private. KEY FEATURES: • Use Touch ID or passcode to safely lock access to your private notes. • Set a security question and answer in case you forget your passcode. • Safely Backup your valuable notes to iCloud. • Quickly Sync notes between iPhone & iPad with iCloud. • Sort notes list by name, date or manual. • Select notes font style and size. • Insert images & photos into notes. • Print your notes. • Send notes via text message or email. • Save notes to Camera Roll. • Support for Emoji Emoticons. This app allows you to automatically backup your notes for $9.99 a year through an auto-renewing subscription. Subscriptions will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless cancelled at least 24 hours before the end of the current period You will not be able to cancel a subscription during the active period. You can manage your subscriptions in the Account Settings after purchase. Terms of use: http://www.katans.com/terms-of-use Privacy policy: http://www.katans.com/privacy-policy This app can be freely used up to two notes. A SINGLE PURCHASE COVERS ALL YOUR IPHONE AND IPAD DEVICES.
Screenshots
Verdict
The clearest difference is rating: Lock Notes at 4.5 against Private Notes and Secret Diary's 3.9. Lock Notes also leads on review sentiment (73% vs 38%) and update cadence (every 10 days vs every 10 months). Private Notes and Secret Diary's advantage is monetization model (free with in-app purchases vs subscription) and iOS requirement (8.0 vs 13.0). 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 3 in-app purchases, starting at $14.99 per year. Whichever you choose, the download price is not the number that matters.
Lock Notes holds the better App Store score, 4.5 against 3.9. That said, the two scores are not equally well evidenced: Lock Notes has 1.1K 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 73% 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 September 12, 2026 and September 30, 2026 respectively.
| Parameter | Private Notes and Secret Diary | Lock Notes |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (8 ratings) | 4.5 (1.1K ratings) — better |
| Positive reviews | 38.5% of reviews | 73.2% of reviews — better |
| Number of ratings | 8 | 1.1K — 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 | 13.0 |
| Further details — not scored | ||
| Size | 6 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Tigran Mkhitaryan | JulyApps Ltd |
Customer experience
Private Notes and Secret Diary
Lock Notes
Bugs and requests
Private Notes and Secret Diary
Not enough reviews yet to summarise bugs or requests.
Lock Notes
Reported bugs
3 issues- Notes disappearing after updates
- Inability to access notes after device reset
- Sync issues between devices
Requested features
5 requests- Advanced formatting options
- Ability to change passcode
- Improved search capabilities
- Folder/organization system
- Better backup and restore options
In-app purchases
Private Notes and Secret Diary
- Remove Ads$1.99
Lock Notes
- Auto Backup$14.991 Year
- Unlimited Notes$4.99
- Lock Notes Pro$9.99
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?
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