# Lock Notes vs ChemTECH 2026

The clearest difference is in-app purchases: ChemTECH 2026 at none against Lock Notes's 7. ChemTECH 2026 also leads on update cadence (every 4 days vs every 10 days) and iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Lock Notes sells 7 in-app purchases, starting at $4.99 per 7 days. ChemTECH 2026 asks for nothing beyond the download.

Lock Notes ships an update every 10 days, ChemTECH 2026 every 4 days. The most recent releases landed on October 21, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Lock Notes | ChemTECH 2026 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (138 ratings)](https://appshunter.io/ios/app/lock-notes-private-journal/id1211884686/reviews)** | — |
| Number of ratings | **138** | — |
| Positive reviews | 54.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | Subscription | — |
| Size | 23 MB | 70 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [LYKOV STUDIO LTD](https://appshunter.io/developer/1783754094) | [Tarun Lalan](https://appshunter.io/developer/931938808) |

## What reviewers say

### Lock Notes

[App page](https://appshunter.io/ios/app/lock-notes-private-journal/id1211884686)

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.

**Highlights:** 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

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Weekly | $4.99 | per 7 days |
| Monthly | $7.99 | per month |
| Annual | $29.99 | per year |
| Annual | $29.99 | per year |
| Disable ads | $0.99 | one-time |
| Lifetime | $39.99 | one-time |


### ChemTECH 2026

[App page](https://appshunter.io/ios/app/chemtech-2026/id6755063166)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Lock Notes free?

Lock Notes is free to download, with in-app purchases available.

### Is ChemTECH 2026 free?

ChemTECH 2026 is free to download, with no in-app purchases.

### Do Lock Notes or ChemTECH 2026 have ads?

Neither Lock Notes nor ChemTECH 2026 shows ads.

### Which is updated more often, Lock Notes or ChemTECH 2026?

Lock Notes ships an update every 10 days, and ChemTECH 2026 every 4 days. Most recently, Lock Notes was updated on October 21, 2026 and ChemTECH 2026 on October 12, 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.*