# Private Notes Lock vs CrossPrism Nature Guide

The clearest difference is rating: CrossPrism Nature Guide at 5.0 against Private Notes Lock's 3.0. CrossPrism Nature Guide also leads on ads (none vs shown) and update cadence (every 5 weeks vs every 4 months). Private Notes Lock's advantage is iOS requirement (14.0 vs 16.4). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CrossPrism Nature Guide holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

Private Notes Lock ships an update every 4 months, CrossPrism Nature Guide every 5 weeks. The most recent releases landed on June 7, 2026 and August 15, 2026 respectively.

## The numbers

| Metric | Private Notes Lock | CrossPrism Nature Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/private-notes-lock-notepad/id1341597096/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/crossprism-nature-guide/id6449553805/reviews)** |
| Number of ratings | **4** | 2 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Ad-supported | **Free** |
| Size | 7 MB | 374 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bhargav Narola](https://appshunter.io/developer/1045586550) | [Excelsis Consulting](https://appshunter.io/developer/305582164) |

## What reviewers say

### Private Notes Lock

[App page](https://appshunter.io/ios/app/private-notes-lock-notepad/id1341597096)

Securely store your written and voice notes with a passcode or Touch ID. This app allows you to create, save, and play notes, with options to add multiple photos. Manual data backup is recommended.

**Highlights:** Passcode protection, Touch ID access, Create written notes, Save audio notes, Add multiple photos to notes, Play audio notes

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

**In-app purchases:** none


### CrossPrism Nature Guide

[App page](https://appshunter.io/ios/app/crossprism-nature-guide/id6449553805)

Explore and identify plants, fungi, and animals using your phone's camera. Document your discoveries with photos and notes to create your own nature journal. This app works offline, making it perfect for exploring remote areas.

**Highlights:** Offline identification, Real-time recognition, Extensive species database, Photo documentation, Personal nature journal, Supports multiple categories

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Private Notes Lock free?

Private Notes Lock is free to download, with no in-app purchases.

### Is CrossPrism Nature Guide free?

CrossPrism Nature Guide is free to download, with no in-app purchases.

### Which has better reviews, Private Notes Lock or CrossPrism Nature Guide?

CrossPrism Nature Guide is rated higher. Private Notes Lock averages 3.0 out of 5 from 4 ratings, while CrossPrism Nature Guide averages 5.0 from 2 ratings.

### Do Private Notes Lock or CrossPrism Nature Guide have ads?

Private Notes Lock shows ads; CrossPrism Nature Guide does not.

### Which is updated more often, Private Notes Lock or CrossPrism Nature Guide?

Private Notes Lock ships an update every 4 months, and CrossPrism Nature Guide every 5 weeks. Most recently, Private Notes Lock was updated on June 7, 2026 and CrossPrism Nature Guide on August 15, 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.*