# US Historical Documents vs Private Notes Lock

The clearest difference is price: Private Notes Lock at Free against US Historical Documents's $0.99. Private Notes Lock also leads on update cadence (every 4 months vs every 15 months). US Historical Documents's advantage is rating (4.6 vs 3.0) and review sentiment (75% vs 33%). On in-app purchases and device support there is nothing between them.

Private Notes Lock is free to download; US Historical Documents costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

US Historical Documents holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: US Historical Documents has 20 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 75% of US Historical Documents's written reviews are positive against 33% of Private Notes Lock's.

US Historical Documents ships an update every 15 months, Private Notes Lock every 4 months. The most recent releases landed on September 9, 2026 and June 7, 2026 respectively.

## The numbers

| Metric | US Historical Documents | Private Notes Lock |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.6 (20 ratings)](https://appshunter.io/ios/app/us-historical-documents/id891748525/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/private-notes-lock-notepad/id1341597096/reviews) |
| Number of ratings | **20** | 4 |
| Positive reviews | **75.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 15 months | **Every 4 months** |
| Monetization | Paid | **Ad-supported** |
| Best chart rank | **#196** | — |
| Size | 19 MB | 7 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Workman Consulting LLC](https://appshunter.io/developer/430118017) | [Bhargav Narola](https://appshunter.io/developer/1045586550) |

## What reviewers say

### US Historical Documents

[App page](https://appshunter.io/ios/app/us-historical-documents/id891748525)

**Currently charting:** #196 Top Paid · Reference (US App Store)

Access over 400 influential U.S. historical documents, laws, speeches, and court cases. This app allows you to search, annotate, highlight, and email documents, all stored locally for offline access.

**Highlights:** Over 400 historical documents, Offline document storage, Searchable content, Add notes and highlights, Email documents, Sort by date or type

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is US Historical Documents free?

US Historical Documents costs $0.99, with no in-app purchases.

### Is Private Notes Lock free?

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

### Which has better reviews, US Historical Documents or Private Notes Lock?

US Historical Documents is rated higher. US Historical Documents averages 4.6 out of 5 from 20 ratings, while Private Notes Lock averages 3.0 from 4 ratings.

### Do US Historical Documents or Private Notes Lock have ads?

Private Notes Lock shows ads; US Historical Documents does not.

### Which is updated more often, US Historical Documents or Private Notes Lock?

US Historical Documents ships an update every 15 months, and Private Notes Lock every 4 months. Most recently, US Historical Documents was updated on September 9, 2026 and Private Notes Lock on June 7, 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.*