# PDF Secure vs Nano for Stocks

The clearest difference is in-app purchases: PDF Secure at none against Nano for Stocks's 5. PDF Secure also leads on iOS requirement (13.0 vs 15.0). Nano for Stocks's advantage is update cadence (every 3 months vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. Nano for Stocks sells 5 in-app purchases, starting at $24.99 per 7 days. PDF Secure asks for nothing beyond the download.

PDF Secure ships an update every 9 months, Nano for Stocks every 3 months. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | PDF Secure | Nano for Stocks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (383 ratings)](https://appshunter.io/ios/app/pdf-secure/id1515466852/reviews)** | — |
| Number of ratings | **383** | — |
| Positive reviews | 98.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 1 MB | 33 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iSolid apps](https://appshunter.io/developer/1215383083) | [Nanjing Yibuxilong Intelligent Technology Co., Ltd](https://appshunter.io/developer/1625060172) |

## What reviewers say

### PDF Secure

[App page](https://appshunter.io/ios/app/pdf-secure/id1515466852)

Secure your PDF documents by adding password protection, ensuring they cannot be opened without authorization. You can also easily remove existing password protection from your files. This app offers a straightforward process for safeguarding your sensitive information.

**Highlights:** Password protect PDF documents, Remove PDF password protection, Cross-platform compatibility, Export to various locations, Dark mode support

**In-app purchases:** none


### Nano for Stocks

[App page](https://appshunter.io/ios/app/nano-for-stocks/id6749664061)

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kairo PRO (1 week) | $24.99 | per 7 days |
| Kairo PRO (1 month) | $69.99 | per month |
| 50 Coins | $7.99 | one-time |
| 250 Coins | $19.99 | one-time |
| 1000 Coins | $49.99 | one-time |


## Frequently asked questions

### Is PDF Secure free?

PDF Secure is free to download, with no in-app purchases.

### Is Nano for Stocks free?

Nano for Stocks is free to download, with in-app purchases available.

### Do PDF Secure or Nano for Stocks have ads?

Neither PDF Secure nor Nano for Stocks shows ads.

### Which is updated more often, PDF Secure or Nano for Stocks?

PDF Secure ships an update every 9 months, and Nano for Stocks every 3 months. Most recently, PDF Secure was updated on November 7, 2026 and Nano for Stocks on October 30, 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.*