# PDFDarkMode vs Helper One

The clearest difference is ads: PDFDarkMode at none against Helper One's shown. PDFDarkMode also leads on update cadence (every 4 days vs every 9 days) and iOS requirement (15.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. PDFDarkMode sells 5 one-off in-app purchases and Helper One sells 4 in-app purchases, starting at $17.99 per month. Whichever you choose, the download price is not the number that matters.

PDFDarkMode ships an update every 4 days, Helper One every 9 days. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | PDFDarkMode | Helper One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pdfdarkmode-customize-pdfs/id6744872327/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 9 days |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 91 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Wildcatter LLC](https://appshunter.io/developer/1229934042) | [Peter Dove](https://appshunter.io/developer/359728246) |

## What reviewers say

### PDFDarkMode

[App page](https://appshunter.io/ios/app/pdfdarkmode-customize-pdfs/id6744872327)

Easily convert PDFs to a comfortable dark mode with custom text and background colors. Reduce eye strain while reading or studying long documents. Save and revisit your personalized PDFs in a private library.

**Highlights:** Upload PDFs from device, Customize text and background colors, Preview dark mode changes, Download converted PDFs, Personal PDF library, Private by design

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Download PDF (up to 100 pages) | $0.99 | one-time |
| Dark Mode PDF Download | $2.99 | one-time |
| Download PDF (up to 500 pages) | $4.99 | one-time |
| PDFDarkMode Pro | $9.99 | one-time |
| Download PDF (500+ pages) | $9.99 | one-time |


### Helper One

[App page](https://appshunter.io/ios/app/helper-one/id6759523720)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bring Your Own Key | $17.99 | per month |
| Pro | $29.99 | per month |
| Pro "Max 5x" | $59.99 | per month |
| Pro "Max 20x" | $124.99 | per month |


## Frequently asked questions

### Is PDFDarkMode free?

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

### Is Helper One free?

Helper One is free to download, with in-app purchases available.

### Do PDFDarkMode or Helper One have ads?

Helper One shows ads; PDFDarkMode does not.

### Which is updated more often, PDFDarkMode or Helper One?

PDFDarkMode ships an update every 4 days, and Helper One every 9 days. Most recently, PDFDarkMode was updated on October 13, 2026 and Helper One 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.*