# PDF Reader vs Energizer AI

The clearest difference is ads: Energizer AI at none against PDF Reader's shown. Energizer AI also leads on device support (3 vs 1). PDF Reader's advantage is update cadence (every 4 days vs every 3 weeks). On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. PDF Reader sells 1 in-app purchase, starting at $19.99 per 7 days and Energizer AI sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

PDF Reader ships an update every 4 days, Energizer AI every 3 weeks. Both last shipped on October 6, 2026.

## The numbers

| Metric | PDF Reader | Energizer AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/pdf-reader-smart-reader/id6756703231/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | Ad-supported | — |
| Size | 85 MB | 48 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [truong nguyen xuan](https://appshunter.io/developer/552933291) | [FORGE TECH](https://appshunter.io/developer/6794371510) |

## What reviewers say

### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-smart-reader/id6756703231)

This app is a fast and lightweight document viewer for PDF, Word, Excel, and PowerPoint files. It offers smart file management, offline access, and easy sharing, making it ideal for students and professionals. Enjoy a seamless reading experience with features like search, bookmarks, and dark mode.

**Highlights:** All-in-one document viewer (PDF, DOCX, XLSX, PPTX, TXT), Smart file manager, Offline document access, Fast and smooth performance, Search and bookmarking, Dark mode support, Easy document sharing

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription - 1 week | $19.99 | per 7 days |


### Energizer AI

[App page](https://appshunter.io/ios/app/energizer-ai-routine-planner/id6794371507)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Energizer Pro Monthly | $7.99 | per month |
| Energizer AI pro yearly | $69.99 | per year |


## Frequently asked questions

### Is PDF Reader free?

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

### Is Energizer AI free?

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

### Do PDF Reader or Energizer AI have ads?

PDF Reader shows ads; Energizer AI does not.

### Which is updated more often, PDF Reader or Energizer AI?

PDF Reader ships an update every 4 days, and Energizer AI every 3 weeks. Most recently, PDF Reader was updated on October 6, 2026 and Energizer AI on October 6, 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.*