# Drag PDF vs Lumen

The clearest difference is update cadence: Lumen at every 2 weeks against Drag PDF's monthly. Drag PDF's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 18.0). On price, ads and in-app purchases there is nothing between them.

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

Drag PDF ships an update monthly, Lumen every 2 weeks. The most recent releases landed on October 4, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Drag PDF | Lumen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/lumen-knowledge-browser/id6762682475/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 31 MB | 28 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Victor Carreras](https://appshunter.io/developer/1514435504) | [Daniel Kosukhin](https://appshunter.io/developer/1852657475) |

## What reviewers say

### Drag PDF

[App page](https://appshunter.io/ios/app/drag-pdf/id1640647538)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lumen

[App page](https://appshunter.io/ios/app/lumen-knowledge-browser/id6762682475)

This app acts as a browser that remembers what you read, building a personal knowledge base from engaged pages. It allows you to ask questions in plain English about your reading history, with answers generated by an on-device AI. All your data remains private and offline.

**Highlights:** On-device AI knowledge base, Plain English questioning, Automatic content organization, Private and offline browsing, Tracker blocking, Source citation for answers

**In-app purchases:** none


## Frequently asked questions

### Is Drag PDF free?

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

### Is Lumen free?

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

### Do Drag PDF or Lumen have ads?

Neither Drag PDF nor Lumen shows ads.

### Which is updated more often, Drag PDF or Lumen?

Drag PDF ships an update monthly, and Lumen every 2 weeks. Most recently, Drag PDF was updated on October 4, 2026 and Lumen on September 28, 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.*