# XDM AI vs Lumen

The clearest difference is in-app purchases: Lumen at none against XDM AI's 1. Lumen also leads on update cadence (every 2 weeks vs every 5 weeks). XDM AI's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 18.0). On price and ads there is nothing between them.

Both are free to download. XDM AI sells 1 in-app purchase, starting at $5.99 per month. Lumen asks for nothing beyond the download.

XDM AI ships an update every 5 weeks, Lumen every 2 weeks. The most recent releases landed on September 11, 2026 and June 28, 2026 respectively.

## The numbers

| Metric | XDM AI | 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 72 MB | 28 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [Yassine Elbouazzi](https://appshunter.io/developer/1848247986) | [Daniel Kosukhin](https://appshunter.io/developer/1852657475) |

## What reviewers say

### XDM AI

[App page](https://appshunter.io/ios/app/xdm-ai-smart-browser/id6754417041)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $5.99 | per month |


### 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 XDM AI free?

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

### Is Lumen free?

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

### Do XDM AI or Lumen have ads?

Neither XDM AI nor Lumen shows ads.

### Which is updated more often, XDM AI or Lumen?

XDM AI ships an update every 5 weeks, and Lumen every 2 weeks. Most recently, XDM AI was updated on September 11, 2026 and Lumen on June 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.*