# Lumen vs Pad Notes AI

The clearest difference is in-app purchases: Lumen at none against Pad Notes AI's 1. Pad Notes AI's advantage is update cadence (daily vs every 2 weeks) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Pad Notes AI sells 1 one-off in-app purchase. Lumen asks for nothing beyond the download.

Lumen ships an update every 2 weeks, Pad Notes AI daily. The most recent releases landed on October 14, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Lumen | Pad Notes AI |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Monetization | Free | — |
| Size | 28 MB | 685 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [Daniel Kosukhin](https://appshunter.io/developer/1852657475) | [Hung Tien Pham](https://appshunter.io/developer/1896766758) |

## What reviewers say

### 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


### Pad Notes AI

[App page](https://appshunter.io/ios/app/pad-notes-ai-smart-notebooks/id6779363432)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $9.99 | one-time |


## Frequently asked questions

### Is Lumen free?

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

### Is Pad Notes AI free?

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

### Do Lumen or Pad Notes AI have ads?

Neither Lumen nor Pad Notes AI shows ads.

### Which is updated more often, Lumen or Pad Notes AI?

Lumen ships an update every 2 weeks, and Pad Notes AI daily. Most recently, Lumen was updated on October 14, 2026 and Pad Notes AI on October 19, 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.*