# Lumen vs Overlay One

Lumen and Overlay One are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Lumen ships an update every 2 weeks, Overlay One fortnightly. The most recent releases landed on September 28, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Lumen | Overlay One |
| --- | --- | --- |
| 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 | **Every 2 weeks** | Fortnightly |
| Monetization | Free | — |
| Size | 28 MB | 21 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [Daniel Kosukhin](https://appshunter.io/developer/1852657475) | [玉苏甫江 艾西热甫](https://appshunter.io/developer/1085611107) |

## 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


### Overlay One

[App page](https://appshunter.io/ios/app/overlay-one/id6770309850)

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

**In-app purchases:** none


## Frequently asked questions

### Is Lumen free?

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

### Is Overlay One free?

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

### Do Lumen or Overlay One have ads?

Neither Lumen nor Overlay One shows ads.

### Which is updated more often, Lumen or Overlay One?

Lumen ships an update every 2 weeks, and Overlay One fortnightly. Most recently, Lumen was updated on September 28, 2026 and Overlay One on October 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*