# Surf Browser APP vs Lumen

Surf Browser APP and Lumen 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.

Surf Browser APP ships an update weekly, Lumen every 2 weeks. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Surf Browser APP | 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 | **Weekly** | Every 2 weeks |
| Monetization | — | Free |
| Size | 22 MB | 28 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [Ziv Yankowitz](https://appshunter.io/developer/1814326054) | [Daniel Kosukhin](https://appshunter.io/developer/1852657475) |

## What reviewers say

### Surf Browser APP

[App page](https://appshunter.io/ios/app/surf-browser-app/id6745877886)

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

**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 Surf Browser APP free?

Surf Browser APP is free to download, with no in-app purchases.

### Is Lumen free?

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

### Do Surf Browser APP or Lumen have ads?

Neither Surf Browser APP nor Lumen shows ads.

### Which is updated more often, Surf Browser APP or Lumen?

Surf Browser APP ships an update weekly, and Lumen every 2 weeks. Most recently, Surf Browser APP was updated on November 8, 2026 and Lumen on November 5, 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.*