# Lumen vs Keepy

The clearest difference is in-app purchases: Lumen at none against Keepy's 2. Keepy's advantage is update cadence (every 5 days vs every 2 weeks) and iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Keepy sells 2 in-app purchases, starting at $3.99 per month. Lumen asks for nothing beyond the download.

Lumen ships an update every 2 weeks, Keepy every 5 days. The most recent releases landed on November 5, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Lumen | Keepy |
| --- | --- | --- |
| 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 | **Every 5 days** |
| Monetization | Free | — |
| Size | 28 MB | 35 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Daniel Kosukhin](https://appshunter.io/developer/1852657475) | [OSLOUX](https://appshunter.io/developer/6795494342) |

## 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


### Keepy

[App page](https://appshunter.io/ios/app/keepy-smart-reminder/id6795494340)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Keepy Premium Monthly | $3.99 | per month |
| Keepy Premium Yearly | $34.99 | per year |


## Frequently asked questions

### Is Lumen free?

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

### Is Keepy free?

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

### Do Lumen or Keepy have ads?

Neither Lumen nor Keepy shows ads.

### Which is updated more often, Lumen or Keepy?

Lumen ships an update every 2 weeks, and Keepy every 5 days. Most recently, Lumen was updated on November 5, 2026 and Keepy on October 29, 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.*