# Denlog vs Second Brain

The clearest difference is in-app purchases: Second Brain at none against Denlog's 1. Denlog's advantage is iOS requirement (15.1 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Denlog sells 1 in-app purchase, starting at $9.99 per month. Second Brain asks for nothing beyond the download.

Denlog ships an update every 4 days, Second Brain every 2 days. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Denlog | Second Brain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 2 days** |
| Size | 44 MB | 26 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GR Bridge Solution Korlatolt Felelossegu Tarsasag](https://appshunter.io/developer/1850469110) | [kim dahye](https://appshunter.io/developer/1868391710) |

## What reviewers say

### Denlog

[App page](https://appshunter.io/ios/app/denlog-smart-ai-todo-list/id6771740512)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Denlog Pro | $9.99 | per month |


### Second Brain

[App page](https://appshunter.io/ios/app/second-brain-ai-note/id6799343264)

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

**In-app purchases:** none


## Frequently asked questions

### Is Denlog free?

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

### Is Second Brain free?

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

### Do Denlog or Second Brain have ads?

Neither Denlog nor Second Brain shows ads.

### Which is updated more often, Denlog or Second Brain?

Denlog ships an update every 4 days, and Second Brain every 2 days. Most recently, Denlog was updated on October 6, 2026 and Second Brain on October 10, 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.*