# MindMark AI vs Second Brain

The clearest difference is rating: MindMark AI at 5.0 against Second Brain's 4.0. MindMark AI also leads on monetization model (free vs freemium). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. MindMark AI sells 2 in-app purchases, starting at $9.99 per month and Second Brain sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

MindMark AI holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

MindMark AI ships an update every 4 days, Second Brain weekly. The most recent releases landed on September 26, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | MindMark AI | Second Brain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mindmark-ai-second-brain/id6749483055/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/second-brain-know-yourself/id6760254340/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | **Free** | Freemium |
| Size | 25 MB | 12 MB |
| Requires iOS | 18.5 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nir Portiansky](https://appshunter.io/developer/1828915914) | [Liwei Xie](https://appshunter.io/developer/1106616046) |

## What reviewers say

### MindMark AI

[App page](https://appshunter.io/ios/app/mindmark-ai-second-brain/id6749483055)

Capture, organize, and instantly find information from various sources. This AI-powered tool automatically summarizes content and uses smart search to retrieve anything you need. Collaborate with others through shared folders for seamless idea exchange.

**Highlights:** Instant capture of links, text, and screenshots, AI-generated summaries and insights, Smart search by keyword, concept, or context, Automatic tagging and collection organization, Collaborative shared folders, Private and secure data storage

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MindMark Pro - Monthly | $9.99 | per month |
| MindMark Pro - Yearly | $69.99 | per year |


### Second Brain

[App page](https://appshunter.io/ios/app/second-brain-know-yourself/id6760254340)

This AI-powered journal captures your thoughts via voice or text, automatically organizing and connecting them. It helps you recall memories, discover patterns, and reflect on your growth.

**Highlights:** AI classification, tagging, and summarization, Semantic search by meaning, Three-layer memory system, People cards for relationship tracking, Weekly AI reflections, Voice input with transcription, Data export (JSON + Markdown)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Second Brain Pro | $4.99 | per month |
| Second Brain Pro | $39.99 | per year |


## Frequently asked questions

### Is MindMark AI free?

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

### Is Second Brain free?

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

### Which has better reviews, MindMark AI or Second Brain?

MindMark AI is rated higher. MindMark AI averages 5.0 out of 5 from 1 ratings, while Second Brain averages 4.0 from 1 ratings.

### Do MindMark AI or Second Brain have ads?

Neither MindMark AI nor Second Brain shows ads.

### Which is updated more often, MindMark AI or Second Brain?

MindMark AI ships an update every 4 days, and Second Brain weekly. Most recently, MindMark AI was updated on September 26, 2026 and Second Brain on September 24, 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.*