# Mem vs Second Brain

Mem and Second Brain both sit at 4.4 stars, but that hides the real split: 100% of Second Brain's written reviews are positive against 41% of Mem's. Mem's advantage is ratings volume (130 vs 2) and update cadence (every 3 days vs every 8 days). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Mem sells 10 in-app purchases, starting at $9.00 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.

On the App Store both sit at effectively the same score — 4.4 for Mem against 4.5 for Second Brain. That said, the two scores are not equally well evidenced: Mem has 130 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 41% of Mem's written reviews are positive against 100% of Second Brain's.

Mem ships an update every 3 days, Second Brain every 8 days. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Mem | Second Brain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (130 ratings)](https://appshunter.io/ios/app/mem-your-personal-ai-agent/id1578757028/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/second-brain-know-yourself/id6760254340/reviews)** |
| Number of ratings | **130** | 2 |
| Positive reviews | 41.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 8 days |
| Monetization | Free with in-app purchases | Freemium |
| Size | 99 MB | 12 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mem Labs, Inc.](https://appshunter.io/developer/1030154393) | [Liwei Xie](https://appshunter.io/developer/1106616046) |

## What reviewers say

### Mem

[App page](https://appshunter.io/ios/app/mem-your-personal-ai-agent/id1578757028)

This app acts as an AI-powered thought partner, capturing and organizing your ideas, meetings, and research. It allows you to use voice to create and edit notes, and an AI assistant can recall, summarize, and reorganize your information. It also surfaces relevant notes automatically and offers powerful search capabilities.

**Highlights:** Voice-to-text note creation and editing, AI-powered summarization and recall, Automatic organization and structuring of notes, Intelligent surfacing of related information, Deep search for any note, Cross-device synchronization, Offline access

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mem Plus | $9.00 | per month |
| Pro | $12.00 | per month |
| Mem Pro | $29.00 | per month |
| Proactive | $29.00 | per month |
| Mem Pro 2x | $49.00 | per month |
| Proactive | $59.00 | per month |
| Mem Pro 5x | $99.00 | per month |
| Proactive | $99.00 | per month |
| Mem Pro 10x | $149.00 | per month |
| Mem Pro 20x | $199.00 | per month |

**What reviewers like**

- 🤖 AI-powered note organization and auto-categorization
- 💬 Integrated ChatGPT/AI chat assistant for research and synthesis
- 🎙️ Voice-to-text transcription with formatting
- 🔗 Intelligent linking of related notes
- ⚡ Fast and intuitive interface design

**What reviewers complain about**

- 🐛 Frequent app crashes and freezes
- 🔄 Unreliable syncing between devices
- 📱 iOS app significantly less featured than desktop version
- 🔐 Requires Google/Apple login (no email option)
- 💾 Data loss and notes disappearing unexpectedly

**Reported bugs**

- Notes disappearing without trace or recovery option
- Bottom navigation bar covering key buttons
- Settings popup incorrectly prompts to download app already installed
- Black bar covering AI tool input field on web version
- Photos not saving or disappearing after one day

**Requested features**

- True hands-free voice activation with Siri shortcuts
- Widget support for voice notes and Apple Watch
- Node/mind map graph visualization of note connections
- PDF and document export functionality
- Full markdown support


### Second Brain

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

Capture thoughts and ideas effortlessly with voice or text input. This app analyzes your weekly entries to provide personalized insights and summaries. It helps you recall past information and manage personal contacts with smart reminders and widgets.

**Highlights:** Weekly self-insight summaries, Voice and text note capture, Search notes by meaning, Contact management with reminders, Home and Lock Screen widgets, Optional iCloud sync, 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 Mem free?

Mem 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, Mem or Second Brain?

Second Brain is rated higher. Mem averages 4.4 out of 5 from 130 ratings, while Second Brain averages 4.5 from 2 ratings.

### Do Mem or Second Brain have ads?

Neither Mem nor Second Brain shows ads.

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

Mem ships an update every 3 days, and Second Brain every 8 days. Most recently, Mem was updated on November 7, 2026 and Second Brain on November 5, 2026.

---

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