# TopicFlow vs 2sBrain

TopicFlow and 2sBrain 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. TopicFlow sells 3 in-app purchases, starting at $4.99 per month and 2sBrain sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

TopicFlow ships an update every 9 days, 2sBrain weekly. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | TopicFlow | 2sBrain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/topicflow-ai-notes/id6765620478/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | Freemium | — |
| Size | 67 MB | 66 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [亦君 潘](https://appshunter.io/developer/1889920920) | [Nguyen Nhu Vuong](https://appshunter.io/developer/1486864462) |

## What reviewers say

### TopicFlow

[App page](https://appshunter.io/ios/app/topicflow-ai-notes/id6765620478)

This app transforms AI conversations into structured, reusable notes, plans, and summaries. It allows users to branch discussions for focused follow-ups and capture key ideas before they are lost. Organize your AI-generated content locally and export it when ready.

**Highlights:** Transform AI chats into reusable notes, Branch conversations for focused follow-ups, Capture and organize key ideas, Refocus AI discussions without re-prompting, Export and share selected content, Local topic history organization, Connect own AI provider keys

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TopicFlow Monthly Subscription | $4.99 | per month |
| TopicFlow Yearly Subscription | $29.99 | per year |
| TopicFlow Lifetime Access | $69.99 | one-time |


### 2sBrain

[App page](https://appshunter.io/ios/app/2sbrainai-pdf-document-reader/id6768344372)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Monthly | $3.99 | per month |
| VIP Yearly | $19.99 | per year |
| VIP Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is TopicFlow free?

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

### Is 2sBrain free?

2sBrain is free to download, with in-app purchases available.

### Do TopicFlow or 2sBrain have ads?

Neither TopicFlow nor 2sBrain shows ads.

### Which is updated more often, TopicFlow or 2sBrain?

TopicFlow ships an update every 9 days, and 2sBrain weekly. Most recently, TopicFlow was updated on October 14, 2026 and 2sBrain on October 8, 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.*