# ThinkFlow AI vs Second Brain Vault

The clearest difference is device support: ThinkFlow AI at 3 against Second Brain Vault's 1. ThinkFlow AI also leads on iOS requirement (17.0 vs 26.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. ThinkFlow AI sells 3 in-app purchases, starting at $0.99 per month and Second Brain Vault sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | ThinkFlow AI | Second Brain Vault |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Size | 7 MB | 2 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [林海 周](https://appshunter.io/developer/1884791330) | [Byoungho Kim](https://appshunter.io/developer/1888452963) |

## What reviewers say

### ThinkFlow AI

[App page](https://appshunter.io/ios/app/thinkflow-ai/id6760808331)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThinkFlow Basic | $0.99 | per month |
| ThinkFlow Pro | $6.99 | per year |
| ThinkFlow Lifetime | $9.99 | one-time |


### Second Brain Vault

[App page](https://appshunter.io/ios/app/second-brain-vault/id6782200821)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Second Brain Vault (Lifetime) | $17.99 | one-time |


## Frequently asked questions

### Is ThinkFlow AI free?

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

### Is Second Brain Vault free?

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

### Do ThinkFlow AI or Second Brain Vault have ads?

Neither ThinkFlow AI nor Second Brain Vault shows ads.

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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.*