# Second Brain vs Mercury Voice

Second Brain and Mercury Voice are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Second Brain | Mercury Voice |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Size | 21 MB | 3 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Konstantin Akushev](https://appshunter.io/developer/1879211261) | [Spencer McGuire](https://appshunter.io/developer/6806375299) |

## What reviewers say

### Second Brain

[App page](https://appshunter.io/ios/app/second-brain-voice-notes/id6759515692)

**In-app purchases:** none


### Mercury Voice

[App page](https://appshunter.io/ios/app/mercury-voice/id6806404418)

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

**In-app purchases:** none


## Frequently asked questions

### Is Second Brain free?

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

### Is Mercury Voice free?

Mercury Voice is free to download, with no in-app purchases.

### Do Second Brain or Mercury Voice have ads?

Neither Second Brain nor Mercury Voice 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.*