# ChatInbox vs SecondBrain Pro

The clearest difference is update cadence: ChatInbox at every 5 days against SecondBrain Pro's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ChatInbox sells 3 in-app purchases, starting at $2.99 per month and SecondBrain Pro sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ChatInbox ships an update every 5 days, SecondBrain Pro every 2 months. Both last shipped on September 17, 2026.

## The numbers

| Metric | ChatInbox | SecondBrain Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (29 ratings)](https://appshunter.io/ios/app/chatinbox-email-by-sender/id6462772788/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 61.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 45 MB | 10 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Innovatism LLC](https://appshunter.io/developer/955315491) | [Heinrich Krupp](https://appshunter.io/developer/1866842398) |

## What reviewers say

### ChatInbox

[App page](https://appshunter.io/ios/app/chatinbox-email-by-sender/id6462772788)

This app reimagines your email by organizing it around people, not dates. View all conversations with a contact in a chat-style format, making it easy to find past messages and attachments. It supports multiple email accounts and devices, offering a streamlined inbox experience.

**Highlights:** Contact-centered inbox, All accounts in one inbox, Smart contact grouping, Attachments by person, Calendar view, Email reminders

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $2.99 | per month |
| Premium Yearly | $19.99 | per year |
| Premium Lifetime | $24.99 | one-time |


### SecondBrain Pro

[App page](https://appshunter.io/ios/app/secondbrain-pro/id6757423935)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $7.99 | one-time |
| SecondBrain PREMIUM | $17.99 | one-time |


## Frequently asked questions

### Is ChatInbox free?

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

### Is SecondBrain Pro free?

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

### Do ChatInbox or SecondBrain Pro have ads?

Neither ChatInbox nor SecondBrain Pro shows ads.

### Which is updated more often, ChatInbox or SecondBrain Pro?

ChatInbox ships an update every 5 days, and SecondBrain Pro every 2 months. Most recently, ChatInbox was updated on September 17, 2026 and SecondBrain Pro on September 17, 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.*