# 3rd Brain | Couples Organizer vs Arca

The clearest difference is in-app purchases: Arca at none against 3rd Brain | Couples Organizer's 1. Arca also leads on iOS requirement (15.1 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 3rd Brain | Couples Organizer sells 1 in-app purchase, starting at $7.99 per month. Arca asks for nothing beyond the download.

3rd Brain | Couples Organizer ships an update weekly, Arca every 6 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 3rd Brain | Couples Organizer | Arca |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/3rd-brain-couples-organizer/id6476935088/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 6 days** |
| Monetization | Freemium | — |
| Size | 44 MB | 48 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [3rd Brain, Inc](https://appshunter.io/developer/1728321268) | [GRE Development Ltd](https://appshunter.io/developer/1810332846) |

## What reviewers say

### 3rd Brain | Couples Organizer

[App page](https://appshunter.io/ios/app/3rd-brain-couples-organizer/id6476935088)

This AI-powered productivity tool helps couples manage shared tasks, lists, and notes. It organizes information, assigns ownership, and allows for private entries, fostering better communication and appreciation.

**Highlights:** AI-powered task organization, Shared and private lists, Daily focus tab, Mutual appreciation features, Secure and private data

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3rd Brain Access | $7.99 | per month |


### Arca

[App page](https://appshunter.io/ios/app/arca-modern-task-management/id6761739879)

**In-app purchases:** none


## Frequently asked questions

### Is 3rd Brain | Couples Organizer free?

3rd Brain | Couples Organizer is free to download, with in-app purchases available.

### Is Arca free?

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

### Do 3rd Brain | Couples Organizer or Arca have ads?

Neither 3rd Brain | Couples Organizer nor Arca shows ads.

### Which is updated more often, 3rd Brain | Couples Organizer or Arca?

3rd Brain | Couples Organizer ships an update weekly, and Arca every 6 days. Most recently, 3rd Brain | Couples Organizer was updated on October 30, 2026 and Arca on October 25, 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.*