# Box for Thought vs CRTX

The clearest difference is update cadence: Box for Thought at every 5 weeks against CRTX's every 5 months. Box for Thought also leads on iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Box for Thought sells 3 in-app purchases, starting at $1.99 per month and CRTX sells 4 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Box for Thought ships an update every 5 weeks, CRTX every 5 months. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Box for Thought | CRTX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/crtx/id6761746898/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 5 months |
| Monetization | — | Free with in-app purchases |
| Size | 59 MB | 25 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Flying Fish Mart Technology Co.,Ltd.](https://appshunter.io/developer/1674548259) | [Lars Janssen](https://appshunter.io/developer/1891252260) |

## What reviewers say

### Box for Thought

[App page](https://appshunter.io/ios/app/box-for-thought-daily-diary/id6754834014)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Quarterly | $3.99 | per 3 months |
| Annual | $14.99 | per year |


### CRTX

[App page](https://appshunter.io/ios/app/crtx/id6761746898)

This app acts as a shared digital memory for your household, allowing you to save voice notes, photos, links, and documents. You can then ask questions in plain English to retrieve information saved by anyone in your group.

**Highlights:** Capture voice notes, photos, links, and PDFs, Search contents using natural language, Create private or shared memory pools, Assign and track tasks within shared pools, Automatic recognition of people in saved items, Apple Watch and share extension support

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CRTX Personal Monthly | $7.99 | per month |
| CRTX Family Monthly | $12.99 | per month |
| CRTX Personal Annual | $69.99 | per year |
| CRTX Family Annual | $119.99 | per year |


## Frequently asked questions

### Is Box for Thought free?

Box for Thought is free to download, with in-app purchases available.

### Is CRTX free?

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

### Do Box for Thought or CRTX have ads?

Neither Box for Thought nor CRTX shows ads.

### Which is updated more often, Box for Thought or CRTX?

Box for Thought ships an update every 5 weeks, and CRTX every 5 months. Most recently, Box for Thought was updated on November 5, 2026 and CRTX on October 31, 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.*