# DEVONthink To Go 4 vs 4DI

The clearest difference is in-app purchases: 4DI at none against DEVONthink To Go 4's 2. 4DI also leads on update cadence (weekly vs every 3 weeks) and iOS requirement (18.6 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. DEVONthink To Go 4 sells 2 in-app purchases, starting at $2.99 per month. 4DI asks for nothing beyond the download.

DEVONthink To Go 4 ships an update every 3 weeks, 4DI weekly. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | DEVONthink To Go 4 | 4DI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (258 ratings)](https://appshunter.io/ios/app/devonthink-to-go-4/id6532619226/reviews)** | — |
| Number of ratings | **258** | — |
| Positive reviews | 44.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 193 MB | 5 MB |
| Requires iOS | 26.0 | **18.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [DEVONtechnologies, LLC](https://appshunter.io/developer/395722473) | [Robert Poetzsch](https://appshunter.io/developer/1860642630) |

## What reviewers say

### DEVONthink To Go 4

[App page](https://appshunter.io/ios/app/devonthink-to-go-4/id6532619226)

Manage your entire knowledge library on your iPad and iPhone. Organize, edit, and annotate documents, notes, and more. Leverage generative AI for summaries, content creation, and advanced search. Syncs privately and securely across devices.

**Highlights:** Document organization and management, AI-powered summaries and content creation, PDF annotation and editing, On-device OCR for searchable documents, Cross-device secure synchronization, Custom metadata and tagging, Shortcuts automation

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Yearly | $19.99 | per year |


### 4DI

[App page](https://appshunter.io/ios/app/4di-data-integrity-tool/id6760180866)

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

**In-app purchases:** none


## Frequently asked questions

### Is DEVONthink To Go 4 free?

DEVONthink To Go 4 is free to download, with in-app purchases available.

### Is 4DI free?

4DI is free to download, with no in-app purchases.

### Do DEVONthink To Go 4 or 4DI have ads?

Neither DEVONthink To Go 4 nor 4DI shows ads.

### Which is updated more often, DEVONthink To Go 4 or 4DI?

DEVONthink To Go 4 ships an update every 3 weeks, and 4DI weekly. Most recently, DEVONthink To Go 4 was updated on October 27, 2026 and 4DI 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.*