# DEVONthink To Go 4 vs Private AI

The clearest difference is price: DEVONthink To Go 4 at Free against Private AI's $4.99. Private AI's advantage is in-app purchases (none vs 2) and update cadence (every 2 days vs every 3 weeks). On ads, device support and iOS requirement there is nothing between them.

DEVONthink To Go 4 is free to download; Private AI costs $4.99 up front. DEVONthink To Go 4 sells 2 in-app purchases, starting at $2.99 per month. Private AI asks for nothing beyond the download.

DEVONthink To Go 4 ships an update every 3 weeks, Private AI every 2 days. The most recent releases landed on September 23, 2026 and July 30, 2026 respectively.

## The numbers

| Metric | DEVONthink To Go 4 | Private AI |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.7 (226 ratings)](https://appshunter.io/ios/app/devonthink-to-go-4/id6532619226/reviews)** | — |
| Number of ratings | **226** | — |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | — | **#195** |
| Size | 191 MB | 6 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [DEVONtechnologies, LLC](https://appshunter.io/developer/395722473) | [GTechnologies LLC](https://appshunter.io/developer/1813624050) |

## 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 |


### Private AI

[App page](https://appshunter.io/ios/app/private-ai-document-chat/id6757301317)

**Currently charting:** #195 Top Paid · Productivity (US App Store)

**Features:** macOS Compatibility

**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 Private AI free?

Private AI costs $4.99, with no in-app purchases.

### Do DEVONthink To Go 4 or Private AI have ads?

Neither DEVONthink To Go 4 nor Private AI shows ads.

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

DEVONthink To Go 4 ships an update every 3 weeks, and Private AI every 2 days. Most recently, DEVONthink To Go 4 was updated on September 23, 2026 and Private AI on July 30, 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.*