# Buky vs On‑Device AI

The clearest difference is in-app purchases: Buky at none against On‑Device AI's 4. Buky also leads on iOS requirement (16.4 vs 18.0). On‑Device AI's advantage is update cadence (fortnightly vs every 6 months) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. On‑Device AI sells 4 in-app purchases, starting at $3.99 per month. Buky asks for nothing beyond the download.

Buky ships an update every 6 months, On‑Device AI fortnightly. The most recent releases landed on October 30, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Buky | On‑Device AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (163 ratings)](https://appshunter.io/ios/app/ondevice-aiprivate-workspace/id6497060890/reviews)** |
| Number of ratings | — | **163** |
| Positive reviews | — | 63.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 46 MB | 1.8 GB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 17+ |
| Developer | [Robot Utility](https://appshunter.io/developer/1714991353) | [Zijie Deng](https://appshunter.io/developer/1070117038) |

## What reviewers say

### Buky

[App page](https://appshunter.io/ios/app/buky/id6471267434)

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

**In-app purchases:** none


### On‑Device AI

[App page](https://appshunter.io/ios/app/ondevice-aiprivate-workspace/id6497060890)

Transform your device into a private AI assistant for meetings and complex tasks. Features include speaker diarization, live transcription, and specialized subagents for research, analysis, and writing. Control your AI via messaging apps, with options for 100% offline processing or cloud connectivity.

**Highlights:** Speaker Diarization for meeting transcripts, Real-time live transcription, Natural AI speech generation, Deploy specialized AI subagents, AI-powered web browser automation, Control AI via messaging apps, 100% offline processing option

**Features:** iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Member Subscription | $3.99 | per month |
| Pro Member Subscription | $34.99 | per year |
| Lifetime Pro Member | $49.99 | one-time |
| Lifetime Pro Member | $99.99 | one-time |

**What reviewers like**

- 🚀 Game-changing AI assistant
- 🔍 Powerful search functionality
- 👍 Customizable and versatile
- 🌐 Seamless multi-device experience
- 💡 Innovative character-based interactions

**What reviewers complain about**

- 🐛 Crashes on larger models
- 🔋 Heating issues on some devices
- 🔍 Slow and unreliable web search
- 💻 Buggy on macOS

**Reported bugs**

- Crashes on startup
- Model selection issues
- Inability to copy generated text

**Requested features**

- Automated multi-character conversations
- Character set saving and syncing
- Streamlined search integration
- UI optimization for icons
- Remote endpoint support for multi-agents


## Frequently asked questions

### Is Buky free?

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

### Is On‑Device AI free?

On‑Device AI is free to download, with in-app purchases available.

### Do Buky or On‑Device AI have ads?

Neither Buky nor On‑Device AI shows ads.

### Which is updated more often, Buky or On‑Device AI?

Buky ships an update every 6 months, and On‑Device AI fortnightly. Most recently, Buky was updated on October 30, 2026 and On‑Device AI on November 8, 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.*