# On‑Device AI vs PromptMaster

The clearest difference is device support: On‑Device AI at 4 against PromptMaster's 2. On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. On‑Device AI sells 4 in-app purchases, starting at $3.99 per month and PromptMaster sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | On‑Device AI | PromptMaster |
| --- | --- | --- |
| 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 | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | — |
| Monetization | Free with in-app purchases | — |
| Size | 1.8 GB | 8 MB |
| Requires iOS | **18.0** | 18.2 |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Zijie Deng](https://appshunter.io/developer/1070117038) | [Elena Kryvytska](https://appshunter.io/developer/1364086158) |

## What reviewers say

### 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

**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


### PromptMaster

[App page](https://appshunter.io/ios/app/promptmaster/id6744132613)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $1.99 | per month |
| Annual Premium | $14.99 | per year |


## Frequently asked questions

### Is On‑Device AI free?

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

### Is PromptMaster free?

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

### Do On‑Device AI or PromptMaster have ads?

Neither On‑Device AI nor PromptMaster shows ads.

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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.*