# Vector Space AI vs Arbiter

The clearest difference is in-app purchases: Vector Space AI at none against Arbiter's 4. Vector Space AI also leads on update cadence (every 4 days vs fortnightly). On price, review sentiment, ads and monetization model there is nothing between them.

Both are free to download. Arbiter sells 4 one-off in-app purchases. Vector Space AI asks for nothing beyond the download.

Vector Space AI ships an update every 4 days, Arbiter fortnightly. Both last shipped on October 8, 2026.

## The numbers

| Metric | Vector Space AI | Arbiter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (16 ratings)](https://appshunter.io/ios/app/arbiter-local-ai-chat/id6747954532/reviews)** |
| Number of ratings | — | **16** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Fortnightly |
| Monetization | Free | Free |
| Size | 34 MB | 40 MB |
| Requires iOS | **18.0** | 18.4 |
| Devices | iPhone, iPad | iPhone, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Voila Tech K.K](https://appshunter.io/developer/1769335627) | [Jordan Stone](https://appshunter.io/developer/1823554814) |

## What reviewers say

### Vector Space AI

[App page](https://appshunter.io/ios/app/vector-space-ai/id6746352865)

This app offers a fast, private AI companion that runs locally on your device, providing instant responses for writing, brainstorming, and coding. It also allows seamless switching to cloud-based AI for more advanced queries.

**Highlights:** Runs locally on device, Optional ChatGPT API connection, Modern and clean interface, Instant response times, Complete user data privacy, Seamless mode switching

**Features:** Safari Extension

**In-app purchases:** none


### Arbiter

[App page](https://appshunter.io/ios/app/arbiter-local-ai-chat/id6747954532)

This privacy-focused AI assistant operates entirely on your device, offering offline functionality. Choose from various open-source models to suit your needs, with all conversations securely stored locally. It's ideal for brainstorming, proofreading, and exploring AI capabilities without data collection.

**Highlights:** On-device AI processing, Offline model execution, Document summarization, Privacy-focused design, Multiple AI model selection, Local data storage

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Large Tip | $9.99 | one-time |
| Extra Large Tip | $19.99 | one-time |


## Frequently asked questions

### Is Vector Space AI free?

Vector Space AI is free to download, with no in-app purchases.

### Is Arbiter free?

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

### Do Vector Space AI or Arbiter have ads?

Neither Vector Space AI nor Arbiter shows ads.

### Which is updated more often, Vector Space AI or Arbiter?

Vector Space AI ships an update every 4 days, and Arbiter fortnightly. Most recently, Vector Space AI was updated on October 8, 2026 and Arbiter on October 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.*