# Arbiter vs Omnithink

The clearest difference is in-app purchases: Omnithink at none against Arbiter's 4. Omnithink also leads on update cadence (weekly vs fortnightly) and iOS requirement (15.0 vs 18.4). Arbiter's advantage is ratings volume (16 vs 5). On price, rating, ads and monetization model there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.9 for Arbiter against 5.0 for Omnithink. Both are backed by a comparable volume of ratings — 16 and 5 respectively.

Arbiter ships an update fortnightly, Omnithink weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Arbiter | Omnithink |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (16 ratings)](https://appshunter.io/ios/app/arbiter-local-ai-chat/id6747954532/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/omnithink/id6760921753/reviews)** |
| Number of ratings | **16** | 5 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free | Free |
| Size | 40 MB | 13 MB |
| Requires iOS | 18.4 | **15.0** |
| Devices | iPhone, Mac | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Jordan Stone](https://appshunter.io/developer/1823554814) | [Benyamin Famili](https://appshunter.io/developer/1886828867) |

## What reviewers say

### 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 |


### Omnithink

[App page](https://appshunter.io/ios/app/omnithink/id6760921753)

This app sends your questions to multiple AI models simultaneously, then analyzes and synthesizes their responses. Get more reliable answers by comparing insights from leading AI like ChatGPT, Gemini, and Claude. Features statement analysis and customizable thinking modes for deeper understanding.

**Highlights:** Multi-model AI comparison, Consensus View of AI responses, Statement analysis for claim verification, Customizable Smart Answer Modes, Side-by-side response views, Export results to PDF, Markdown, Query history and search

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Arbiter free?

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

### Is Omnithink free?

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

### Which has better reviews, Arbiter or Omnithink?

Omnithink is rated higher. Arbiter averages 4.9 out of 5 from 16 ratings, while Omnithink averages 5.0 from 5 ratings.

### Do Arbiter or Omnithink have ads?

Neither Arbiter nor Omnithink shows ads.

### Which is updated more often, Arbiter or Omnithink?

Arbiter ships an update fortnightly, and Omnithink weekly. Most recently, Arbiter was updated on October 24, 2026 and Omnithink on October 24, 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.*