# OmniAI vs Kai

The clearest difference is in-app purchases: Kai at none against OmniAI's 3. Kai also leads on ads (none vs shown) and update cadence (every 3 days vs monthly). On price, rating and ratings volume there is nothing between them.

Both are free to download. OmniAI sells 3 in-app purchases, starting at $3.99 per 7 days. Kai asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for OmniAI against 5.0 for Kai. Both are backed by a comparable volume of ratings — 10 and 4 respectively.

OmniAI ships an update monthly, Kai every 3 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | OmniAI | Kai |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (10 ratings)](https://appshunter.io/ios/app/omniai-ai-chat-assistant/id6756974545/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/kai-ai/id6758148023/reviews)** |
| Number of ratings | **10** | 4 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 27 MB | 127 MB |
| Requires iOS | 17.0 | **15.3** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Apptora LLC](https://appshunter.io/developer/1863970543) | [Simon Schubert](https://appshunter.io/developer/1219649975) |

## What reviewers say

### OmniAI

[App page](https://appshunter.io/ios/app/omniai-ai-chat-assistant/id6756974545)

Access multiple leading AI models like GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro in one app. Compare responses, switch models instantly, and utilize a clean interface for enhanced productivity in writing, research, coding, and more.

**Highlights:** Access multiple leading AI models, Compare AI responses, Seamless model switching, Clean and focused interface, Supports writing, research, coding, and more, Unlimited access via subscription

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $3.99 | per 7 days |
| Premium Weekly (free trial) | $3.99 | per 7 days |
| Premium Yearly | $49.99 | per year |


### Kai

[App page](https://appshunter.io/ios/app/kai-ai/id6758148023)

This open-source AI companion offers fast, simple, and private chat experiences powered by models like Llama and Gemini. It's designed for quick answers, brainstorming, writing, and learning with a minimalist interface.

**Highlights:** Blazing fast AI responses, Minimalist and intuitive interface, Open-source and transparent code, Choice of AI models (Llama, Gemini), Context-aware multi-turn conversations, Privacy-focused, no user tracking

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

**In-app purchases:** none


## Frequently asked questions

### Is OmniAI free?

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

### Is Kai free?

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

### Which has better reviews, OmniAI or Kai?

Kai is rated higher. OmniAI averages 4.9 out of 5 from 10 ratings, while Kai averages 5.0 from 4 ratings.

### Do OmniAI or Kai have ads?

OmniAI shows ads; Kai does not.

### Which is updated more often, OmniAI or Kai?

OmniAI ships an update monthly, and Kai every 3 days. Most recently, OmniAI was updated on October 28, 2026 and Kai 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.*