# Chat API vs OMessage

The clearest difference is in-app purchases: OMessage at none against Chat API's 3. OMessage also leads on ads (none vs shown). Chat API's advantage is iOS requirement (14.0 vs 16.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Chat API sells 3 in-app purchases, starting at $1.99 per month. OMessage asks for nothing beyond the download.

Chat API ships an update weekly, OMessage every 5 days. The most recent releases landed on October 21, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Chat API | OMessage |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/chat-api-ai-wrapper/id6670289029/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 78 MB | 12 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Andres Nunez Soto](https://appshunter.io/developer/1748007663) | [寰宇 骆](https://appshunter.io/developer/1045601874) |

## What reviewers say

### Chat API

[App page](https://appshunter.io/ios/app/chat-api-ai-wrapper/id6670289029)

Access powerful AI models locally or through cloud APIs. This tool offers flexible integration with GPT-4, OpenAI, Grok, and local LLMs for diverse tasks like coding, drafting, and research.

**Highlights:** Private local LLM support with Ollama, OpenAI and Grok API integration, Built-in text-only GPT-4 model, Bing-powered real-time searches, Image generation capabilities, Seamless model switching

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Access (Monthly) | $1.99 | per month |
| Unlimited Access (Yearly) | $19.99 | per year |
| Pro Supporter Yearly | $49.99 | per year |


### OMessage

[App page](https://appshunter.io/ios/app/omessage-chat-with-local-ai/id6742433200)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chat API free?

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

### Is OMessage free?

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

### Do Chat API or OMessage have ads?

Chat API shows ads; OMessage does not.

### Which is updated more often, Chat API or OMessage?

Chat API ships an update weekly, and OMessage every 5 days. Most recently, Chat API was updated on October 21, 2026 and OMessage on October 18, 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.*