# A2A Authenticator vs MCP Agent

The clearest difference is in-app purchases: A2A Authenticator at none against MCP Agent's 2. A2A Authenticator also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.6). On price and ads there is nothing between them.

Both are free to download. MCP Agent sells 2 in-app purchases, starting at $2.99 per 7 days. A2A Authenticator asks for nothing beyond the download.

## The numbers

| Metric | A2A Authenticator | MCP Agent |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Daily |
| Size | 27 MB | 22 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Jupiter System & Solution](https://appshunter.io/developer/1397216911) | [Elisaveta Kalmikova](https://appshunter.io/developer/1702744064) |

## What reviewers say

### A2A Authenticator

[App page](https://appshunter.io/ios/app/a2a-authenticator/id6744716942)

**Features:** macOS Compatibility

**In-app purchases:** none


### MCP Agent

[App page](https://appshunter.io/ios/app/mcp-agent-ai-task-assistant/id6748754739)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MCP Client Weekly Plan | $2.99 | per 7 days |
| MCP Client Yearly Access | $29.99 | per year |


## Frequently asked questions

### Is A2A Authenticator free?

A2A Authenticator is free to download, with no in-app purchases.

### Is MCP Agent free?

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

### Do A2A Authenticator or MCP Agent have ads?

Neither A2A Authenticator nor MCP Agent 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.*