# ERMIS vs Open Agent

The clearest difference is iOS requirement: ERMIS at 17.0 against Open Agent's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. ERMIS sells 2 in-app purchases, starting at $19.99 per month and Open Agent sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ERMIS ships an update every 5 days, Open Agent every 9 days. The most recent releases landed on October 20, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | ERMIS | Open Agent |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/ermis-client-for-hermes/id6759341434/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 9 days |
| Monetization | Free with in-app purchases | — |
| Size | 15 MB | 101 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [Ilya Vishneuski](https://appshunter.io/developer/1878175811) | [Hoang Nguyen Vu](https://appshunter.io/developer/1883922584) |

## What reviewers say

### ERMIS

[App page](https://appshunter.io/ios/app/ermis-client-for-hermes/id6759341434)

This app provides a mobile interface to control your self-hosted AI agent. Manage complex workflows, research topics, draft content, and solve coding problems remotely. Your data remains on your instance for enhanced privacy and control.

**Highlights:** Connect to your Hermes Agent instance, Research topics and summarize, Write, edit, and generate content, Assist with coding and debugging, Plan tasks and organize workflows, Remote agent management

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $19.99 | per month |
| Premium | $199.99 | per year |


### Open Agent

[App page](https://appshunter.io/ios/app/open-agent/id6760329760)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OpenAgent Pro Weekly | $4.99 | per 7 days |
| OpenAgent Pro Yearly | $99.99 | per year |


## Frequently asked questions

### Is ERMIS free?

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

### Is Open Agent free?

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

### Do ERMIS or Open Agent have ads?

Neither ERMIS nor Open Agent shows ads.

### Which is updated more often, ERMIS or Open Agent?

ERMIS ships an update every 5 days, and Open Agent every 9 days. Most recently, ERMIS was updated on October 20, 2026 and Open Agent on October 1, 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.*