# Stratum 9 vs ERMIS

The clearest difference is rating: Stratum 9 at 5.0 against ERMIS's 4.0. Stratum 9 also leads on in-app purchases (none vs 2) and iOS requirement (13.4 vs 17.0). ERMIS's advantage is update cadence (every 5 days vs every 5 weeks). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. ERMIS sells 2 in-app purchases, starting at $19.99 per month. Stratum 9 asks for nothing beyond the download.

Stratum 9 holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

Stratum 9 ships an update every 5 weeks, ERMIS every 5 days. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Stratum 9 | ERMIS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stratum-9/id6478380143/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/ermis-client-for-hermes/id6759341434/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 15 MB |
| Requires iOS | **13.4** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [9th Stratum Publishing LLC](https://appshunter.io/developer/1732644918) | [Ilya Vishneuski](https://appshunter.io/developer/1878175811) |

## What reviewers say

### Stratum 9

[App page](https://appshunter.io/ios/app/stratum-9/id6478380143)

This app provides a science-backed framework for achieving and sustaining elite performance. It offers self-assessment tools, personalized development plans, practical strategies, and goal-setting tools to help users improve across all areas of life.

**Highlights:** Self-Assessment Tools, Customized Skill Development Plans, Performance Library (TacApps), DOIT Goal Strategy, Daily Challenges & Progress Tracking, Community and Peer Support

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Stratum 9 free?

Stratum 9 is free to download, with no in-app purchases.

### Is ERMIS free?

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

### Which has better reviews, Stratum 9 or ERMIS?

Stratum 9 is rated higher. Stratum 9 averages 5.0 out of 5 from 2 ratings, while ERMIS averages 4.0 from 4 ratings.

### Do Stratum 9 or ERMIS have ads?

Neither Stratum 9 nor ERMIS shows ads.

### Which is updated more often, Stratum 9 or ERMIS?

Stratum 9 ships an update every 5 weeks, and ERMIS every 5 days. Most recently, Stratum 9 was updated on October 24, 2026 and ERMIS on October 20, 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.*