# ERIS vs AI Assistant

The clearest difference is in-app purchases: ERIS at none against AI Assistant's 3. AI Assistant's advantage is update cadence (weekly vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. AI Assistant sells 3 in-app purchases, starting at $1.99 per 7 days. ERIS asks for nothing beyond the download.

ERIS ships an update every 5 weeks, AI Assistant weekly. The most recent releases landed on September 9, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | ERIS | AI Assistant |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 39 MB | 73 MB |
| Requires iOS | 13.4 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Bach Khoa Investment & Development of Solar Energy Corporation](https://appshunter.io/developer/1131639223) | [DECODATION](https://appshunter.io/developer/1677960582) |

## What reviewers say

### ERIS

[App page](https://appshunter.io/ios/app/eris/id1605516994)

Monitor and manage local green energy sources and projects. Control inverter power, track energy generation, and view savings from CO2 emissions and electricity prices. Receive real-time alerts for system anomalies.

**Highlights:** Manage and monitor all projects, Control inverter power, Track energy generation and savings, View CO2 emissions reduction, Real-time system anomaly alerts

**Features:** macOS Compatibility

**In-app purchases:** none


### AI Assistant

[App page](https://appshunter.io/ios/app/ai-assistant-chatbot-answer/id6472496933)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI ChatBot - 1 Week | $1.99 | per 7 days |
| AI ChatBot - 1 Month | $3.99 | per month |
| AI ChatBot 1 Year | $12.99 | per year |


## Frequently asked questions

### Is ERIS free?

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

### Is AI Assistant free?

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

### Do ERIS or AI Assistant have ads?

Neither ERIS nor AI Assistant shows ads.

### Which is updated more often, ERIS or AI Assistant?

ERIS ships an update every 5 weeks, and AI Assistant weekly. Most recently, ERIS was updated on September 9, 2026 and AI Assistant on September 21, 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.*