# ERIS vs STP

The clearest difference is update cadence: STP at every 9 days against ERIS's every 5 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ERIS ships an update every 5 weeks, STP every 9 days. The most recent releases landed on September 9, 2026 and August 13, 2026 respectively.

## The numbers

| Metric | ERIS | STP |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 9 days** |
| Monetization | Free | — |
| Size | 39 MB | 44 MB |
| Requires iOS | 13.4 | 13.4 |
| 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) | [Tai Le](https://appshunter.io/developer/525189214) |

## 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


### STP

[App page](https://appshunter.io/ios/app/stp/id6502858183)

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

**In-app purchases:** none


## Frequently asked questions

### Is ERIS free?

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

### Is STP free?

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

### Do ERIS or STP have ads?

Neither ERIS nor STP shows ads.

### Which is updated more often, ERIS or STP?

ERIS ships an update every 5 weeks, and STP every 9 days. Most recently, ERIS was updated on September 9, 2026 and STP on August 13, 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.*