# SIAECOSYS vs EWATT

The clearest difference is update cadence: SIAECOSYS at every 3 days against EWATT's every 2 months. SIAECOSYS also leads on iOS requirement (8.0 vs 13.0). 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.

SIAECOSYS ships an update every 3 days, EWATT every 2 months. The most recent releases landed on October 2, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | SIAECOSYS | EWATT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 months |
| Size | 3 MB | 24 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Teranovo](https://appshunter.io/developer/1250774924) | [帆 刘](https://appshunter.io/developer/1706245535) |

## What reviewers say

### SIAECOSYS

[App page](https://appshunter.io/ios/app/siaecosys/id1523245271)

**Features:** macOS Compatibility

**In-app purchases:** none


### EWATT

[App page](https://appshunter.io/ios/app/ewatt-bms/id6464585303)

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

**In-app purchases:** none


## Frequently asked questions

### Is SIAECOSYS free?

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

### Is EWATT free?

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

### Do SIAECOSYS or EWATT have ads?

Neither SIAECOSYS nor EWATT shows ads.

### Which is updated more often, SIAECOSYS or EWATT?

SIAECOSYS ships an update every 3 days, and EWATT every 2 months. Most recently, SIAECOSYS was updated on October 2, 2026 and EWATT on October 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*