# Ennos vs Watt

The clearest difference is update cadence: Watt at every 4 days against Ennos's monthly. Watt also leads on iOS requirement (15.0 vs 17.0). 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.

Ennos ships an update monthly, Watt every 4 days. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Ennos | Watt |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 6 MB | 64 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ennos Ag](https://appshunter.io/developer/1828445858) | [Abdulrasool Al-Hilo](https://appshunter.io/developer/6820459641) |

## What reviewers say

### Ennos

[App page](https://appshunter.io/ios/app/ennos/id6749009347)

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

**In-app purchases:** none


### Watt

[App page](https://appshunter.io/ios/app/watt-solar-system-calculator/id6820459639)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ennos free?

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

### Is Watt free?

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

### Do Ennos or Watt have ads?

Neither Ennos nor Watt shows ads.

### Which is updated more often, Ennos or Watt?

Ennos ships an update monthly, and Watt every 4 days. Most recently, Ennos was updated on October 30, 2026 and Watt on October 24, 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.*