# Energy Efficiency Suite vs Viscosity Conversion

The clearest difference is price: Viscosity Conversion at $2.99 against Energy Efficiency Suite's $19.99. Energy Efficiency Suite's advantage is update cadence (every 3 months vs every 30 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Energy Efficiency Suite costs $19.99 and Viscosity Conversion $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Energy Efficiency Suite ships an update every 3 months, Viscosity Conversion every 30 months. The most recent releases landed on May 16, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Energy Efficiency Suite | Viscosity Conversion |
| --- | --- | --- |
| Price | $19.99 | **$2.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 30 months |
| Size | 4 MB | 1 MB |
| Requires iOS | 14.3 | **13** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Muralidhar Shenoy](https://appshunter.io/developer/460148822) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### Energy Efficiency Suite

[App page](https://appshunter.io/ios/app/energy-efficiency-suite/id506662296)

**Features:** macOS Compatibility

**In-app purchases:** none


### Viscosity Conversion

[App page](https://appshunter.io/ios/app/viscosity-conversion/id630288155)

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

**In-app purchases:** none


## Frequently asked questions

### Is Energy Efficiency Suite free?

Energy Efficiency Suite costs $19.99, with no in-app purchases.

### Is Viscosity Conversion free?

Viscosity Conversion costs $2.99, with no in-app purchases.

### Do Energy Efficiency Suite or Viscosity Conversion have ads?

Neither Energy Efficiency Suite nor Viscosity Conversion shows ads.

### Which is updated more often, Energy Efficiency Suite or Viscosity Conversion?

Energy Efficiency Suite ships an update every 3 months, and Viscosity Conversion every 30 months. Most recently, Energy Efficiency Suite was updated on May 16, 2026 and Viscosity Conversion on September 23, 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.*