# STRegulator vs Ethanol Calculator

The clearest difference is price: STRegulator at Free against Ethanol Calculator's $9.99. STRegulator also leads on iOS requirement (9.0 vs 16.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

STRegulator is free to download; Ethanol Calculator costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

STRegulator ships an update every 2 weeks, Ethanol Calculator every 9 days. The most recent releases landed on October 5, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | STRegulator | Ethanol Calculator |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Size | 44 MB | 10 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [良 李](https://appshunter.io/developer/1205166164) | [MOSTUNED LTD](https://appshunter.io/developer/6814598013) |

## What reviewers say

### STRegulator

[App page](https://appshunter.io/ios/app/stregulator/id1459832952)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ethanol Calculator

[App page](https://appshunter.io/ios/app/ethanol-calculator-e85-fuel/id6757930343)

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

**In-app purchases:** none


## Frequently asked questions

### Is STRegulator free?

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

### Is Ethanol Calculator free?

Ethanol Calculator costs $9.99, with no in-app purchases.

### Do STRegulator or Ethanol Calculator have ads?

Neither STRegulator nor Ethanol Calculator shows ads.

### Which is updated more often, STRegulator or Ethanol Calculator?

STRegulator ships an update every 2 weeks, and Ethanol Calculator every 9 days. Most recently, STRegulator was updated on October 5, 2026 and Ethanol Calculator 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.*