# Virtual Ringelmann vs Quasar ST

Virtual Ringelmann and Quasar ST are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Virtual Ringelmann ships an update monthly, Quasar ST every 6 weeks. The most recent releases landed on September 10, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Virtual Ringelmann | Quasar ST |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | Free | — |
| Size | 73 MB | 59 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ACT Sistemas LTDA](https://appshunter.io/developer/1569392578) | [QUASAR SOLUCOES EM TRANSPORTES LTDA](https://appshunter.io/developer/1469842794) |

## What reviewers say

### Virtual Ringelmann

[App page](https://appshunter.io/ios/app/virtual-ringelmann/id1569392576)

This app aids in black smoke inspections by virtualizing the Ringelmann Scale methodology through your device's camera. It streamlines the process for assessing emissions from diesel engines and industrial chimneys, supporting environmental compliance and decision-making.

**Highlights:** Virtual Ringelmann Scale measurement, Supports vehicular and stationary surveillance, Automatic pollution index identification, Generates photographic evidence, Web portal integration for reports, Historical data logging

**Features:** macOS Compatibility

**In-app purchases:** none


### Quasar ST

[App page](https://appshunter.io/ios/app/quasar-st/id6747052875)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Virtual Ringelmann free?

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

### Is Quasar ST free?

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

### Do Virtual Ringelmann or Quasar ST have ads?

Neither Virtual Ringelmann nor Quasar ST shows ads.

### Which is updated more often, Virtual Ringelmann or Quasar ST?

Virtual Ringelmann ships an update monthly, and Quasar ST every 6 weeks. Most recently, Virtual Ringelmann was updated on September 10, 2026 and Quasar ST on September 14, 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.*