# Virtual Ringelmann vs SST

The clearest difference is update cadence: Virtual Ringelmann at monthly against SST's every 4 months. SST's advantage is iOS requirement (11.0 vs 15.0). 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.

Virtual Ringelmann ships an update monthly, SST every 4 months. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Virtual Ringelmann | SST |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 4 months |
| Monetization | Free | — |
| Size | 73 MB | 50 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ACT Sistemas LTDA](https://appshunter.io/developer/1569392578) | [Daniel Francisco](https://appshunter.io/developer/1682665127) |

## 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


### SST

[App page](https://appshunter.io/ios/app/sst-central-nr-nho-e-ca/id6447785586)

**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 SST free?

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

### Do Virtual Ringelmann or SST have ads?

Neither Virtual Ringelmann nor SST shows ads.

### Which is updated more often, Virtual Ringelmann or SST?

Virtual Ringelmann ships an update monthly, and SST every 4 months. Most recently, Virtual Ringelmann was updated on October 15, 2026 and SST on October 17, 2026.

---

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