# DVR 17 vs DOCS II

The clearest difference is update cadence: DVR 17 at every 2 months against DOCS II's every 58 months. DVR 17 also leads on iOS requirement (8.0 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.

DVR 17 ships an update every 2 months, DOCS II every 58 months. The most recent releases landed on September 22, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | DVR 17 | DOCS II |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/docs-ii/id1546600318/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 58 months |
| Monetization | — | Free |
| Size | 8 MB | 91 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aquila DVR](https://appshunter.io/developer/471295643) | [Virtual Technology LLC](https://appshunter.io/developer/1546600320) |

## What reviewers say

### DVR 17

[App page](https://appshunter.io/ios/app/dvr-17/id1048900973)

**Features:** macOS Compatibility

**In-app purchases:** none


### DOCS II

[App page](https://appshunter.io/ios/app/docs-ii/id1546600318)

This app automates the capture and reporting of visible emission observations for air quality compliance. It uses location data, weather, and sun angles to document opacity levels, helping users avoid costly fines. The tool generates compliance archives for regulated sources.

**Highlights:** Automated Visible Emission Observation (VEO) capture, Integration with Google Maps, compass, and inclinometers, Real-time weather and sun angle data, Opacity level documentation, Automated VEO report generation, Compliance archive creation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DVR 17 free?

DVR 17 is free to download, with no in-app purchases.

### Is DOCS II free?

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

### Do DVR 17 or DOCS II have ads?

Neither DVR 17 nor DOCS II shows ads.

### Which is updated more often, DVR 17 or DOCS II?

DVR 17 ships an update every 2 months, and DOCS II every 58 months. Most recently, DVR 17 was updated on September 22, 2026 and DOCS II on October 2, 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.*