Comparison

DVR 17 vs DOCS II

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DVR 17

Features
Read full description

DVR17 is a H.264 digital video recorder remote viewer for UOI-DVR. 01. Address Book. 02. PTZ Control. 03. Relay Control. 04. Multi Channel H.264 Viewer. 05. Double tap to switch single channel mode/quad channel mode. 06. Scroll left/right to switch next/previous channel. 07. Listen DVR Audio. 08. Talk to DVR. 09. Remote Playback. 10. Event Notification. 11. Snapshot. 12. Zoom video.

About

DOCS II

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
Read full description

DOCS II is developed by Virtual Technology, LLC, located in Rio Rico, Arizona. Air Quality has been driven by Opacity Emission standards since the 1800s, with Opacity percentages used to determine airflow requirements for various coal-fired boilers. Every locality in the USA has a standing Visible Emission Opacity limit of no more than 40% Opacity over any six minutes. Visible Emission Standards lowering this opacity limit to 20% / 5% / Zero are not uncommon in the USA, with enforcement of air pollution regulations at the federal, state, and local levels. Failure to adhere to these regulations is very costly, as violations of opacity limits can result in fines of $25,000 per source per day. The most common methods to monitor opacity levels are EPA Method 9, EPA Alternative Method 082, ASTM D7520-16, Digital Camera Opacity Technique, using EPA Method 22. The methods are a visible emission indicator of smoke or no smoke, followed by a Visible Emission Observation (VEO) to determine Opacity. A Visible Emissions Manager completely automates the entire capture of information needed for a Visible Emission Observation. Using Google Maps, compass, inclinometers, distance calculations, online weather, and sun angle data, the VEO is documented with populated data. With the local data captured, the VEO is uploaded to the Virtual Technology LLC servers, and a completed VEO report is generated to create the compliance archive. Nuisance ‘visible’ emissions accounted for over 85% of Air Quality complaints until today are still monitored exclusively by the highly subjective human observation method 9. Visible Emissions Manager is the solution for measuring Opacity and managing complaints of Nuisance Visible Emissions and regulated sources.

Screenshots

DVR 173 screens
DOCS II4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences · 7 level
DVR 17 versus DOCS II: the parameters behind the verdict, then further details
ParameterDVR 17DOCS II
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 2 months — betterEvery 58 months
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better15.0
Further details — not scored
Size8 MB91 MB
Age rating4+4+
DeveloperAquila DVRVirtual Technology LLC

In-app purchases

None

DVR 17

No in-app purchases

None

DOCS II

No in-app purchases

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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