Comparison

WolfSense Mobile 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

WolfSense Mobile

This application connects GrayWolf DirectSense® II probes to iOS devices, transforming them into real-time displays and data loggers. It supports up to six plug-and-play gas sensors for various indoor air quality, industrial hygiene, and HVAC applications. Users can store logs, view trend graphs, and add multimedia notes to data files.

Highlights
  • Real-time display
  • Data logging
  • Supports multiple gas sensors
  • Trend graphing
  • Multimedia note integration
  • Cloud data access
Features
Read full description

Connect your GrayWolf DirectSense® II probes to your Apple iOS devices! This app allows you to use your smartphone or tablet as a real-time display, data-logger and more. Customize your DSII probe with up to (6) plug and play gas sensors (plus %RH and ºC/ºF) for a variety of indoor air quality, green building, industrial hygiene, and HVAC applications. Choose from over 25 highly accurate, smart sensors including TVOCs (PID), Carbon Dioxide (NDIR), Formaldehyde and O3, CO, NO2, NH3, SO2, NO, Cl2, H2S, HCN, HCl, O2, H2 (electrochemical). Store “snapshot” logs during walk-throughs, or trend log over time at your specified interval. Simultaneously display multiple parameters or view trend graphs on your screen, even access GrayWolfLive data from the cloud. Take advantage of your feature-rich smartphone to add photos, videos, text and audio notes directly to data files for efficient, reliable documentation.

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

WolfSense Mobile4 screens
DOCS II4 screens

Verdict

The call

The clearest difference is update cadence: WolfSense Mobile at every 7 months against DOCS II's every 58 months. WolfSense Mobile also leads on ratings volume (3 vs 1) and iOS requirement (11.0 vs 15.0). On price, rating, ads and in-app purchases 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.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for WolfSense Mobile against 5.0 for DOCS II. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

UpkeepUpdate frequency

WolfSense Mobile ships an update every 7 months, DOCS II every 58 months. The most recent releases landed on September 21, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 6 level
WolfSense Mobile versus DOCS II: the parameters behind the verdict, then further details
ParameterWolfSense MobileDOCS II
PriceFreeFree
Rating5.0 (3 ratings)5.0 (1 ratings)
Number of ratings3 — better1
Update frequencyEvery 7 months — betterEvery 58 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size161 MB91 MB
Age rating4+4+
DeveloperGrayWolf Sensing Solutions, LLCVirtual Technology LLC

In-app purchases

None

WolfSense Mobile

No in-app purchases

None

DOCS II

No in-app purchases

Questions

Is WolfSense Mobile free?
WolfSense Mobile is free to download, with no in-app purchases.
Is DOCS II free?
DOCS II is free to download, with no in-app purchases.
Which has better reviews, WolfSense Mobile or DOCS II?
WolfSense Mobile and DOCS II are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.
Do WolfSense Mobile or DOCS II have ads?
Neither WolfSense Mobile nor DOCS II shows ads.
Which is updated more often, WolfSense Mobile or DOCS II?
WolfSense Mobile ships an update every 7 months, and DOCS II every 58 months. Most recently, WolfSense Mobile was updated on September 21, 2026 and DOCS II on October 2, 2026.

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