Comparison

Lynx Barcode 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

Lynx Barcode

Features
Read full description

Lynx Bar Code Reader is an application that can be used to read Toro Decoder bar code addresses for use with the Lynx Central Control System. Requires App Support Plan. Contact The Toro NSN.

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

Lynx Barcode3 screens
DOCS II4 screens

Verdict

The call

The clearest difference is update cadence: Lynx Barcode at every 6 months against DOCS II's every 58 months. Lynx Barcode also leads on iOS requirement (9.0 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

Lynx Barcode ships an update every 6 months, DOCS II every 58 months. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

Scorecard2 real differences · 7 level
Lynx Barcode versus DOCS II: the parameters behind the verdict, then further details
ParameterLynx BarcodeDOCS II
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 6 months — betterEvery 58 months
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better15.0
Further details — not scored
Size17 MB91 MB
Age rating4+4+
DeveloperThe Toro CompanyVirtual Technology LLC

In-app purchases

None

Lynx Barcode

No in-app purchases

None

DOCS II

No in-app purchases

Questions

Is Lynx Barcode free?
Lynx Barcode 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 Lynx Barcode or DOCS II have ads?
Neither Lynx Barcode nor DOCS II shows ads.
Which is updated more often, Lynx Barcode or DOCS II?
Lynx Barcode ships an update every 6 months, and DOCS II every 58 months. Most recently, Lynx Barcode was updated on October 7, 2026 and DOCS II on October 2, 2026.

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