Comparison

Milking Prep Lag Timer vs HMI Viewer

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

Head to head
About

Milking Prep Lag Timer

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The app uses a push button interface to track the timing of the various stages of the milking procedure, with the flexibility to choose the stages and number of cows to time. The user specifies which pen and how many cows are in the preparation sequence. In additon, a turn timer is provided in the upper right hand corner of the view. When the app is initiated, you may identify the herd and scorer name in the appropriate text fields. Next, you must setup the routine. First enter the pen number by touching inside the Pen textbox, touch/type the desired identification then touch Done. Next enter the Number of Cows in the Preparation Sequence – for spatial prep sequences, this is the number of cows a milker prepares before starting the prep sequence again on another group of cows. Enter the Number of Cows Timed by touching the textbox. A selector will open, touch the desired number (1-8) and touch Done. Novice evaluators will want to start with 2 or 3 cows, while more experienced operators may choose up to 8 cows. Note, number of cows timed does not have to equal number of cows in the prep sequence. You may sample any cow or cows in the prep sequence; eg. the first cow, the middle cow, the end cow, etc. Next, the user will select the milking preparation steps. Touch inside the Step 1 textbox and select the preparation step using the selector. Touch Done to finalize selection. Repeat until all steps have been assigned. The setup up process is structural and must occur in this order. After all steps have been assigned and you are ready to begin timing, touch the Activate timing buttons button. The first row of timing buttons will become enabled with a white border and the other buttons will have a gray border until they become activated. When the procedure is initiated for each parlor position (cow), touch the button. Times will be recorded and the button for the next step will be enabled with a white border showing. If a button is touched inadvertently, press it again to negate or undo. The recently activated button will become inactive and the pressed button will return to a white border until repressed. When the whole sequence of cows is completed, all timing buttons will have a blue border. To score another sequence of cows, touch the Reset to Score again button. This action will automatically advance the Round to 2. If a new Pen is scored, the new pen number will reset the Round to 1. To clear all scores and return the app to its no data state, touch the Clear Data button. You will be promoted to ensure that this is what you want to do. To time parlor turns, identify the pen being timed and touch Start. Touch Stop when the parlor turn has finished. Touch Reset to prepare the timer for another turn. Touch Clear to remove all turn time measurements. The milking preparation steps are predefined. The list includes: Dry wipe Dip 1 Scrub-on Foremilk Dip 2 Wipe Scrup-off Attach Detach The parameters timed include: PrepLagTime – amount of time between the initiation of the preparation procedure and attachment of the milking machine, defined as Attach minus Step 1. DipContactTime – amount of time the teat dip is in contact with the teat surface, defined as Wipe minus Dip 1. For teat scrubbers, the dip contact time is defined as Scrub-off minus Scrub-on. AttachedTime – amount of time the milking machine is attached to the cow defined as Detach minus Attach. The user may view the timing summary by touching the View Summary button. This summary will provide summary of the above metrics for each cow timed for each round, with an average and SD for each pen, each position and for all rounds timed. To view the data collection in a tablular format, touch the View Data button. Rows of data will be displayed for each cow/position timed without summary information. The data or summary information may be emailed to create a permanent record.

About

HMI Viewer

This application allows end users to interact with PLC-controlled processes through custom-designed Human Machine Interfaces. Integrators can create and deploy these interfaces securely, enabling seamless control and monitoring of industrial systems.

Highlights
  • View-only HMI interface
  • Interact with PLC-controlled processes
  • Secure deployment to end-user devices
  • Supports major PLC brands
  • Native application performance
Features
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HMI is the view only version of our HMI system (HMI and HMI Editor). With the HMI Editor app integrators create efficient, advanced, highly responsive "Human Machine Interfaces" and deploy securely to end users's devices who are able to run projects specifically designed for them. As an end user you can download your projects with a single tap of your finger and interact with your Programmable Logic Controllers (PLCs) controlled processes as you never did before. The HMI Editor and HMI apps are fully native and support all major Programmable Logic Controller (PLC) brands.

Screenshots

HMI Viewer4 screens

Verdict

The call

The clearest difference is update cadence: HMI Viewer at every 2 months against Milking Prep Lag Timer's every 6 months. HMI Viewer also leads on price ($0.99 vs $2.99) and device support (4 vs 1). On ads, in-app purchases and iOS requirement 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

Milking Prep Lag Timer costs $2.99 and HMI Viewer $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Milking Prep Lag Timer ships an update every 6 months, HMI Viewer every 2 months. The most recent releases landed on September 19, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 6 level
Milking Prep Lag Timer versus HMI Viewer: the parameters behind the verdict, then further details
ParameterMilking Prep Lag TimerHMI Viewer
Price$2.99$0.99 — better
Rating—5.0 (4 ratings) — better
Number of ratings—4 — better
Update frequencyEvery 6 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPadiPhone, iPad, iPod, Mac — better
Requires iOS15.615.0 — better
Further details — not scored
Size6 MB17 MB
Age rating4+4+
DeveloperUniversity of Wisconsin - Madison School of Veterinary MedicineGreg Maendel

In-app purchases

None

Milking Prep Lag Timer

No in-app purchases

None

HMI Viewer

No in-app purchases

Questions

Is Milking Prep Lag Timer free?
Milking Prep Lag Timer costs $2.99, with no in-app purchases.
Is HMI Viewer free?
HMI Viewer costs $0.99, with no in-app purchases.
Do Milking Prep Lag Timer or HMI Viewer have ads?
Neither Milking Prep Lag Timer nor HMI Viewer shows ads.
Which is updated more often, Milking Prep Lag Timer or HMI Viewer?
Milking Prep Lag Timer ships an update every 6 months, and HMI Viewer every 2 months. Most recently, Milking Prep Lag Timer was updated on September 19, 2026 and HMI Viewer on October 24, 2026.

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