# SMART Keypad vs Dairy Ventilation

The clearest difference is update cadence: Dairy Ventilation at every 2 weeks against SMART Keypad's every 8 months. On price, ads, in-app purchases and monetization model there is nothing between them.

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

SMART Keypad ships an update every 8 months, Dairy Ventilation every 2 weeks. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | SMART Keypad | Dairy Ventilation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/dairy-ventilation/id6767579932/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 90 MB | 27 MB |
| Requires iOS | **14.2** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lenze SE](https://appshunter.io/developer/570667635) | [University of Wisconsin-Madison Shared Apps](https://appshunter.io/developer/908478605) |

## What reviewers say

### SMART Keypad

[App page](https://appshunter.io/ios/app/smart-keypad/id1292192378)

This application enables the diagnosis and configuration of a Lenze i500 inverter via a WLAN module. It offers features for connecting, diagnosing device status, performing basic commissioning, managing parameters, and controlling the inverter manually. Users can also transfer parameter sets and reset errors.

**Highlights:** Inverter diagnosis and parameterization, Device connection and search, Parameter list and management, Manual inverter control, Parameter set transfer, Error reset and device reset

**In-app purchases:** none


### Dairy Ventilation

[App page](https://appshunter.io/ios/app/dairy-ventilation/id6767579932)

This tool helps dairy producers make informed decisions about managing heat stress and mechanical ventilation in barns. It calculates key metrics like the Temperature-Humidity Index and fan efficiency, aiding in system design and upgrades.

**Highlights:** Temperature-Humidity Index (THI) calculation with location-based weather, Fan sizing and selection for barns, Assessment of existing ventilation performance, Fan efficiency comparison, Payback period analysis for upgrades

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SMART Keypad free?

SMART Keypad is free to download, with no in-app purchases.

### Is Dairy Ventilation free?

Dairy Ventilation is free to download, with no in-app purchases.

### Do SMART Keypad or Dairy Ventilation have ads?

Neither SMART Keypad nor Dairy Ventilation shows ads.

### Which is updated more often, SMART Keypad or Dairy Ventilation?

SMART Keypad ships an update every 8 months, and Dairy Ventilation every 2 weeks. Most recently, SMART Keypad was updated on October 7, 2026 and Dairy Ventilation on October 14, 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.*