Sirrus vs Dairy Ventilation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sirrus
This app helps farmers and agronomists manage field data, scout crops, and make informed decisions. It allows for offline data collection, sharing recommendations, and generating reports. Premium features offer advanced editing and product information access.
- Offline field data collection
- Crop scouting and observation recording
- Create and share recommendations
- Generate PDF reports
- Soil sampling tools
- Export data as shapefile
- Hourly rainfall estimates
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Sirrus helps agronomists and farmers collaborate on farming decisions by making field data accessible and easy to collect. By connecting to the agX Platform, standardized field data is available offline and can be shared with other users and applications. Features: * Scout crops for pest pressures and easily record and collect observation photos * Create and share recommendation from the field * Generate PDF reports and share via email or text * Soil sample using a grid, zones, or previous soil sampling points * View fertilizer and nutrient recommendations * Send recommendations wirelessly using Raven Slingshot® * Export data as a shapefile * Receive rainfall estimates updated to the hour for each field * Drive or draw new field boundaries * Store and share data securely via the agX Platform ACCOMPLISH EVEN MORE WITH SIRRUS PREMIUM! Sirrus Premium unlocks advanced features: * Advanced Fertilizer Recommendation Editor – Edit variable rate recommendations by total product or cost * Product Labels/SDS – View up to date product information, labels, SDS and store for offline use * Variety Tech Sheets – View and share variety traits/information and store for offline use * Premium Reports – Beautiful PDF reports that cover your Scouting and Recommendation communication needs * Recents Search – A tool to increase efficiency in recommendation creation by sourcing previous activities * $49.99 Monthly, $499.99 Annually *Continued use of GPS running in the background can dramatically decrease battery life. *Sirrus Premium subscription prices may vary by location. Subscriptions will be charged to your credit card through your iTunes account. Your subscriptions will automatically renew unless canceled at least 24 hours before the end of the current period. Subscriptions may be managed and auto-renewal may be turned off by going to Account Settings after purchase. Privacy Policy: https://www.reedbusiness.com/privacy-policy/
Dairy Ventilation
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.
- 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
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Welcome to the Dairy Ventilation Calculator- a free UW-Madison Extension tool for dairy producers to support decisions about heat stress management and mechanical ventilation in dairy barns. FEATURES - THI (Temperature-Humidity Index) with location-based weather - Adopting Fans calculator — size and select fans for your barn - Evaluating Ventilation calculator — assess existing ventilation performance - Fan Efficiency comparison chart — compare fan models side by side - Payback Period analysis — estimate return on investment for upgrades WHO IT'S FOR - Dairy producers managing heat stress in cow housing - Farm managers planning fan upgrades or new ventilation systems - Extension educators and dairy consultants ABOUT Developed by Nesli Akdeniz in Biological Systems Engineering at UW-Madison as an educational and decision-support tool for dairy producers. Calculations follow established methods used in dairy ventilation design. Results are intended to give general guidance. Final decisions and outcomes remain the responsibility of the user.
Screenshots
Verdict
The clearest difference is rating: Dairy Ventilation at 5.0 against Sirrus's 3.5. Dairy Ventilation also leads on in-app purchases (none vs 2) and update cadence (every 2 weeks vs every 2 months). Sirrus's advantage is ratings volume (43 vs 4). On price, ads, device support 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
Both are free to download. Sirrus sells 2 in-app purchases, starting at $62.00 per month. Dairy Ventilation asks for nothing beyond the download.
Dairy Ventilation holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Sirrus has 43 ratings behind it against 4, so its average is the more settled of the two.
Sirrus ships an update every 2 months, Dairy Ventilation every 2 weeks. The most recent releases landed on October 23, 2026 and October 14, 2026 respectively.
| Parameter | Sirrus | Dairy Ventilation |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (43 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 43.8% of reviews | — |
| Number of ratings | 43 — better | 4 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 115 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Telus Ag and Consumer Goods | University of Wisconsin-Madison Shared Apps |
Customer experience
Sirrus
Dairy Ventilation
In-app purchases
Sirrus
- Sirrus Premium$62.001 Month
- Sirrus Premium$749.991 Year
Dairy Ventilation
No in-app purchases









