Roofing Ventilation Calculator vs OC Now
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Roofing Ventilation Calculator
Calculate the necessary amount of ventilation products for an attic space. Input attic dimensions or square footage to receive results based on the NFA 1/300 rule for balanced ventilation.
- Attic dimension input
- Square footage input
- NFA 1/300 rule calculation
- Ventilation product quantity determination
- Balanced ventilation planning
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The Ventilation Calculator from CertainTeed is the ideal tool for quickly determining the amount of ventilation products needed to outfit an attic space with proper balanced ventilation. Simply enter the length and width of the attic space or the overall square footage of the space and the Ventilation Calculator produces results based upon the NFA 1/300 rule.
OC Now
Stay informed with instant company news and updates on your smartphone. Receive personalized notifications and share content with your team. This social platform keeps you connected to the latest stories and information.
- Instant company news updates
- Personalized notifications
- On-the-go stories
- Content sharing with team
- Like photos and videos
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OC Now is Owens Corning’s own mobile app and social media platform. Stay informed and connected with instant, on-the-go stories and information, all from your smartphone. Why you’ll love the OC Now app: Quick access to company news – stay up-to-date in just minutes! Personalized notifications and feeds with breaking news, reminders and notifications. Getting notifications for breaking news Share content with your team, “like” photos and videos, and more!
Screenshots
Verdict
The clearest difference is rating: OC Now at 3.3 against Roofing Ventilation Calculator's 3.0. Roofing Ventilation Calculator's advantage is update cadence (every 3 months vs every 9 months) and device support (3 vs 1). On price, ratings volume, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OC Now holds the better App Store score, 3.3 against 3.0. Both are backed by a comparable volume of ratings — 6 and 4 respectively.
Roofing Ventilation Calculator ships an update every 3 months, OC Now every 9 months. The most recent releases landed on June 19, 2026 and June 3, 2026 respectively.
| Parameter | Roofing Ventilation Calculator | OC Now |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (6 ratings) | 3.3 (4 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 6 — better | 4 |
| Update frequency | Every 3 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 34 MB | 113 MB |
| Age rating | 4+ | 4+ |
| Developer | Compagnie de Saint-Gobain | Owens Corning Sales, LLC |
Customer experience
Roofing Ventilation Calculator
OC Now
In-app purchases
Roofing Ventilation Calculator
No in-app purchases
OC Now
No in-app purchases
Questions
Is Roofing Ventilation Calculator free?
Is OC Now free?
Which has better reviews, Roofing Ventilation Calculator or OC Now?
Do Roofing Ventilation Calculator or OC Now have ads?
Which is updated more often, Roofing Ventilation Calculator or OC Now?
Other comparisons
