Surface Area Calculator + Cost vs Smart Purifier
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Surface Area Calculator + Cost
Calculate the surface area of various 3D geometric shapes and get an estimated cost for materials. Supports multiple units for calculations and results.
- Surface area calculation for 11 shapes
- Material cost estimation
- Multiple unit support
- Results in various units
- Subscription for unlimited access
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Our app helps you to calculate the surface area of several common shapes. This tool also provides a cost of materials estimate. We offer a diverse set of units suitable for almost every country. The results of each calculation are also expressed in many units of different area. We support you with a variety of different types: - Cone - Cube - Sphere - Pyramid - Cylinder - Octahedron - Rectangular - Truncated cone - Triangular Prism - Hexagonal Prism - Triangular Pyramid - Hemispherical Shape SUBSCRIPTION INFORMATION This subscription package offers users unlimited access to all app features throughout the subscription period. • Payment will be charged to iTunes Account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. • Account will be charged for renewal within 24 hours prior to the end of the current period, and identify the cost of the renewal. • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: https://13520178.github.io/SurfaceAreaCalc/policy.html Terms of Use: https://13520178.github.io/SurfaceAreaCalc/terms.html We are happy to serve! If you have any requests or suggestions, do not hesitate to contact us. Email: phannhatd@gmail.com
Smart Purifier
Monitor and control your Smart Purifier air quality device. View real-time air quality data and adjust settings remotely. Ensure a healthy living environment with this connected appliance management tool.
- Remote device control
- Real-time air quality monitoring
- Device settings adjustment
- Air purification management
- Connected appliance integration
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Ứng dụng giám sát và điều khiển thiết bị Smart Purifier (Thiết bị máy lọc không khí cấp khí tươi Viettel) - sản phẩm của Trung tâm Nghiên cứu thiết bị Y Tế - Tổng công ty Công nghiệp công nghệ cao Viettel (VHT) - Viettel Group
Screenshots
Verdict
The clearest difference is rating: Surface Area Calculator + Cost at 3.5 against Smart Purifier's 1.0. Surface Area Calculator + Cost also leads on review sentiment (22% vs 0%) and ratings volume (24 vs 2). Smart Purifier's advantage is in-app purchases (none vs 3) and update cadence (fortnightly vs every 6 months). On price, ads 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
Both are free to download. Surface Area Calculator + Cost sells 3 in-app purchases, starting at $1.99 per month. Smart Purifier asks for nothing beyond the download.
Surface Area Calculator + Cost holds the better App Store score, 3.5 against 1.0. That said, the two scores are not equally well evidenced: Surface Area Calculator + Cost has 24 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 22% of Surface Area Calculator + Cost's written reviews are positive against 0% of Smart Purifier's.
Surface Area Calculator + Cost ships an update every 6 months, Smart Purifier fortnightly. The most recent releases landed on October 1, 2026 and October 24, 2026 respectively.
| Parameter | Surface Area Calculator + Cost | Smart Purifier |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (24 ratings) — better | 1.0 (2 ratings) |
| Positive reviews | 22.2% of reviews — better | 0.0% of reviews |
| Number of ratings | 24 — better | 2 |
| Update frequency | Every 6 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 115 MB |
| Age rating | 4+ | 4+ |
| Developer | Phan Nhat Đang | VIETTEL GROUP |
Customer experience
Surface Area Calculator + Cost
Smart Purifier
In-app purchases
Surface Area Calculator + Cost
- Premium monthly package$1.991 Month
- Annual Premium Package$14.991 Year
- Remove ads$19.99
Smart Purifier
No in-app purchases
Questions
Is Surface Area Calculator + Cost free?
Is Smart Purifier free?
Which has better reviews, Surface Area Calculator + Cost or Smart Purifier?
Do Surface Area Calculator + Cost or Smart Purifier have ads?
Which is updated more often, Surface Area Calculator + Cost or Smart Purifier?
Other comparisons
