Windmill Air vs Engine Displacement Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Windmill Air
This app allows you to remotely control your smart air care devices. Set schedules and adjust settings to create your ideal home climate from anywhere.
- Remote product control
- Set automation schedules
- Adjust any setting
- Create ideal home climate
- Eco-friendly product integration
Read full descriptionHide full description
Windmill's air care products are modern, smart, and eco-friendly. Use the Windmill Air app to: 1. Control your products from anywhere! For example, turn on your Windmill AC before you get home, or shut it off in case you forget. 2. Set automation schedules to perfectly match your lifestyle. 3. Adjust any setting with ease, helping you create the ideal home climate!
Engine Displacement Calc
Read full descriptionHide full description
Need to know the exact displacement of an engine build before ordering parts? Whether you are verifying a crate motor, sizing a swap, or checking class compliance, this app calculates total engine displacement from bore, stroke, and cylinder count in seconds. Supports metric (mm) and imperial (inches). Shows total volume in cc, liters, and cubic inches. Includes bore/stroke ratio analysis with square, oversquare, and undersquare classification. FEATURES: - Enter bore diameter, stroke length, and number of cylinders - Instant per-cylinder and total displacement - Output in cc, liters, and cubic inches simultaneously - Bore/stroke ratio with automatic classification - Metric and imperial unit toggle - Works completely offline Perfect for engine builders, mechanics, race teams, and automotive enthusiasts who need accurate displacement figures on the spot.
Screenshots
Verdict
The clearest difference is price: Windmill Air at Free against Engine Displacement Calc's $4.99. On update cadence, ads, in-app purchases 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
Windmill Air is free to download; Engine Displacement Calc costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Windmill Air ships an update every 2 months, Engine Displacement Calc every 6 weeks. The most recent releases landed on October 22, 2026 and October 18, 2026 respectively.
| Parameter | Windmill Air | Engine Displacement Calc |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.7 (6.2K ratings) — better | — |
| Positive reviews | 27.9% of reviews | — |
| Number of ratings | 6.2K — better | — |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 83 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | The Air Lab, Inc. | Shanghai Sheyuan Network Technology Co., Ltd. |
Bugs and requests
Windmill Air
Reported bugs
4 issues- App unable to maintain accurate room temperature readings
- Automations not working as expected or reverting settings
- Connectivity issues causing the app to lose control of the unit
- Inconsistent behavior when turning the unit on/off or changing settings
Requested features
4 requests- Integration with smart home platforms
- Improved automation and scheduling capabilities
- More granular temperature and fan speed controls
- Ability to disable annoying app notifications
Engine Displacement Calc
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Windmill Air
No in-app purchases
Engine Displacement Calc
No in-app purchases
Questions
Is Windmill Air free?
Is Engine Displacement Calc free?
Do Windmill Air or Engine Displacement Calc have ads?
Which is updated more often, Windmill Air or Engine Displacement Calc?
Other comparisons
