Duux vs Ceryn
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Duux
Control and monitor your smart air treatment devices from anywhere. Schedule operations, adjust settings, and ensure optimal air quality for a healthier living environment. Experience a smarter, more connected home.
- Real-time device monitoring
- Easy scheduling of operations
- Remote control from anywhere
- Intuitive user interface
- Manage air treatment devices
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Welcome to the future of air treatment with Duux Smart, your ultimate companion for creating a comfortable and healthy living environment. Our app is designed to bring convenience and innovation right to your fingertips, allowing you to seamlessly connect and manage your Duux devices. With Duux Smart, you have the power to monitor your devices in real-time, ensuring optimal air quality and device performance at all times. The app's intuitive design allows for easy scheduling of operations, matching your lifestyle and ensuring your home is always welcoming. Remote control capabilities mean you can adjust settings, switch modes, and manage your devices from anywhere, offering both convenience and peace of mind. Our user-friendly interface makes controlling sophisticated air treatment simple, making it accessible to everyone. Why choose Duux Smart? It's not just about controlling your devices; it's about enhancing your living space and promoting a healthier, happier home. Download Duux Smart now and transform your approach to air treatment. Breathe easy and enjoy a smarter, more connected home.
Ceryn
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We make decisions every day. Most are forgotten. Ceryn helps you capture important choices, revisit them later, and understand how your thinking evolves over time. Record decisions in the moment. Reflect on what actually happened. Notice patterns in confidence, judgment, and outcomes. Powered by the new CPD Intelligence Engine, Ceryn helps surface recurring patterns, reflection signals, and cognitive trends across your decisions. Private iCloud Sync keeps your reflections available across iPhone, Apple Watch, iPad, and Apple TV — using the private iCloud account already connected to your Apple devices. Designed to feel calm, focused, and distraction-free. Features: • Quick decision capture • Confidence and reflection tracking • Outcome reviews • Decision timeline • CPD pattern insights • Apple Watch support • Home screen widgets • Private iCloud Sync • Private by design No feeds. No noise. Just clearer thinking over time. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Duux at none against Ceryn's 2. Ceryn's advantage is update cadence (every 2 days vs monthly). 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. Ceryn sells 2 in-app purchases, starting at $1.99 per month. Duux asks for nothing beyond the download.
Duux ships an update monthly, Ceryn every 2 days. The most recent releases landed on September 30, 2026 and October 2, 2026 respectively.
| Parameter | Duux | Ceryn |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (15 ratings) — better | — |
| Positive reviews | 29.4% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Monthly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.1 — better | 16.6 |
| Further details — not scored | ||
| Size | 122 MB | 58 MB |
| Age rating | 4+ | 4+ |
| Developer | Duux B.V. | Leliveld Holding BV |
Bugs and requests
Duux
Reported bugs
5 issues- App frequently loses connection with device
- App unable to find or add device
- App UI and functionality regressed with updates
- Devices randomly disconnecting from WiFi
- App login/registration issues
Requested features
5 requests- Add ability to edit schedules
- Implement away mode or low temperature setting
- Allow rearranging of rooms in app
- Add more scheduling options and flexibility
- Improve Alexa/Google Home integration
Ceryn
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Duux
No in-app purchases
Ceryn
- Ceryn Intelligence7 Days trial$1.991 Month
- Ceryn Intelligence$19.991 Year
