Airthings vs Smell Annotator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Airthings
Monitor and improve your indoor air quality with smart devices. Get real-time insights, track trends, and receive actionable advice to enhance focus, reduce allergies, and sleep better. Control your air purifier and stay informed about pollen forecasts.
- Quick device setup
- At-a-glance air quality indicators
- Detailed trend tracking
- Air purifier remote control
- 5-day pollen forecast
- Air quality notifications
- Personalized air reports
Read full descriptionHide full description
Breathe better with Airthings! Smart air quality monitors & purifiers you can trust. Shift your state of being with Airthings. Our products can help you improve indoor air quality leading to better focus, calming of allergies, and enhancement of sleep while ensuring an overall more healthy home. It features: • Quick and easy device setup • AirGlimpse™: Color-coded indicators give you at-a-glance information about your air quality • Access to the detailed graphs to help you track and find trends over time • Set focuses for your devices - air quality data broken down into high engagement problems that you care about • Control your Renew air purifier from anywhere • 5-day pollen forecast for your location with actionable advice • Notifications inform you of poor air quality and suggest ways to improve it, fast • Tips for addressing common indoor air quality problems and how to make the most of your device • Recommendations on the best Airthings monitor for your needs • Subscribe to Air Reports - We’ll send you a monthly update which summarises all the sensor data for your location. This app supports all Airthings products. If you have questions about using the app or any of our monitors, please refer to the Airthings Help Center or contact support@airthings.com.
Smell Annotator
This application enables machines to digitally sense and analyze smells using nanomaterial-based technology. It allows users to view, annotate, and recognize smell measurements in real-time, functioning as part of a developer kit.
- Smell recognition
- Smell digitalization and annotation
- Saving and loading measurements
- Real-time measurement visualization
- Offline data collection
- Graph synchronization
Read full descriptionHide full description
Today, machines can see, hear, feel, and even learn. But smell? Not really! Our nanomaterial-based technology enables machines to use an electronic sense of smell. Smell Annotator app is an AI-based software program which is used to view, annotate and analyze smell measurements taken with the Smell Inspector and to recognize annotated smells in real time. The Smell Annotator app is a part of the Smell Inspector Developer Kit. The Smell Annotator gives you access to the smell sensors of your Smell Inspector developer kit. APP FEATURES * Smell recognition [NEW] * Smell digitalization and annotation * Saving measurements and loading saved data * Visualization of real-time and saved measurements with temperature and humidity data * Collect measurement data with or without internet access * Sync graphs for better clarity of data SENSORS * 4 Smell iX16 detector chips * Temperature sensor * Humidity sensor SMELL INSPECTOR The Smell Inspector is a ready-to-use device for anyone and a developer kit. It is suitable for testing and exploring different smell-related applications in the fields of product quality, safety & security, life & care, air quality, and many others. It has four Smell iX 16 detector chips inside, can be connected to a PC, tablet, or smartphone, and can be operated with Smell Annotator software. USER MANUAL For more information about how to use the App and the Smell Inspector device, go to: http://smart-nanotubes.com/downloads/ ABOUT US Along with a great community of industry experts and researchers, SmartNanotubes Technologies shares the vision of digital smell recognition. Our goal is to enable digital smell recognition in a fast and easy way and help our customers to develop product solutions for their own smell and gas detection applications. Visit us at: http://smart-nanotubes.com
Screenshots
Verdict
The clearest difference is rating: Airthings at 4.4 against Smell Annotator's 1.0. Airthings also leads on ratings volume (3K vs 1). Smell Annotator's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (15.0 vs 17.6). On price, update cadence, 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.
Airthings holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: Airthings has 3K ratings behind it against 1, so its average is the more settled of the two.
Airthings ships an update fortnightly, Smell Annotator monthly. The most recent releases landed on September 22, 2026 and September 14, 2026 respectively.
| Parameter | Airthings | Smell Annotator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (3K ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 3K — better | 1 |
| Update frequency | Fortnightly — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 102 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | Airthings ASA | SmartNanotubes Technologies |
Customer experience
Airthings
Smell Annotator
Bugs and requests
Airthings
Reported bugs
6 issues- App crashes frequently
- Unable to add new devices or accounts
- Incorrect color coding and data display
- Delayed or missing sensor data updates
- Bluetooth connectivity issues
Show 1 moreShow fewer
- Unexplained battery drain on devices
Requested features
6 requests- Add HomeKit integration
- Allow custom thresholds and notifications
- Improve data visualization and historical trending
- Add more detailed information on air quality issues and remedies
- Provide an iPad-optimized version of the app
Show 1 moreShow fewer
- Improve syncing and connectivity reliability
Smell Annotator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Airthings
No in-app purchases
Smell Annotator
No in-app purchases
Questions
Is Airthings free?
Is Smell Annotator free?
Which has better reviews, Airthings or Smell Annotator?
Do Airthings or Smell Annotator have ads?
Which is updated more often, Airthings or Smell Annotator?
Other comparisons















