Mould gas detection.
Looks for gas patterns associated with mould, alongside VTT-based growth modelling.
See how it works ↗
Two modes.
One VEX.
24/7 room monitoring.
Leave VEX in place to track the air, temperature and humidity over time.
Spot check.
Sample the air near damp corners, wardrobes or other areas of concern.
VEX 0.6 · In development
Leak detection included.
Our leak-detection software uses temperature and humidity patterns to flag potential leaks.
Explore the demo ↗Know what happens next.
Connect alerts to inspections, evidence, resident updates and repairs in Ofacto.
Explore the platform ↗Connectivity & power
Choose NB-IoT, LoRaWAN, Wi-Fi or Bluetooth. Mains power supports continuous room monitoring.
More than a humidity reading.
One home · 90-day example
Everyday living
Dinner. A shower. Life at home.
A brief rise in humidity settles. A humid moment doesn’t mean mould is growing.
VEX prediction Mould risk
VTT on its ownModels the conditions for growth.
A short humid spell adds little to the accumulated growth estimate.
VEX · VTT includedAdds context from the air.
Combines conditions with gas patterns. This brief event settles without a mould-risk alert.
What happens nextKeep monitoring.
Explore the readings & model
VEX uses VTT mould-growth modelling alongside gas-pattern analysis and leak-detection software. High humidity favours growth; it does not prove mould is present.
Temperature
Humidity
VTT growth estimate
Generated hourly readings. The VTT calculation uses the Finnish mould growth model: sensitive material, initial index 0, decline factor 0.25. Room air is a proxy for surface conditions; materials may stay damp after the air dries. The VTT index is 0–6 and retains exposure history.
The VEX curve and events demonstrate a possible response, not measured performance or a detection deadline. Gas changes prompt investigation; they do not alone confirm mould. A lower reading does not certify that remediation is complete.
VTT calculation source ↗Compare the features
| What it uses | Industry-standard VTT model | VEX + VTT |
|---|---|---|
| Temperature & humidity over time | Included | Included |
| Material-based growth modelling | Included | Included |
| Gas patterns associated with mould | Not an input | Additional sensing |
| AI room air fingerprint | Not part of the model | In development |
Developed in homes.
Tested in the lab.
Balanced accuracy
Predicting reported mould in homes using a refined VTT-based model.
Menneer et al., 2022 · Table 9 ↗Differentiation & prediction accuracy
Ofacto-reported result using our own test data.
Ask about our testing ↗Testing methods
We conduct laboratory testing for differentiation and prediction using Ofacto data. The published VTT-based figure measures balanced accuracy against residents’ mould reports. These results use different datasets and metrics.
VEX 0.5 in real rooms.
VEX 0.5
in use.
VEX 0.5 preview · 35 seconds
Explore earlier prototypes
The VEX iterations.
VEX 0.1.
Enclosure development.
Explore the 0.5 enclosure.
Drag the model or use the left and right arrow keys.
VEX / ENVIRONMENTAL SENSORPROTOTYPE 0.5
VEX
Reads the roomTemperature · Humidity · Gas
Loading prototype model…+
Get VEX pre-order updates.
Questions, answered.
What is an air fingerprint?
A room’s pattern of readings over time. Our AI algorithms are being developed to establish that pattern and identify meaningful changes.
Learn more ↗Can VEX detect mould before I can see it?
That is a development goal. Earlier-detection performance and lead time are being validated; there is no guaranteed warning period.
Learn more ↗Has independent testing been completed?
We are preparing independent mould assessments for the home pilot. We conduct internal laboratory testing; independent results have not yet been published.
Learn more ↗