Hygrometer Downloads & RevenueHygrometer - Humidity Meter · App Store & Google Play

Mould does not grow because a room is humid. It grows on the one surface that is colder than the rest — a corner, a window reveal, the wall behind a wardrobe. The air touching that surface can sit at 97% while the middle of the room reads a comfortable 55%.

Hygrometer works out what is happening on that surface, and tells you the humidity to keep the room under.

WATCH A ROOM
• Add the cold surface you are worried about: a corner, a window reveal, an uninsulated wall, single or double glazing
• See the humidity at that surface, not just in the room
• Get the limit for the room, worked out from the surface temperature and the weather outside
• That limit moves with the forecast — the same wall tolerates 73% on a mild day and 41% in a cold snap

THREE WAYS TO GET THE NUMBERS
• A HomeKit humidity sensor, read automatically — Eve Room, Aqara, SwitchBot, Netatmo and others
• Typed in from your own hygrometer, whenever you check it
• Or neither: Hygrometer estimates the likely range from the outdoor conditions and how the room is used, using the EN ISO 13788 humidity classes. Shown as a range, never as a measurement of your room

WARNINGS THAT ARRIVE IN TIME
• Mould risk when the surface reaches 80% humidity, which is long before anything looks wet
• Condensation when the surface falls below the dew point
• And before either: a colder forecast tonight pulls the limit down, so the warning comes before the surface turns, not after

SHOULD YOU OPEN THE WINDOW?
The answer relative humidity gets backwards. Airing out only dries a room when the outdoor air carries less water in absolute terms. In winter it nearly always does, even at 90% outside. On a warm humid day it often does not, and opening a cool room makes it damper. Hygrometer compares both sides in g/m³ and names the driest hour of the day.

THE OUTDOOR INSTRUMENT
• Outdoor relative humidity on a 0–100% analog dial with comfort bands
• Dew point, absolute humidity in g/m³, mixing ratio, pressure and conditions
• 24-hour humidity chart
• Home Screen and Lock Screen widgets, which fetch their own reading rather than waiting for you to open the app

ALSO
• Follow your location, or search any city worldwide
• °C / °F throughout
• Eight languages
• No account, no tracking, no ads

Outdoor readings come from Apple Weather. Indoor readings come from your own sensor or from you — iPhone has no humidity sensor, and this app never pretends otherwise.

Weather data provided by Apple Weather.

Mould does not grow because a room is humid. It grows on the one surface that is colder than the rest — a corner, a window reveal, the wall behind a wardrobe. The air touching that surface can sit at 97% while the middle of the room reads a comfortable 55%.

Hygrometer works out what is happening on that surface, and tells you the humidity to keep the room under.

WATCH A ROOM
• Add the cold surface you are worried about: a corner, a window reveal, an uninsulated wall, single or double glazing
• See the humidity at that surface, not just in the room
• Get the limit for the room, worked out from the surface temperature and the weather outside
• That limit moves with the forecast — the same wall tolerates 73% on a mild day and 41% in a cold snap

THREE WAYS TO GET THE NUMBERS
• A HomeKit humidity sensor, read automatically — Eve Room, Aqara, SwitchBot, Netatmo and others
• Typed in from your own hygrometer, whenever you check it
• Or neither: Hygrometer estimates the likely range from the outdoor conditions and how the room is used, using the EN ISO 13788 humidity classes. Shown as a range, never as a measurement of your room

WARNINGS THAT ARRIVE IN TIME
• Mould risk when the surface reaches 80% humidity, which is long before anything looks wet
• Condensation when the surface falls below the dew point
• And before either: a colder forecast tonight pulls the limit down, so the warning comes before the surface turns, not after

SHOULD YOU OPEN THE WINDOW?
The answer relative humidity gets backwards. Airing out only dries a room when the outdoor air carries less water in absolute terms. In winter it nearly always does, even at 90% outside. On a warm humid day it often does not, and opening a cool room makes it damper. Hygrometer compares both sides in g/m³ and names the driest hour of the day.

THE OUTDOOR INSTRUMENT
• Outdoor relative humidity on a 0–100% analog dial with comfort bands
• Dew point, absolute humidity in g/m³, mixing ratio, pressure and conditions
• 24-hour humidity chart
• Home Screen and Lock Screen widgets, which fetch their own reading rather than waiting for you to open the app

ALSO
• Follow your location, or search any city worldwide
• °C / °F throughout
• Eight languages
• No account, no tracking, no ads

Outdoor readings come from Apple Weather. Indoor readings come from your own sensor or from you — iPhone has no humidity sensor, and this app never pretends otherwise.

Weather data provided by Apple Weather.

Hygrometer is a powerful humidity monitor that turns your phone into a smart humidity tracker. Measure indoor humidity in real-time using your device sensor, compare it with live outdoor weather data, and get personalized health recommendations based on current conditions.

Whether you're managing allergies, preventing mold, optimizing home comfort, or caring for indoor plants, Hygrometer gives you the tools to understand and control your environment.

REAL-TIME HUMIDITY MONITORING
- Beautiful circular gauge displaying live humidity percentage
- Color-coded status indicators: Dry, Good, and Wet
- Automatic sensor detection with weather API fallback for devices without a humidity sensor

INDOOR & OUTDOOR HUMIDITY
- Indoor humidity from your device's built-in sensor
- Outdoor humidity and weather conditions via live weather data
- City name, weather description, and side-by-side comparison
- Automatic location-based weather updates

SMART HUMIDITY ALERTS
- Create multiple custom alert profiles
- Set min/max humidity thresholds for each profile
- Schedule alerts by time of day and day of week
- Enable or disable sound and vibration per profile
- Custom notification messages
- 5-second cooldown to prevent notification spam

ANALYTICS & HISTORY
- Interactive line chart showing humidity trends over time
- Distribution bar chart across humidity ranges
- Filter by Last 24 Hours, 7 Days, 30 Days, or 3 Months
- Track average, minimum, and maximum humidity
- Total reading count and historical data storage

HEALTH RECOMMENDATIONS
- Personalized tips based on current humidity level
- Respiratory health, skin care, and eye comfort advice
- Mold prevention and allergen control guidance
- Sleep quality and indoor comfort tips
- Plant health and seasonal care suggestions
- Health risk assessment: Low, Medium, and High

ADDITIONAL FEATURES
- Dark mode with System, Light, and Dark theme options
- Sound alarm when humidity crosses your set threshold
- Haptic feedback on interactions
- Material Design 3 modern interface
- Works on Android 7.0 and above
- Lightweight and battery friendly

PERFECT FOR
- Home health and comfort monitoring
- Allergy and asthma management
- Mold and moisture prevention
- HVAC optimization
- Indoor gardening and plant care
- Baby room and nursery monitoring
- Basement and storage humidity tracking
- Musical instrument and electronics care

Download Hygrometer now and take control of your indoor air quality!

• Premium prices no longer get stuck on "Loading…" when Google Play cannot be reached
• The Premium screen explains the monthly, yearly and lifetime plans correctly in every language
• Dates now follow your language's usual order
• Numbers typed with a decimal comma are read correctly everywhere
• Ads wait for your privacy choice before loading