This app calculates comfort levels by evaluating heat, cold, dryness, and moisture.
You can easily adjust values using a dial. Results are visually displayed using color and emoji indicators.
By inputting temperature and humidity, dew point, or wet-bulb temperature, the app calculates the following air conditions:
Relative Humidity (%RH)
Dew Point / Frost Point Temperature (°C DP / °C FP)
Wet-Bulb Temperature (°C WB)
Mixing Ratio (g/kg)
Absolute Humidity (g/m³)
Enthalpy (kJ/kg)
Specific Volume (m³/kg)
Vapor Pressure (hPa)
Saturated Vapor Pressure (hPa)
Discomfort Index (DI)
Wet-Bulb Globe Temperature (WBGT)
Comfort Indicator (18–28°C, 40–70% humidity)
When within the comfort range, a visual indicator using color or emoji will appear.
■ Main Features
Index Toggle (DI / WBGT)
Tap the DI section to switch between Discomfort Index and WBGT.
Atmospheric Pressure Input
Tap the pressure icon to select from:
Standard (1013.25 hPa)
Sensor (reads from internal barometer)
Weather Data (auto-fetched)
Manual Entry (800–1200 hPa, or 23–36 inHg with Pro)
Input Switching (% Icon)
Switch between relative humidity, dew point, or wet-bulb temperature.
In dew point mode, long-press to choose between dew point (condensation) and frost point (ice).
In wet-bulb mode, long-press to select psychrometer type:
・Assmann (ventilated, high accuracy)
・August (non-ventilated, simple)
・Sling (manual rotation)
When below 0°C, a freeze switch appears (automatic freeze below -10°C for Sling type). You can toggle freezing manually to match actual conditions.
Weather Auto-Fetch (Weather Icon)
Uses location to retrieve temperature and humidity from weather data.
Long-press to choose the provider: OpenWeatherMap or Apple Weather.
Reset (Circular Arrow Icon)
Restores default values (set in settings). Psychrometer resets to Assmann.
Long-press to set your own default temperature/humidity.
Info (i Icon)
Opens help and purchase screen.
– Pro Version Features –
Unlock the following:
・Ad Removal
Removes all ads.
・Unit Conversion
Switch between SI and US units:
°C ↔ °F
g/kg ↔ gr/lb
g/m³ ↔ gr/ft³
kJ/kg ↔ BTU/lb
m³/kg ↔ ft³/lb
hPa ↔ inHg
・Export Function
Export calculation results as text.
■ Calculation Specs
Saturated Vapor Pressure: Sonntag formula
Vapor Pressure: JIS Z 8806
Relative Humidity: WMO standard (denominator = vapor pressure of supercooled water)
Enthalpy: ASHRAE
■ Notes
Extreme inputs may cause errors.
Values may slightly vary due to rounding and internal conversion.
While accuracy is a priority, results are not guaranteed. The developer is not liable for any damage caused by app usage.
Seems like a decent app however I don’t see a way to change to Fahrenheit.
Cannot Use Fahrenheit
Dibrbenl
App works very well. It is disappointing one cannot change input to degrees F.
Developer Response
Thank you very much for your valuable feedback!We’re glad to hear that you find the app works well.Regarding your request to use Fahrenheit: this feature is available by upgrading through an in-app purchase. Once activated, you will be able to easily switch between Celsius and Fahrenheit for temperature input.We hope you will give it a try and enjoy an even more comfortable experience with our app!Thank you for your continued support.
As covers content
Xqmzrtf
The app is almost unusable because the banner ad covers the dry bulb temperature.
Developer Response
Thank you very much for taking the time to share your feedback.The app is designed so that the dry bulb temperature should not be covered by the banner ad. However, we will review this to ensure everything works as intended.Additionally, by upgrading through an in-app purchase, you can remove all banner ads for an even smoother experience.We hope you will give it a try and enjoy the app to its fullest.Thank you for your support!
No Fahrenheit.
CandyOlson
I was looking forward to using this but there’s no way to switch from C to F
Fixed display issues on the atmospheric pressure adjustment screen.
Improved behavior so that specific volume updates correctly when atmospheric pressure is changed.
Fixed an issue where the frost point temperature display did not switch correctly under sub-freezing conditions.
Revised the enthalpy calculation formula to comply with the ASHRAE definition.Enthalpy: ASHRAE
Version 5.2
The developer, JUN KANAYAMA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Location
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
JUN KANAYAMA
Size
10.6 MB
Category
Productivity
Compatibility
Requires iOS 18.6 or later.
iPhone Requires iOS 18.6 or later.
Mac Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
This app has an age rating of 4+ with content restrictions. Some content may be rated higher, but access is managed by the developer through in-app controls.
