Torr: Barometer Altimeter

Free barometer & altimeter — real-time pressure, altitude, 10-day forecasts with migraine alerts, automatic history logging, and CSV export all in one app.

The dashboard displays high-precision real-time measurement data, offering peace of mind for mountaineering enthusiasts and outdoor adventurers.
It uses your device's built-in barometric pressure sensor and GPS, allowing offline use.
Real-time trend graphs make it ideal for observing short-term changes during storms, sudden downpours, stair/elevator ascents/descents, or driving uphill.

The altimeter lets you simultaneously view readings from three sources — GPS, QNH (sea-level corrected pressure), and a calibrated value matched to a known elevation such as a trailhead.
Each altitude is displayed visually on an arch gauge, and you can tap each source to learn about its characteristics and accuracy.

For those sensitive to weather changes and suffering from migraines or weather-related illnesses, it provides graphs forecasting barometric pressure and weather for the next 10 days, along with medically grounded headache alert information updated every 6 hours.

Measured barometric pressure data is automatically stored within the app.
A background measurement mode enables measurements even when the app is in the background. You can view accumulated data and export it to CSV files.

【Features】
• Dashboard
• Barometer (atmospheric pressure via pressure sensor)
• Altimeter — view altitudes from 3 sources on arch gauges
• GPS Altitude (elevation above sea level via satellite positioning)
• QNH Altitude (sea-level corrected barometric altitude)
• Calibrated Altitude (calibration matched to a known elevation)
• Pressure Forecast
• Up to 10 days of nearby sea-level pressure values and weather forecasts
• Pressure graph showing trends like rises and falls
• 6-hourly migraine/weather sensitivity alerts based on medical evidence
• History
• Automatic data logging
• Daily history export to CSV files
• Background measurement mode
• 7 pressure units: Torr, hPa, kPa, mBar, psi, inHg, mmHg
• Color theme settings

【Note】
Some devices may not have a barometric pressure sensor. In such cases, certain dashboard features may not be available.
Location access and an internet connection are required for the barometric pressure forecast.
Location access is required for background measurement.
Weather data provided by Apple Weather.