Air Watcher vs LuxMeter

Air Watcher support both old Today Extension and new brand new iOS14 widget, and dark mode! You can long press the new widget and switch between different countries. Air Watcher is committed to be completely free and no ads! Monitor the air quality in the five supported cities in China. The data source is from U.S. Department of State Air Quality Monitoring Program. Support iOS14 new widget! In most of the time, you don't even need to open the app. More features to come!

LuxMeter turns your iPhone camera into a precise light meter, giving you instant illuminance readings in lux, foot-candles, or exposure value (EV). Whether you are checking lighting conditions for work, photography, or plant care, LuxMeter delivers real-time measurements derived directly from your camera's exposure metadata using the industry-standard APEX formula. The live gauge updates continuously as you move the camera, and the automatic brightness category — from Moonlight to Direct Sun — tells you at a glance what kind of environment you are in. Hold any reading to freeze the display and share it, or save a session to keep a timestamped log of your measurements. Key features: - Real-time lux readings powered by camera exposure metadata - Displays lux, foot-candles (fc), and exposure value (EV) - Animated gauge with live min, avg, and max statistics - Hold mode to freeze and share a reading - Session history with bar chart and inline notes - EV calibration offset to match a reference meter - Built-in lux reference table covering natural light, office, home, photography, and plant growth - Clean, distraction-free design with dark mode support