is generally bundled with Contec pulse oximeters. Compatibility: Windows-based PC.

Unlike basic alarms, SpO2 Assistant 3.1 delays the alert for 45 seconds to avoid reacting to transient dips (e.g., holding your breath briefly).

Patients with post-viral dysautonomia often experience occult hypoxemia (low oxygen without feeling short of breath). SpO2 Assistant 3.1’s silent monitoring catches these dips during daily activities. One user reported, "I had no idea my oxygen dropped to 87% when cooking. The app’s diary showed it happened every time after 15 minutes of standing. My doctor diagnosed POTS-related hypoxemia."

: Many users appreciate its accuracy for long-term recordings, especially for sleep apnea monitoring. The software is praised for generating detailed reports with strip charts, showing desaturation events and oxygen dips below 90%.

Right-click on the graph → → type label (e.g., “awake”, “position change”).

Supports automatic scanning and connection via USB or Bluetooth .

Measured in beats per minute (bpm), this records how frequently the heart contracts.

The device passes two wavelengths of light—red and infrared—through a translucent part of the body, typically a fingertip. Oxygenated hemoglobin absorbs more infrared light and allows more red light to pass through, while deoxygenated hemoglobin absorbs more red light. By calculating the ratio of light absorption, the device provides a percentage. In a healthy individual, an SpO2 reading typically ranges between 95% and 100%. A reading below 90% is clinically significant, indicating hypoxemia—a dangerously low level of oxygen in the blood.

Many people ask, "Why use software when a $20 finger pulse ox works fine?" Here’s the answer: