Inogen One G4
- 90-95%
- Portable (Battery-powered)
- 1-3Pulse setting
Philips SimplyGo Portable Oxygen Concentrator
- 90-96%
- Portable (Battery powered)
- 0.5-2LPM
Inogen One G4 and Airsep Freestyle 5 are both Portable (Battery-powered) Portable (Battery-powered) Oxygen Concentrators with purity 90-95 %. However, they differ in areas such as Pulse Flow, mL dose, Weight and Operating altitude.
Below is a detailed comparison of Inogen One G4 and Airsep Freestyle 5 to help you understand their specifications, features, advantages, and key differences.
| Compare | ||
|---|---|---|
| Brand | Inogen | AirSep |
| Rating | ||
| Warranty |
3 year warranty
|
3 year warranty
|
| Purity | 90-95 % | 90-95 % |
| Type | Portable (Battery-powered) | Portable (Battery-powered) |
| Pulse Flow | 1-3 Pulse setting | 1-5 Pulse setting |
| mL dose | — | 8.75 mL |
| Weight | 1.27 kg | 2.8 kg |
| Operating altitude | 10000 feet | 12000 feet |
| Battery backup (at 2 pulse setting) | 2.7 hours | 2 hours |
| Recharge time | 3 hours | 3 hours |
| Backup with external battery pack | 5 hours | 7 hours |
| Oxygen Purity Indicator (OPI) | No | No |
| Sound level | 40 db | 41 db |
| Dimensions | 6.5H x 5.91W x 2.68D inch | 10.7H x 6.6W x 4.4D inch |
| Oxygen Purity % Analyzer | No | No |
| Indian Voltage Model | Yes | Yes |
| Loss of Power Alarm | Yes | No |
| Company Headquarters | USA | USA |
| System Malfunction Alarm | Yes | Yes |
| No Flow Alarm | Yes | Yes |
| US FDA Approved | Yes | Yes |
| FAA Approved | Yes | Yes |
| CE Certified | Yes | Yes |
| Literature | ||
| Brochure | Download Brochure | Download Brochure |
| User manual | Inogen One G4 User Manual | Airsep Freestyle 5 User Manual |
| Service manual | Inogen One G4 Service Manual | Airsep Freestyle 5 Service Manual |
Both Inogen One G4 and Airsep Freestyle 5 are listed as Portable (Battery-powered) oxygen concentrators, typically suitable for home and clinical use.
Inogen One G4 provides pulse flow of 1-3 Pulse setting, while Airsep Freestyle 5 provides pulse flow of 1-5 Pulse setting.
Both Inogen One G4 and Airsep Freestyle 5 provide medical-grade oxygen with a purity of 90-95 % across their flow range.
Both Inogen One G4 and Airsep Freestyle 5 come with 3 year warranty.
Both Inogen One G4 and Airsep Freestyle 5 are headquartered in USA.
Neither of the products has an Oxygen Purity Indicator.
Neither product has an Oxygen Purity % analyser and lacks this feature. This means none of the machines can display the actual oxygen purity percentage on the screen.
Inogen One G4 weighs 1.27 kg, while Airsep Freestyle 5 weighs 2.8 kg. A lighter model is generally easier to move and handle.
Inogen One G4 measures 6.5H x 5.91W x 2.68D inch, while Airsep Freestyle 5 measures 10.7H x 6.6W x 4.4D inch.


