Low bitrate audio codecs are primarily used for downscaling audio for slower internet connection speeds and supporting older devices. They can handle high rates of packet loss while still sounding natural. For example, Opus 1.5 still sounds good at 6 kb/s and narrowband sampling rate (8 kHz compared to 48 kHz).
| Project | Organization | Open source |
|---|---|---|
| Lyra | Yes | |
| Mlow | No | |
| Opus | Xiph | Yes |