6. A computer-implemented method comprising: receiving, by a computing device comprising one or more processors, a first request to generate a first audio representation of a first text; determining, based at least on a first characteristic of the computing device, to use a local text-to-speech module to generate the first audio representation; generating the first audio representation using the local text-to-speech module; receiving a second request to generate a second audio representation of a second text; determining, based at least on a second characteristic of the computing device, to use a remote text-to-speech system to generate the second audio representation; sending the second text to the remote text-to-speech system; and receiving the second audio representation from the remote text-to-speech system.
6. A computer-implemented method comprising: receiving, by a computing device comprising one or more processors, a first request to generate a first audio representation of a first text; determining, based at least on a first characteristic of the computing device, to use a local text-to-speech module to generate the first audio representation; generating the first audio representation using the local text-to-speech module; receiving a second request to generate a second audio representation of a second text; determining, based at least on a second characteristic of the computing device, to use a remote text-to-speech system to generate the second audio representation; sending the second text to the remote text-to-speech system; and receiving the second audio representation from the remote text-to-speech system. 8. The computer-implemented method of claim 6 , wherein the second characteristic comprises one of: a presence of a network connection; a low latency of an available network connection; an absence of voice data on the computing device; a computing capability of the computing device; or a type of application requesting the audio representation.