Compare the same kind of service
Check whether a product translates written messages, transcribes speech or also plays translated audio in a Discord voice channel. Confirm the languages and plan limits in its current documentation. Do not assume that a speech-recognition engine, a text translation API and a complete Discord bot provide the same service.
Run the same trial conditions
Use the same microphone, sentence, language pair and network for each test. Check intelligibility, observed delay, permissions, privacy information and renewal conditions. NeuroVox’s Free plan lets you test five languages for 15 minutes per day after sign-in; languages outside that set require paid access.