Audyo
Audyo is very simple and easy to use tool to convert text into audio with human quality AI voices. You can login directly with your Google account or open an account with your email address.
There are 4 packages starting with a freemium account where you have 1 hour of audio. The next one is the Creator package for $10 per month with 6 hours of audio. For $30 per month you have the Pro package with priority support and removing of watermark.
If you are looking for unlimited number of hours and have API access, you can go for the Enterprise package.