For end users looking to secure their internet logins and accounts, Authy is free to install and use. For help getting started using Authy and securing your accounts, please see our article Welcome to Authy!
If you are a developer looking to use Authy for your project's two factor authentication, you'll find that our cost is only based on successful authentications and delivery costs. We also offer flexible pricing so costs scale with your usage.
You can see full details on our Authy Pricing page.