Without controlling cloud application access, organizations are at risk of a security breach. Attackers are relentless. They hunt, phish, scam, and social-engineer everybody including privileged users to infiltrate your organization. OneLogin’s two-factor authentication process is straightforward. The user is first authenticated using a username and password. OneLogin looks up the user and if additional authentication factors are required, the user will be prompted to enter them on the login page.
Authy is free to use for less than 100 authentications per month. After which it follows a pay-as-you-go model where you are charged per authentication.
2 Factor Authentication Services in US Authy