Duo Security vs YubiKey

Duo Security
Two-factor authentication done right. Duo Security lets your users use their mobile phones to secure their logins, protecting your company from account takeover. Duo’s solution is cloud-based, which means there's no software to install, and no server to set up. Our patented technology and drop-in integrations enable you to seamlessly integrate Duo into your existing application login workflow.
YubiKey enables strong, easy-to-use and affordable two-factor authentication with one-time passwords. Works instantly, no need to re-type pass codes from a device. Identified as a USB-keyboard, no client software or drivers needed
Comparing Duo Security vs YubiKey is like comparing apples to oranges. Because your business is unique and nobody except you can decide, which is better for your company. But we can add some fun to your research and suggest some new comparison parameters.

Ok, now let's compare the UI. Looks like YubiKey has more user-friendly interface than Duo Security because it's bigger. At least on our screenshots

To compare the popularity of the solutions we counted how many alternatives people search for each of them on the Internet. And it turns out that Duo Security is more popular than YubiKey

Now let's look at the recent activities of our competitors:

- Duo Security raised $70 million (in 2017)
- Duo Security unveiled new service to protect enterprises against data breaches (in 2015)
- Two-Factor authentication service Duo raises $12 million (in 2014)

Looks like Duo Security was recently more active than YubiKey (at least in our news). We also found some news, in which Duo Security and YubiKey meet head to head:

2017 - Duo Security raised $70 million to defeate YubiKey

Duo Security announced $70 million Series D funding at a valuation of $1.17 billion. The Michigan-based SaaS company works with more than 10,000 companies. The company’s main product is a two-factor authentication app but Duo also offers other security products to secure users and their devices. Duo’s solution is cloud-based, which means there's no software to install, and no server to set up. The new investment will help accelerate the company’s technical innovations and operations as well as securing new partnerships. The conclusion is that Duo Security is now more solid in comparison to YubiKey