Optimizely
162,903 websites

Optimizely offers both free and paid options

http://www.optimizely.com/

Simple, fast, and powerful. Optimizely is a dramatically easier way for you to improve your website through A/B testing. Create an experiment in minutes with our easy-to-use visual interface with absolutely no coding or engineering required...

VS

TNS
60,851 websites

TNS costs money

http://www.tnsglobal.com/

Transaction Network Services (TNS) is a leading global provider of data communications and interoperability solutions. By combining innovation, advanced technology, experience and service excellence, TNS delivers managed communications solu...

Market Share by Top Websites

1 Optimizely is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, TNS is clearly lagging behind, losing to Optimizely in all segments.

Websites Categories

1 Optimizely has better usage coverage in more websites categories. Including Games, Arts & Entertainment, Computers Electronics & Technology, Vehicles and 18 other categories.

2 TNS is leading in News & Media and Hobbies & Leisure.

Geography

1 Optimizely is leading in most countries, including United States, United Kingdom, Canada, Germany and 150 other countries.

2 TNS is leading in Russia, Ukraine, Belarus, Kazakhstan and 6 other countries.