| Base of Difference | Borland Silk Test Tool | Selenium Test Tool |
| Cost | Borland Silk Test is not free testing tool it is paid. | On the other hand Selenium is completely free test automation tool in market. |
| Languages | Basically Borland Silk test uses test scripting langauge. | On the other hand Selenium has flexible to use many langaues like Java, Perl, Ruby and many more. |
| Application Type | Borland Silk test can be used mainly for client server applications. | Selenium can only be used in web application. |
| Browser | Silk test mainly supports IE and Firefox.
| Selenium supports many browser like IE,FireFox,Safari, Opera and many more. |