| Functional Differences |
Free Edition ¹ |
Professional Edition |
| Max. Number of Simulated Users |
limited to 20 |
200 ... up to unlimited number  (depending on the license) |
| Support of Exec Agent Clusters |
no |
yes ² |
| Max. Load Test Duration |
12 minutes per load test job |
unlimited |
| User's Think Time per Web Page |
3 - 30 seconds |
0 - 900 seconds |
| HTTPS Support (encrypted connections) |
no |
yes |
| Authentication Methods |
- HTML form based authentication - basic and digest authentication - NTLM |
- HTML form based authentication - basic and digest authentication - NTLM  - PKCS#12 client certificates |
| Support for SOAP and XML Data |
yes |
yes |
| Support for AJAX Applications |
yes |
yes |
| Support for Load Test Plug-Ins |
no |
yes |
| Creation of PDF Measuring Reports |
yes ³ |
yes |
| Data Export of Measured Data |
no |
yes |
| Page Scanner Restrictions |
max. 10 pages |
none: unlimited number of pages |
| Command Line Support |
no |
yes |
| Supported OS |
Windows XP/2003/Vista |
Windows XP/2003/Vista and all Unix-like OS: Solaris, Linux, BSD, Mac OS X ... |