Rhombus IM requires Java 1.4.1 or higher. For the best results, use Java 1.4.2, if it is available on your platform. Currently, Rhombus IM is tested and supported on the following operating systems and architectures:
| Architecture | Versions | Suggested Hardware |
| Microsoft Windows | NT 4 2000 XP Server 2003 |
Intel Pentium 4 or dual Xeon class 512 MB RAM 100/1000 NIC |
| Linux | Debian 3.0 Red Hat 8, 9 |
Intel Pentium 4 or dual Xeon class 512 MB RAM 100/1000 NIC |
| SUN | Solaris 8 Solaris 9 |
UltraSPARC II or higher 512 MB RAM 100/1000 NIC |
| AIX | AIX 4 with JVM 1.4.1 |
POWER3-II or higher 512 MB RAM 100/1000 NIC |
| Mac OS X | OS X 10.2 "Jaguar" OS X 10.3 "Panther" |
G4 400 MHz or higher, G5 recommended 512 MB RAM 100/1000 NIC |