oTerminal is an universal and easy to use terminal program for ethernet communication (TCP/IP) and serial ports.

With oTerminal and a standard ethernet to serial converter, it is easy to connect serial devices with different baud rates. It is also possible to connect ethernet devices that use a low level binary protocol such as Modbus. To connect direct to a RS232 of RS485 port, a serial (usb) device adapter / converter is needed.

If you have a problem using oTerminal, please don't write a review, but send us an e-mail so we can help.

What’s New

Version 2.0

Serial (usb) device and some new functions
After update the defaults are restored
Sandboxed for security
Bug fixes

Ratings and Reviews

3.8 out of 5
5 Ratings

5 Ratings

helloiammacintosh ,

It worked for my Serial connections.

I usually don’t write reviews and just leave it up to others to comment. I initially bought it to console my Watchguard Firebox modded with pfSense. No problems/easy setup. I just bought a Foundry Fastiron LS648. Swapped my settings and compatible cable... bam. Works. I’m familiar with Windows Putty, and it does a lot, but just get me on the job to do what I need to do. It works and works very well! 5 star recommend. I hope the keywords pick up in the iTunes search engine. I scoured the web for an Apple app such as this. People should know about this solution outside of the Apple ecosystem. It solves a huge issue rather than messing with OS X terminal, or pulling out the Windows machine.

John - Subscriptions ,

Supports both Ethernet and RS-232 Connections

When I need to communicate with a device in which testing the IP over RS-232 comm layer is necessary, I used to have to bust out my PC and run an app called "Hercules". Now, I no longer require the PC to have an ethernet terminal session. And this app also supports serial connections which makes it very flexible, and is icing on the cake.

cragthehack ,

Ever since upgrade app has been crashing

It was perfect at one time. But ever since the upgrade the app crashes when connecting to any IP with a port. Now I’m forced to boot into windows and use Putty.


Opticom Engineering B.V.
1.3 MB

OS X 10.6 or later, 64-bit processor



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.