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CoolTerm is a simple serial port terminal application (no terminal emulation) that is geared towards hobbyists and professionals with a need to exchange data with hardware connected to serial ports such as servo controllers, robotic kits, GPS receivers, microcontrollers, etc.

Features include display of received data in text or hexadecimal format, support for multiple concurrent connection (if multiple serial ports are available), the ability to send data in text or hexadecimal format, local echo, hardware (CTS, DTR) and software flow control (XON), logging of received data to text files, and more. Written in more...

What's New


New/Changed Features:

  • Added preference setting to select the date and time format used for timestamps. The user can select between the SQL Date/Time format (YYYY-MM-DD HH:MM:SS) or the format determined by the users local system settings.
  • Added options to choose the timestamp type and modified the code to fix an bug where the millisecond count and more...


OS X 10.4 or later

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CoolTerm User Discussion

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MikeL9213 Member IconReview+1

Great app, thanks for making this available for free. I work a lot with embedded hardware and this is perfect for that. The hex view is especially useful. Thanks.

Reply0 replies
mr-rebo Member IconReview+1

Not only is it LION compatible, but the ability to control it with applescript is great. A big improvement over my old terminal program.

Reply0 replies
Naoh Member IconComment+133

This looks like a great alternative to DockLight on Windows.

I look forward to trying it out.

Maybe I will find myself with even fewer reasons to dual-boot my Mac.

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Stonebleeds Member IconComment+1

This is an excellent piece of software that let my Mac keep in touch with my older equipment better than Terminal did.

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ixulian Member IconReview+3

Great app. After finding out that Zterm did not work with Snow Leopard and my USB to Serial adapter, I found out about CoolTerm... I use it to configure Cisco devices, and so far it's been working great.
The only problem I found was that I can't recall previous entered commands by pressing the up arrow key.
If this feature was added, then I'd give it 5 stars.

Reply2 replies
Version 1.1.2
Artemis L

You hit it on the head. The up arrow happens to be necessary for me. I liked everything else about it, but I'll be stuck using screen for a while longer.


Version 1.2.0 support the Up/Down arrows to recall previously typed commands. Set the Terminal Mode to "Line Mode" via the connection settings. This will enable the up/down arrows to recall previous commands and it will give you a popup menu with previous commands as well.

etj Member IconReview+19

Great little app. Does what it says and useful for those who need this sort of thing. There are still lots of pure serial devices out there, and so for Mac types to try prototyping things this is a great help.

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Version 1.0
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> 5 10


Current Version (1.x)


Downloads 58,668
Version Downloads 16,277
Type Drivers / Other
License Free
Date 02 Sep 2013
Platform OS X / PPC 32 / Intel 32
Price Free
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