CoolTerm for Mac

Key Details of CoolTerm

  • Monitor, troubleshoot, debug, or test serial port connections and performance
  • Last updated on 10/13/20
  • There has been 1 update within the past 6 months
  • The current version has 0 flags on VirusTotal badge_icon
  • Also available on Windows

Developer's Description

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.

Full Specifications

What's new in version 1.8

  • Replaced "Relative Time" timestamp format with "Time + Millis". It is now possible to record current time stamps with millisecond resolution, and the relative timestamp format is no longer necessary.
  • Renamed the "Absolute Date and Time" and "Absolute" timestamp formats to "Date and Time" and "Time", respectively.
  • Added code to improve accuracy for millisecond resolution timestamps.
  • Added option to add timestamps to received data displayed in the CoolTerm window. The timestamps are added to the actual data, i.e. they will also be present in hex view.
  • Added Preferences setting for smart display pausing. If enabled, scrolling up automatically pauses the display. Scrolling to the bottom automatically unpauses the display.
  • "PauseDisplay" is no longer a Connection Settings parameter.
  • Added "PauseDisplay(ID as integer, Value as boolean)" script command.
  • Added keyboard shortcuts to toggle RTS and DTR handshake lines.
  • Added "Remote" menu that is visible when the Remote Control Socket is enabled via the preferences. The menu item indicates if the socket is connected or not. The "Disconnect" menu item can be used to close and active connection.
  • Added context menu item to connection status label for an easy way to reveal the capture file.
  • Added button to "Save as Default" message dialog to open the default file location.
  • Selecting either the rated or maximum speed from the serial port information popup in the Serial Port Options, will set the baud rate to the selected value.
  • 32-Bit builds are no longer supported.
  • Added "GetFrontmostWindow as integer" script command.
  • GUI tweak for better compatibility with macOS Big Sur.
  • Added better error handling when the remote control socket port or HTTP server port are already in use by another app.
  • Updated code for line mode history so that its behavior is consistent with UNIX style consoles.
  • Updated code to use use Serial Port API 2.0.
  • Fixed bug in the script engine that prevented serial port parameters from being updated when a script changes them via "SetParameter".


Release October 13, 2020
Date Added October 13, 2020
Version 1.8

Operating Systems

Operating Systems Macintosh
Additional Requirements
  • macOS Big Sur
  • macOS Catalina
  • macOS Mojave
  • macOS High Sierra
  • macOS Sierra
  • OS X El Capitan
  • OS X Yosemite


Total Downloads 19,242
Downloads Last Week 19
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