Differences between 2.3, 4 and 5

Overview of difference between Teraterm 2.3 (original version) by Takashi Teranishi and Tera Term 4 and Tera Term 5.

Feature Differences

Content	Tera Term Pro 2.3	Tera Term 4	Tera Term 5
Source code	Opened	Opened	Opened
License	Proprietary*1	Modified BSD license*2	Modified BSD license
Development tool	Visual C++ 5.0 / Watcom C/C++ 11.0	Visual Studio 2005	Visual Studio 2022
Icon	*3
Maximum COM port	16	4096	4096
Serial speed	from 110 to 115200	from 110 to 921600, and editable	from 110 to 921600, and editable
Japanese character code	EUC-JP/Shift_JIS/JIS	EUC-JP/Shift_JIS/JIS/UTF-8/UTF-8 MAC	EUC-JP/Shift_JIS/JIS/UTF-8
Unicode support	Not supported	Support single language*4	Support multi language
IPv6 support	No	Yes	Yes
i18n support	No	Yes*5	Yes
Linked library*6		Oniguruma used as the regular expressions library SFMT used as the random number generator	Oniguruma used as the regular expressions library SFMT used as the random number generator
TTSSH icon
supported SSH version	SSH 1.5	SSH 1.5 and 2	SSH 1.5 and 2
supported SSH feature	shell, port-forwarding, X11 forwarding	shell, port-forwarding, X11 forwarding, SCP	shell, port-forwarding, X11 forwarding, SCP
Pageant*7 collaboration	No	Yes	Yes
Linked library*6	SSLeay used as the cryptographic library (libeay32.lib) not used as SSL library (not ssleay32.lib) zlib used as the compression library	OpenSSL used as the cryptographic library not used as TLS library zlib used as the compression library argon2 used for decrypt PuTTY private key file PuTTY used for display tooltip used for cooperation with Pageant not used for communication and terminal emulation	LibreSSL used as the cryptographic library, but not used as TLS zlib used as the compression library argon2 used for decrypt PuTTY private key file PuTTY used for display tooltip used for cooperation with Pageant not used for communication and terminal emulation RLogin used for cooperation with Pageant
Proxy	No	Yes*8 (HTTP, TELNET, SOCKS4, SOCKS5)	Yes (HTTP, TELNET, SOCKS4, SOCKS5)

• [*1] Without written permission by the author (Takashi Teranishi), you may not distribute modified versions of this package, and may not distribute this package for profit.
• [*2] Tera Term is distributed under Modified BSD License.
• [*3] Icon designer is Tatsuhiko Sakamoto.
• [*4] Tera Term can not simultaneously display multi languages because it has not completely implemented as Unicode API. Now Tera Term mutually converts between Unicode(UCS-2) and MBCS. Also, Chinese version Windows can display Chinese characters when you configure the locale for Unicode.
• [*5] You can switch the message language by using the language file(lang\*.lng). You need to re-startup Tera Term to active new message language.
• [*6] Detail of libraries
• [*7] An SSH authentication agent for PuTTY and WinSCP.
• [*8] Using TTProxy.