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HTerm vs SimplySerial: catalog facts
HTerm	SimplySerial
Free Freeware; the author accepts donations via PayPal.	Free Free and open source under the MIT licence.
Windows, Linux	Windows, Command line
ASCII, hex, binary and decimal input and output Works with hardware and virtual USB serial ports	Runs directly in a Windows console window Quick way to open a serial connection
Closed source freeware Configuration is done through an XML file	Windows only Basic feature set compared with full serial terminal programs
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.