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Serial Port Assistant vs Serial Studio: catalog facts
Serial Port Assistant	Serial Studio
Free Free and open source under the GPL-3.0 licence.	Freemium Free GPL build; Pro costs $179 per year with a 14-day trial.
Windows, macOS, Linux, Android	Windows, macOS, Linux
Runs on Windows, Linux, macOS and Android Long-maintained project with hundreds of commits	Supports Arduino, ESP32, STM32 and other boards over serial Code-free frame templates or JavaScript and Lua parsers
Interface and documentation lean toward technical users Little feature detail on the project page	MQTT, Modbus, CAN Bus and industrial protocols require the paid Pro edition Pro is a yearly subscription
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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