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