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Serial Studio vs SerialTest: catalog facts
Serial Studio	SerialTest
Freemium Free GPL build; Pro costs $179 per year with a 14-day trial.	Free Free and open source, licensed under the GPL-3.0.
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	Serial, Bluetooth SPP, Bluetooth LE, TCP and UDP in one tool Realtime plotter for incoming data
MQTT, Modbus, CAN Bus and industrial protocols require the paid Pro edition Pro is a yearly subscription	Bluetooth LE support is client only Interface aimed at engineers rather than casual users
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account needed
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.