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Email: traveller042@outlook.com
Website: www.iceres.cn
macOS 14 or later, on Apple silicon or Intel. TinySerial works fully offline and needs no account.
Any USB-to-serial adapter macOS recognises, including CP210x, CH34x and FTDI, plus boards with native USB CDC such as ESP32-S3 and RP2040. If a device appears under /dev/cu.* it will appear in TinySerial.
Install the driver your adapter's vendor provides, then unplug and replug the cable. Some USB-C hubs drop serial adapters — try a direct port before anything else. The device list refreshes when you reopen it.
Almost always a baud rate mismatch. Check the rate your firmware prints at, then the data bits, parity and stop bits. Turning on HEX view tells you whether real bytes are arriving at all.
Send the macOS version, the app version (shown in the sidebar), the adapter or board you are using, and what you expected to happen. A screenshot of the log usually settles it in one round.
TinySerial