mac-usb-serial.com

What It Is

Mac USB Serial is a macOS USB-to-serial (RS-232) driver developed by the Dutch company Repleo. It mainly targets common low-cost chips such as CP2102, CH340, CH341, and PL2303, aiming to solve compatibility pain points for developers and hardware engineers using these serial devices on a Mac. The project began as an open-source project in 2006 and has since become commercial closed-source software.

Core Analysis

• Features and Use Cases: The driver provides stable data transmission and broad RS-232 feature support, including baud rates up to 230400, 5–8 data bits, hardware/software flow control (CTS/DSR, XON/XOFF), handshake line control, and Break signal transmission. It is widely applicable to Arduino/AVR/ESP8266 programming, Cisco router configuration, and even debugging embedded devices such as coffee machines and GPS trackers.
• Supported Languages/Frameworks and Ecosystem: As a system-level KEXT driver, it integrates seamlessly with macOS. The documentation includes a Swift serial programming guide and compatibility with tools such as CoolTerm and VirtualBox. On the hardware ecosystem side, it comes with configuration profiles for more than 150 devices, including Waveshare and Sabrent, enabling plug-and-play use.
• Open Source and Self-Hosting: Closed-source commercial software, with no self-hosting option.
• API/SDK and Documentation Quality: No dedicated API/SDK is provided, but the documentation is well written, covering installation, troubleshooting, uninstall guides, and practical tutorials for Arduino and Swift.

Pricing

Mac USB Serial uses a one-time purchase model and costs €11.98, with occasional discounts to €6.9. A free Serial Detect App is also available so users can check device compatibility before purchasing.

Pros and Cons

Pros: Very simple installation with no command-line work required; the KEXT is officially signed and notarized, so there is no need to lower system security settings; comprehensive RS-232 feature support, addressing compatibility gaps in some open-source drivers such as 7-bit data handling or Break signal support.
Cons: The critical drawback is that it does not support macOS Big Sur or newer, and is limited to Catalina (10.15) and older systems; Mac-only; paid software.

Who It’s For

Hardware developers, network engineers, and embedded hobbyists who are still using macOS Catalina or older and are struggling with driver issues for inexpensive serial devices, such as clone Arduino boards.

Access from China and Alternatives

The website is hosted in the Netherlands, and its accessibility from China is unknown. Payment methods are not clearly stated, though international credit cards are likely supported. Since it does not support newer versions of macOS, users in China on modern systems are better off buying the FTDI-chip-based options recommended in the text, or looking for open-source CH340/CP2102 drivers as alternatives.