Print Conductor vs QZ Tray

Print Conductor has no write-up on Specifiction yet; its figures are above.

QZ Tray connects web clients to local printers and attached devices, enabling browser-based printing and hardware communication through its JavaScript connector. Printing support includes PDF, PNG, HTML, PCL, ESC/POS, EPL, ZPL, SBPL, and FGL. Device connections can use serial, HID, USB, socket, or file I/O. The maker lists Zebra, SATO, Epson, Citizen, Star, Boca, and Dymo among compatible printer brands. Desktop editions run on Windows, macOS, and Linux, including Intel and ARM or Apple Silicon systems; supported platforms also include iOS, Android, and ChromeOS. QZ Tray can be downloaded and used for free, with warnings, and the maker offers a free demonstration with warnings. Removing print dialogue warnings and enabling silent printing requires message signing with a certificate and private key. QZ says the signing keys are generated in the customer's browser and that it never receives a copy of the private key. Only one instance can run per machine because the software uses a localhost WebSocket connection to a single port. Premium Support costs $749.00 per year.