Founded in 2017 and headquartered in Shenzhen, China, Topdon creates diagnostic and repair tools—OBD2 scanners, battery testers, key programmers, thermal imagers, EV chargers, and jump starters—serving professionals, DIYers, and dealerships Notable products include their compact Bluetooth dongle TopScan, Phoenix tablet-style scanners, and high-end Phoenix Max/Smart series. The TopScan supports full-system diagnostics across 70+ vehicle brands, live data streaming, bi-directional tests, and an in-app DTC repair guideEnthusiasts praise its customer support and reliability “TopDon products in general are pretty good… pulled ahead … due to their customer support. U.S. based real people answering the phone.”However, users warn about hidden subscription fees. After a free initial year, many Bluetooth tools require ~$50 yearly to maintain manufacturer‑specific diagnostics—without it, devices may become non-functionalIn summary, Topdon offers powerful, well‑built tools backed by solid support, but buyers should budget for potential annual subscriptions.