There are completely free tools that do audio syncing, though with fewer features than Syncaila:
Syncaila is a video editing auto-sync tool that synchronizes audio and video clips based on their waveforms. Like most commercial software, it requires a valid license key to unlock full functionality. Below is a factual explanation of how the license key works in Syncaila. syncaila license key work
An old license key may not work with a brand-new major version (e.g., v2.x vs v3.x). Syncaila’s developers often change the encryption algorithm. There are completely free tools that do audio