Titktok bulk video download

yt-dlp is your go for this type of stuffs, it downloads from instagram and tiktok and it's free

PS : it doesn't have a GUI interface only CLI, look on youtube or their reddit or directly on the wiki of their github page

You can use Online Services, Browser Extensions, and many other websites where you can download videos for free. If you want to download a lot of videos at once, you can also use AdsPower's multi-window sync tool to help you synchronize the downloads with one click.