The best I have used

This is an extremely useful and easy-to-use extension for Firefox that I use all the time (especially to extract sound files from music videos on YouTube for tracks which I haven't been able to find on the streaming services I use). I haven't had a single issue with the app and I highly recommend donating to the developer so that you get unrestricted use of all features.

Only allow download of videos that have been already downloaded recently by a paying user.

Estoy usando la app y pare estar bien documentada, eso es algo que apresiamos y buscamos en la web

Worked well until all of a sudden it starts asking for money. Refuses to download 1080p.

Прекрасно грузит .

They ask for money for something that is not real. Any other YT downloader dosn't have this problem.

a fuerzas te quieren hacer descargar aplicaciones, pesimo servicio

MP3には第3者のアプリがいる。

fine tool to get mp3's - works like a charm; my latest use is some months ago; not working anymore for me

Is only willing to download at 360p, and tells some lie about how the conversion "needs powerful server infrastructure". No it does not. That is a flat out lie. It should just do the conversion on my machine. Absolutely ridiculous.

Someone else recommended a software called Jdownloader. It isn't as convenient as a browser extension but it works pretty well.

it only downloads as cache, you have to pay... it sucks

Works as advertised. Needs to be more popular. No idea why Video DownloadHelper is more popular even though it literally does not work.

The one time I need this this trash doesn't work. Just let me download something and don't show me a message for Pro. If all your services are premium, don't bother offering it for free, just attach a pricetag to it.
I hate those premium scammers.