Is it worth using 'World of Books' to recycle books?

Not worth the time or effort for what they offer. Give them to charity.

Depends how many books you’ve got to sell You only get between 10p and £1,50 for most books that they want and there’s many many they don’t want but it’s better than throwing them away
I sold on Ziffit for years now it’s one of the jobs I do at the charity shop but changed to ‘world of books’
bearing in mind we get through a lot of books we probably make about £20 ish a week, not much, but better than landfill
But if you ve only got a few books it probably won’t be worth a lot to you

You will only know if you try the app (it used to be called Ziffit) or try the desktop version here. You enter the ISBN number:

sell.worldofbooks.com/en-gb?gad_source=1&gad_campaignid=21891283356&gclid=Cj0KCQjw8p7GBhCjARIsAEhghZ0UIL_0nN5zUgdkKp98Bud6QxPDepK0naHgELb0-9ZJ2cy0egqqvWsaAiAHEALw_wcB

They will probably only give you pennies.

To donate you could send them to Oxfam. They will sell collectable books through their online store. My local Oxfam dedicated bookshop also sells collectable books. Some are quite valuable. They keep them in a locked cabinet.