What is the crowd's opinion of Wipr?

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Giorgio is quite adamant (pun intended) about not implementing whitelisting support:

http://giorgiocalderolla.com/wipr-and-whitelisting.html

Apart from that it's:

• Incredibly fast (unnoticeable impact on browsing/loading speed)
• Regularly updated (mainly in conjunction with the iOS version)
• Giorgio is very responsive on Twitter and via eMail
• Giorgio is up 2 speed with regards to Safari/Content-Blocker API bugs and works with Apple on fixing some of them

That's quite a lot for a "simple" content blocker IMO.

I think the new content blocking mechanism (introduced by Apple in El Capitan) can do this. The link above mentions some "new adblockers" in the first post, but you'd have to read through all pages to find more.

For wipr specifically, I saw that the developed has talked about whitelisting a year ago http://giorgiocalderolla.com/wipr-and-whitelisting.html.

Hi! I'm him. Ask away :) Or you can find my email address here: http://giorgiocalderolla.com/support.html

I'm currently running a beta for Wipr 1.1 which will let you contact me straight from the app. If anyone would like to join the beta, let me know!