A niche productivity tool on AppSumo in a long time!
This app is fantastic if you're an internet information hoarder and it is in my daily workflow now!
Before extension based tools to highlight web content were common, I used to copy/paste content, take full page screenshots, archive webpages...
With highlighting extensions, time was drastically saved.. there are many tools out there., but designed for solo use only... which was enough for me at the time.
But later, to work on content as a team., I had to resort to copy/paste partially again..

Collabwriting does a neat job on solving that.
The standout feature here is the collaboration. You have to try it to see how much it optimises workflow when multiple people work on something. It's simple to share to someone else, even if they don't have an account.

Texts, images, gifs are neatly captured by selecting. Helpful for researcing for content / compling information from multiple sources for academia..
Literally helped me close >3/4th of my chrome tabs//
I havent thought of Kindle content highlighting at all till now., that was a nifty idea :)

Things I would love to see implemented,
Folder based organisation! (atleast as a choice because i feel the team has put a lot of thought into cluster/topic based organisation). There is no option to create a cluster within a cluster., reason for leaning towards folders!
For image capturing, currently I found 2 ways → select and drag for any number of images / screenshot & add to comments. I would love to have image added by copying image address as well (like how a download manager captures the content)
Video embeds if thats possible., copying video address.

Good to see a committed team behind the product.
As for the deal, its a no brainer considering the price.. Grab ASAP if at all they come back...