Question: I'm looking for a solution that enables real-time collaboration and commenting on production-grade UI for my development team.

If you're looking for a service that lets you collaborate in real time and comment on production-grade UI, Liveblocks is worth a look. It includes features like presence, broadcast, comments, sharing and document browsing. Liveblocks is tightly integrated with many frontend frameworks and libraries so you can easily add collaboration abilities to your products without worrying about low-level infrastructure. Pricing is customizable, so it can fit a range of needs from small teams to large enterprises.

Another strong contender is Velt, a JavaScript SDK that lets developers add features like commenting, co-editing and real-time feedback. Velt supports different collaboration modes, including async and real-time collaboration, and supports video walkthroughs, approvals and file sharing. It also prioritizes ease of use and security, so it should work with a variety of tech stacks and use cases, like video editors, form builders and task managers.

If you're focused on design and UI/UX, Figma is a collaborative design tool that spans design, prototyping, development and feedback. It has features like AI-generated simple UI, auto layout, instant batch editing and AI-powered prototyping. Figma is useful for both experienced and inexperienced designers and helps teams build products faster by synchronizing design and code. It also has a wealth of resources and integrations with other tools.

If you're looking for a real-time digital experience platform, Ably could be a good fit. Ably offers APIs for building, extending and delivering applications with real-time abilities like live chat, data broadcasting and multiplayer collaboration. It offers a range of client and server libraries and a free tier with a good selection of features, so it's good for a broad range of industries and use cases.