Async communication is not only a set of tools. It is a promise that people can absorb context on their own time without losing the thread.
Loom is still the best async communication tool for short video updates and walkthroughs. Slack can work asynchronously when teams use channels and threads with discipline. Notion is better when the point is persistent written context people can return to later.
The short answer
Use Loom for quick video context, Notion for durable written context, and Slack only if your team can use chat without turning everything urgent.
Top picks
Best best async communication tools
Loom works because some things are still easier to show than to write.
Watch for this: Too many videos create another backlog if summaries and next steps are missing.
Notion is useful when the communication should remain clear a week later, not only today.
Watch for this: It is slower for quick back-and-forth than chat or video.
Slack can support async work if the culture is disciplined about response expectations.
Watch for this: Without that discipline, it becomes the opposite of async.
What async communication should solve
It should reduce interruptions and preserve context. The real benefit is not only fewer meetings. It is clearer thinking because people get time to respond with better judgment.
That only works if the tools make context easy to consume later. Otherwise async becomes delayed confusion.
Why video and writing should work together
Video is great for tone, demos, and walkthroughs. Writing is better for decisions, references, and future retrieval. Teams that use both well usually communicate better than teams that force one format onto everything.
That is why Loom plus a written summary works so well. Show the issue. Then document the decision clearly.
The culture problem software cannot solve
If everyone expects an instant answer anyway, the async stack will fail. People will record videos, write docs, and still call a meeting because nobody trusts the pace.
The tool helps, but the norm matters more. Async only works when the team agrees what must be urgent and what does not.