Spark

Spark combines a genuinely smart inbox with team email features — shared drafts, internal comments, and email delegation without any extra tools. The free tier is generous and handles multiple accounts well. The AI compose is fast and surprisingly good.

Best free option for teams sharing an inbox. The smart categories work better than Gmail's tabs out of the box.

Every place Spark shows up across Choose My Stack — the research it’s part of and the articles that cover it.

The honest list