Missive is a full collaborative email client. InboxBrief is a calm AI layer on top of your shared mailboxes: summaries, assignments, agenda - without switching tools to reply.
Missive merges shared email and team chat into a single client: you read, discuss and reply inside it. Powerful - but it's a new tool the whole team must adopt, billed per seat. InboxBrief takes the opposite angle: everyone keeps their habits, and the team shares a synthesis space - daily summaries of the shared mailboxes, assignable tasks, deadlines and an activity journal.
| Criteria | InboxBrief | Missive |
|---|---|---|
| Kind of tool | AI analysis layer on top of mailboxes (read-only). | Full email client: read, discuss and reply inside it. |
| Team adoption | Gentle: nobody changes email client. | Demanding: the whole team migrates to Missive. |
| Daily synthesis | Prioritized AI digest per shared mailbox, every morning. | No summary: the stream is read message by message. |
| Replying to customers | Out of scope: reply from your usual mail client. | Native: replies, shared drafts, send rules. |
| Pricing | Per team space, not per seat. | Per user per month. |
Connecting contact@ or support@ to InboxBrief gives the whole team a daily summary, assignments and a shared agenda - without changing anyone's email client, without training, without breaking habits.
Adding a member to the space costs nothing extra. For a growing SMB, the difference with per-seat pricing adds up fast.
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Missive adds a chat layer on top of email; InboxBrief removes noise: one digest, clear tasks, deadlines. Comments and @mentions exist - at an asynchronous pace.
No, by design: access is read-only. Every summary links back to the original email - you reply from Gmail, Outlook or your usual client. InboxBrief orchestrates, your mailbox executes.
If your core need is knowing what lands in the shared mailboxes, who owns it and by when - yes, at a fraction of the cost. If your team wants to co-write replies inside one shared client, Missive remains the right tool.