What is LeanBox?
LeanBox is an open-source AI inbox management agent that sorts and drafts replies to messages across email and chat apps, built for people who juggle several inboxes and want to self-host their own instance. It connects to Gmail, Instagram DMs, and Slack, with Microsoft support listed as coming soon, and triages incoming messages to flag what actually needs a response. For those messages it drafts replies for you to review, but it only drafts and never sends automatically, so you keep final control over anything that goes out. LeanBox also archives junk, suggests newsletters and subscriptions you could unsubscribe from, and gives a daily digest summary of your inboxes. Because it is open source and self-hosted, you run it on your own infrastructure and keep your message data private rather than routing it through a third-party service. It suits privacy-conscious users and developers who want an inbox-zero assistant they control end to end.
What is LeanBox used for?
Triaging and drafting replies across email and chat inboxes
How much does LeanBox cost?
Pros and cons
Pros
- Open-source and self-hosted, so your message data stays on your own infrastructure
- Connects to Gmail, Instagram DMs, and Slack (Microsoft coming soon)
- Triages messages and drafts replies, but never auto-sends
- Archives junk and suggests subscriptions to unsubscribe from
- Daily digest summary across inboxes
Cons
- Self-hosting requires technical setup and your own infrastructure
- Microsoft/Outlook support is not yet available
- Drafts only — you still review and send every reply manually
- No managed/hosted option mentioned for non-technical users
Questions about LeanBox
What is LeanBox used for?
LeanBox is used to manage busy inboxes. It triages incoming messages across Gmail, Instagram DMs, and Slack, drafts replies for you to review, archives junk, and produces a daily digest, all from a self-hosted instance.
Is LeanBox free?
Yes. LeanBox is free and open source. You host your own instance on your own infrastructure, so there are no paid tiers listed.
Does LeanBox send emails automatically?
No. LeanBox only drafts replies for your review and does not send them automatically, so you keep final control over everything that leaves your inbox.
Which platforms does LeanBox connect to?
LeanBox connects to Gmail, Instagram DMs, and Slack, with Microsoft support listed as coming soon.
What are the best alternatives to LeanBox?
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