Superinbox

Superinbox studies your past emails and learns how you write, then produces drafts that match the tone you'd use with each recipient. The company says drafts are context-aware and pull from both email history and documents you upload, which means the assistant can reference details from an earlier thread or a spec sheet without you pasting anything into the message yourself. You review each one and send with light edits. Why does that matter? Because a draft that sounds like a stranger is just more work to fix.

Every incoming email gets sorted into a category as it arrives, so your inbox stays ordered without manual filing. In practice it works like a Gmail AI email sorter that never sleeps. You can use the default categories or write simple prompts to define your own, and the tool applies them to new mail automatically.

There's no separate dashboard or browser tab to learn. None. Superinbox operates inside the mail clients you already use, which keeps your workflow unchanged. It supports Gmail and Outlook accounts only.

When a reply involves scheduling, Superinbox pulls your available slots from the calendar and puts them into the draft, which saves you from the tedious exchange of proposing times, waiting for a response, and then proposing again when the first option doesn't land. That removes most of the back-and-forth that usually follows a "when works for you?" message.

The sorter keeps low-value messages, like cold pitches and newsletters you never read, out of your main view. That means the messages that matter stay visible instead of getting buried under promotional mail, which is the exact thing that makes an overflowing inbox feel impossible to clear even when most of the pile is junk you'd never open anyway.

The service analyzes email in real time and says it stores no full copies of your messages, keeping only encrypted vector representations for AI processing. That design matters if you handle sensitive client mail, because nothing readable is left sitting on a third-party server after a message is processed. Third-party model providers aren't allowed to train on your data, and you can delete your data at any time.

Starter handles up to 2,500 emails a month, while Business raises that to 6,000 and adds a second inbox, custom labels, and PDF context. Enterprise adds advanced security, single sign-on, and shared org-wide knowledge. No tiers are cheap. Pricing starts at $25 a month.