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Lowtide vs Claude Duet: a list that keeps up, or an agent that checks in?

Updated October 21, 2026

Short answer: For keeping up with what you owe people as it happens, Lowtide is the better choice: it reads Slack as messages arrive and Gmail every minute, keeps the replies you owe, the answers you’re waiting on and the promises from your meetings in one list in your Mac’s menu bar, with your Claude Code and Codex sessions beside them, and it’s free during early access. Claude Duet is the better fit if you have Claude Pro or Max in the US and want an agent on your phone that takes whole tasks off your plate, like scheduling, chasing invoices or buying something, with your approval.

What’s the difference between Lowtide and Claude Duet?

Claude Duet is an agent that works for you in the cloud. Each morning it looks across your email and calendar, picks what most needs you and can start on it, and through the day it takes on tasks, such as setting up a meeting, drafting a reply or chasing an unpaid invoice, on its own machine, asking before anything goes out. Lowtide is a list on your Mac: the replies you owe, the answers you’re waiting on and what you promised, in meetings or in writing, most pressing first, each with the reason it’s there and a draft ready, and each closing as you answer, in whichever app you answer in.

Duet takes tasks off your plate. Lowtide makes sure nothing you owe a person slips.

How quickly does each one notice?

Duet checks your accounts at set intervals, every few hours, since checking all the time would use up your Claude plan’s limits faster, and Anthropic says something urgent can arrive between checks. Lowtide reads Slack as messages arrive and checks Gmail every minute, so a question that needs you is on your list within a minute or two.

What about meetings and promises?

Anthropic doesn’t describe Duet reading meeting notes or keeping track of what you promised; it prepares briefs before your meetings. Lowtide reads your Granola notes, or the recap Zoom, Google Meet, Fathom, Fireflies or Otter emails you, and turns what you promised into cards that stay until you’ve done it, closing on their own when an email or Slack message keeps the promise. It catches what you promise in writing (“I’ll send it Friday”) and what others promised you, too.

What about coding agents?

Duet runs in the cloud, and Anthropic says it can’t see all of your projects or the files on your computer; nothing describes it seeing Claude Code sessions. Lowtide puts Claude Code and Codex sessions waiting on your answer in the same list as your email, so you can approve a command or send the next prompt from the menu bar, or from your phone through your Slack DM.

How much do they cost?

Duet comes with Claude Pro and Max in the US at no extra cost during its research preview, which you join by waitlist, and its work, the morning brief and check-ins included, counts against your plan’s usage limits. Lowtide is free while it’s in early access.

Can you use both?

Yes. They do different jobs: Duet for handing off tasks from your phone, Lowtide for the running list of what you owe people on your Mac. Both draft email replies, so you’d pick which one writes them.

Choose Lowtide if

• You want to know as soon as something needs you, not at the next check-in.
• You want promises from your meetings kept on a list until they’re done.
• You run Claude Code or Codex and want them in the same list as your email.
• You want cards that close on their own once you’ve answered, in whichever app.

Choose Claude Duet if

• You have Claude Pro or Max in the US and want an agent that takes whole tasks off your plate.
• You work mostly from your phone.
• You want it to set up meetings, chase invoices or buy things, with your approval.
• You use QuickBooks, HubSpot, Docusign or Calendly.