Newton's AI features only read your email when you use them, or once a day if you turn on Recap. Write with AI, Translate and Recap send text through Newton's servers to an AI model. The desktop Agent uses your own Claude account instead.
How it works
Write with AI (desktop and mobile): when you send an instruction, Newton sends it with your draft, the subject, your recipients' names and addresses, your sender name and the conversation you're replying to. Your signature and attachments aren't sent. Rewriting a selected passage on desktop sends that passage, with the rest of the draft as context.
Custom instructions you save at account.newtonhq.com › General › Custom instructions are stored by Newton and sent with each Write with AI request.
Translate sends the text of that one email, without the earlier messages quoted in it, up to 4,000 characters.
Recap (Pro, off until you turn it on): once a day, Newton's servers look through your recent mail. For emails that might need a follow-up, they send the newest part of the email to an AI model, as plain text of up to 2,000 characters. Newton stores each Recap item's sender, subject, a short preview and the reason it's listed, and clears the subject and preview after you mark it Done.
Agent (desktop only): needs your own Claude Code, version 2.0.0 or later, signed in on your computer. Email the Agent reads is sent to Anthropic under your own Claude subscription. Your conversations are also saved to your Newton account so they sync, and they stay until you delete them.
For Write with AI and Translate, Newton's servers don't keep your text or the AI's answer. They only record how often you used each feature.
Good to know
Each AI feature can be used 200 times in 24 hours, on every plan. After that you'll see "Daily AI limit reached — try again tomorrow."
To stop Recap reading your mail, switch off Show Recap in Settings › Supercharge › Recap.
To delete Agent conversations, use Delete all conversations in the Agent's conversation list.