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Zero

Open-source AI email client.

Visit Zero » 0.email

Zero at a glance
What it doesOpen-source AI email client
CategoryWriting & Email
Website0.email
CheckedWebsite working when last checked (2026-10-16)

In their own words

“Experience email the way you want with 0 - the first open source email app that puts your privacy and safety first.”
— from the Zero website

8 alternatives to Zero

Other writing & email tools that do similar things:

Mailbird

Desktop email client with AI writing help

eM Client

Email client with built-in AI writing assistant

LibreTranslate

Free and open-source machine translation

Superhuman

Fast email app with AI writing and sorting

Ellie

Browser extension that writes email replies in your style

Spike

Conversational email app with AI writing tools

Hoppy Copy

AI email marketing copy writer

Nureply

AI cold email writing and outreach

See all Writing & Email tools »

How to choose

  1. Decide if you want help fixing your own words (a checker) or someone to draft for you (a writer). They're different tools.
  2. Pick one that works where you write: browser, Word, Google Docs or your email app.
  3. Always read and edit AI drafts. Readers notice generic, robotic writing.

Full guide to choosing writing & email tools »

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