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sinceerly

Chrome extension that makes AI emails sound human

Last verified May 2026 3 min read

What is sinceerly?

sinceerly product thumbnail

Sinceerly is a Chrome extension that rewrites AI generated or stiff emails inside Gmail to sound more human and natural. Users click the extension on a draft and get a clearer, friendlier version before sending. It covers work emails, sales outreach, follow ups, job applications, and client messages. The live page returned an access error during research, so claims here lean on the source brief.

Why sinceerly works

AI written emails often land as obviously templated, which hurts replies on cold outreach and job applications. Sinceerly inserts a rewrite step inside Gmail rather than another tab, so the user can run a draft through a humanizer without breaking the email writing flow.

sinceerly features

  • In Gmail rewrite. A Chrome extension button rewrites the active Gmail draft in place rather than sending the user to another site.
  • Tone simplification. Drafts are rewritten in simpler, clearer words so messages stop sounding robotic or overly formal.
  • Multi use case coverage. Works across work emails, sales outreach, follow ups, job applications, client messages, and daily writing per the source.

Who sinceerly is for

  • Sales development reps sending high volume cold email who need replies to feel personal and not AI templated.
  • Job seekers writing cover letters and follow ups who want to soften the formality of an AI draft before sending.
  • Founders and agency owners handling client communication who want a quick sanity check before sending a long reply.
  • Non native English speakers writing professional emails who want a friendlier, clearer rewrite rather than a stiff one.

Similar micro SaaS ideas you can build

  • LinkedIn message humanizer. A Chrome extension that rewrites LinkedIn cold messages and InMails so they read as genuine, priced per sales seat per month.
  • Customer support reply softener. A browser extension for Zendesk and Intercom agents that rewrites canned replies in the brand's voice before sending, billed per support seat.
  • Job application bullet rewriter. An extension that takes resume bullets generated by AI tools and rewrites them into specific, action led lines on LinkedIn Easy Apply and Workday, sold as a job search subscription.
Frequently asked

sinceerly FAQ

Where does Sinceerly run?
The source describes it as a Chrome extension that works inside Gmail on email drafts.
What does it rewrite?
It rewrites AI written or overly formal emails into simpler, clearer, more human sounding versions.
What kinds of emails is it built for?
The source lists work emails, sales emails, follow ups, job applications, client messages, and daily writing.
Will it change what I want to say?
The brief positions the tool as a rewrite for tone and clarity rather than a content generator, though specifics should be confirmed on the live page.