xiry.

Productivity · Web app

Sinceerly

AI tool that rewrites drafted emails to sound casual, sloppy, or human

From the Xiry library · Updated 10 October 2026

Visit sinceerly.com ↗

Sinceerly is an AI-powered email writing tool—styled as an 'anti-Grammarly'—designed to make formal, robotic drafts sound like they were written by a real person. Operating through a Gmail integration with selectable tone levels ranging from subtle tweaks to curt, typo-laden 'CEO' style, it highlights changes and replaces drafts directly in the compose window. It is built for outbound communication where polished corporate copy gets ignored and hurried authenticity gets replies.

What it's for

  • Rewrite polished cold outreach emails to sound informal and personal
  • Mimic hurried, short-form executive writing styles using the CEO mode
  • Replace overly formal drafts directly inside the Gmail compose window
  • Test whether casual email phrasing increases outbound response rates

Features

  • Gmail compose window integration
  • Tone slider offering Subtle, Human, and CEO modes
  • Intentional insertion of natural phrasing, brevity, and realistic typos
  • Visual diff highlighting changes made to the draft
  • One-click draft replacement button

Pricing

Freemium. Free to try on the web app; additional usage details unlisted

Details

Type
Web app
Category
Productivity
Topic
Email Assistants
Open source
No
Platforms
Web, Browser extension
For
Cold emailers, founders, and professionals trying to avoid sounding automated or corporate
Alternative to
Grammarly
Tags
email, gmail, writing, ai writing, copywriting, cold email

Why it was saved

  • @horwitzben, 23 April 2026: A real, working browser extension-style product with a funny premise and a live domain worth visiting; also a reference for how the demo and in-compose UX are presented.

Related

Updated