# Sinceerly

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

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.

Website: https://sinceerly.com/

## What it is 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](https://xiry.app/topics/productivity.md)
- 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](https://x.com/horwitzben/status/2047293550342152680): 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

- [Superhuman](https://xiry.app/resources/superhuman): AI productivity suite combining fast email, collaborative docs, and writing assistance (Web app, Paid)
- [AudioPen](https://xiry.app/resources/audiopen): Converts spoken thoughts into structured, polished writing in customizable styles. (Web app, Freemium)
- [ProWritingAid](https://xiry.app/resources/prowritingaid): Grammar checking, style editing, and story development toolkit for writers (Web app, Freemium)
- [540 Badass Bullet Points for Your Resume (e-book)](https://xiry.app/resources/540-badass-bullet-points-for-your-resume-e-book): Curated collection of pre-written resume bullet points and action verbs. (Article or course, Paid)
- [Amazon Writing Guidelines Cheat Sheet](https://xiry.app/resources/amazon-writing-guidelines-cheat-sheet): Rules for concise, data-driven business memos based on Amazon's internal standards. (Framework, Free)
- [NetworkAI by Wonsulting](https://xiry.app/resources/networkai-by-wonsulting): AI generator for personalized LinkedIn outreach notes and recruiter cold emails (Web app, Freemium)

Updated 10 October 2026. Page: https://xiry.app/resources/sinceerly

Make your own library: Xiry takes your saved reels, tweets, Reddit bookmarks and Watch Later videos, makes them searchable and pulls the useful stuff out, like this library. It's invite-only for now; join the waitlist at https://xiry.app/#waitlist.