New Browser Plugin Adds Typos to Your AI-Generated Emails to Make Them Look Real

A venture capitalist used Anthropic’s Claude to build Sinceerly, a browser plugin that injects typos and awkward capitalization into AI-written emails.

The tool offers severity presets like “Subtle” and “CEO,” aiming to make polished AI text look more human.

The trend shows growing demand for ways to evade AI detection by employers and teachers, and to counter tools like Grammarly.

Reports said Sinceerly itself appeared buggy after publication, highlighting the irony of an anti-polish writing tool that wasn’t fully polished.