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Sinceerly
Humanize AI emails inside Gmail compose
Sinceerly is a Chrome extension that rewrites AI-drafted Gmail messages with intentional imperfections, contractions, and tone shifts so they read as human. Three intensity modes: Subtle, Human, and CEO. Free tier, $4.99/mo for unlimited. Built for anyone tired of sending copy that reads like it came from a chatbot.
AI made everyone's inbox sound the same, and now there's a tool that uses AI to fix that.
What it is: Sinceerly is a Chrome extension built by Harvard Business School student Ben Horwitz that runs inside Gmail compose and deliberately introduces imperfections into AI-drafted emails to make them read as human-written.
The loop Horwitz identified is real: people prompt an LLM, copy the output into Gmail, then realize it sounds like every other AI-generated email.
Sinceerly inserts itself at step three.
You click the icon, hit humanize, and yellow highlights show you every change before you approve. The product does not auto-apply anything.
What makes it different: This is not a proofreader or tone adjuster.
The goal is intentional degradation, not improvement.
Three modes reflect different personas: Subtle removes filler and adds minor imperfections, Human adds a conversational feel and one early typo, and CEO drops everything to lowercase with "sent from my iPhone" as the kicker.
It is worth saying plainly that this is a product that helps people obscure AI authorship, and Horwitz does not hide that.
He built it because he was tired of receiving emails that all sounded identical, and the product framing is transparent about what it does.
Key features:
Works inside Gmail compose window natively
Yellow change highlights with one-click approve and replace
Three humanization intensity modes
No email content stored; data processed over HTTPS
Bring your own Anthropic API key option available
Free tier: 3 rewrites; Pro: $4.99/month for unlimited
Benefits:
Cold outreach that reads as written, not generated
Reduces the AI pattern recognition most recipients now have
Review-before-replace workflow means you stay in control of the final text
Who it's for: Founders, sales reps, and individual professionals who draft emails with AI tools and want replies from people who have learned to ignore obviously AI-written messages.
My read: this is a small, sharp tool with one job. The ethical surface area is real and worth thinking about, but the product is honest about what it does. Whether you use it comes down to where you sit on the question of AI disclosure in professional email. What it does technically, it does well.
About Sinceerly on Product Hunt
“Humanize AI emails inside Gmail compose”
Sinceerly was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #152 on the daily leaderboard. Sinceerly is a Chrome extension that rewrites AI-drafted Gmail messages with intentional imperfections, contractions, and tone shifts so they read as human. Three intensity modes: Subtle, Human, and CEO. Free tier, $4.99/mo for unlimited. Built for anyone tired of sending copy that reads like it came from a chatbot.
On the analytics side, Sinceerly competes within Email, Writing and Artificial Intelligence — topics that collectively have 564.4k followers on Product Hunt. The dashboard above tracks how Sinceerly performed against the three products that launched closest to it on the same day.
Who hunted Sinceerly?
Sinceerly was hunted by Raghav Mehra. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Sinceerly including community comment highlights and product details, visit the product overview.
Raghav Mehra
AI made everyone's inbox sound the same, and now there's a tool that uses AI to fix that.
What it is: Sinceerly is a Chrome extension built by Harvard Business School student Ben Horwitz that runs inside Gmail compose and deliberately introduces imperfections into AI-drafted emails to make them read as human-written.
The loop Horwitz identified is real: people prompt an LLM, copy the output into Gmail, then realize it sounds like every other AI-generated email.
Sinceerly inserts itself at step three.
You click the icon, hit humanize, and yellow highlights show you every change before you approve. The product does not auto-apply anything.
What makes it different: This is not a proofreader or tone adjuster.
The goal is intentional degradation, not improvement.
Three modes reflect different personas: Subtle removes filler and adds minor imperfections, Human adds a conversational feel and one early typo, and CEO drops everything to lowercase with "sent from my iPhone" as the kicker.
It is worth saying plainly that this is a product that helps people obscure AI authorship, and Horwitz does not hide that.
He built it because he was tired of receiving emails that all sounded identical, and the product framing is transparent about what it does.
Key features:
Works inside Gmail compose window natively
Yellow change highlights with one-click approve and replace
Three humanization intensity modes
No email content stored; data processed over HTTPS
Bring your own Anthropic API key option available
Free tier: 3 rewrites; Pro: $4.99/month for unlimited
Benefits:
Cold outreach that reads as written, not generated
Reduces the AI pattern recognition most recipients now have
Review-before-replace workflow means you stay in control of the final text
Who it's for: Founders, sales reps, and individual professionals who draft emails with AI tools and want replies from people who have learned to ignore obviously AI-written messages.
My read: this is a small, sharp tool with one job. The ethical surface area is real and worth thinking about, but the product is honest about what it does. Whether you use it comes down to where you sit on the question of AI disclosure in professional email. What it does technically, it does well.