ShroomPen is a privacy-first browser writing assistant that lets you instantly reply, rewrite, fix grammar, or translate text across any website without sending sensitive data to the cloud. Designed to balance AI convenience with absolute data privacy, it keeps all your page, field, tab, and session context securely on your device, giving you complete control over your everyday web workflow.
Like many developers, I found myself constantly frustrated by the privacy trade-offs of modern AI writing tools. Every time I wanted a quick rewrite, grammar fix, or translation in the browser, I had to send sensitive webpage content, form data, and personal context to third-party cloud servers.
I built ShroomPen to solve that exact problem: bringing the seamless convenience of an AI writing assistant directly to the browser while keeping 100% of the data local and private on the user's device.
As I worked on the launch, my approach evolved from trying to build a heavy, feature-bloated extension to focusing tightly on a lightweight, context-aware utility. I realized that users don't want another complex app dashboard - they just want instant, secure help right inside the text fields they're already using, without ever having to worry about where their data is going.
"privacy-first" and "browser extension that rewrites text on any site" don't usually go together, most of these ship your selection to an API somewhere. is the model actually running locally in the extension, or is "privacy-first" here meaning no logging/retention on your servers rather than no network call at all? that distinction matters a lot for anyone pasting client emails into the rewrite box.
When someone is deciding between ShroomPen and Grammarly/LanguageTool, what are the 2–3 workflow moments where ShroomPen clearly wins—and where do you still expect Grammarly/LanguageTool to be better today?
Everyday use I could see myself reaching for this when I’ve written something that technically makes sense but sounds awkward. Being able to fix it right there without opening another tool feels genuinely convenient.
About ShroomPen on Product Hunt
“Reply, rewrite, fix grammar, translate with single extension”
ShroomPen launched on Product Hunt on September 25th, 2026 and earned 103 upvotes and 16 comments, placing #11 on the daily leaderboard. ShroomPen is a privacy-first browser writing assistant that lets you instantly reply, rewrite, fix grammar, or translate text across any website without sending sensitive data to the cloud. Designed to balance AI convenience with absolute data privacy, it keeps all your page, field, tab, and session context securely on your device, giving you complete control over your everyday web workflow.
ShroomPen was featured in Productivity (661.6k followers), Writing (59.4k followers) and Privacy (11.3k followers) on Product Hunt. Together, these topics include over 185.6k products, making this a competitive space to launch in.
Who hunted ShroomPen?
ShroomPen was hunted by Ivan Balshalapau. 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.
Want to see how ShroomPen stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Ivan Balshalapau
Like many developers, I found myself constantly frustrated by the privacy trade-offs of modern AI writing tools. Every time I wanted a quick rewrite, grammar fix, or translation in the browser, I had to send sensitive webpage content, form data, and personal context to third-party cloud servers.
I built ShroomPen to solve that exact problem: bringing the seamless convenience of an AI writing assistant directly to the browser while keeping 100% of the data local and private on the user's device.
As I worked on the launch, my approach evolved from trying to build a heavy, feature-bloated extension to focusing tightly on a lightweight, context-aware utility. I realized that users don't want another complex app dashboard - they just want instant, secure help right inside the text fields they're already using, without ever having to worry about where their data is going.