Hey Product Hunt! I'm Paul, a software engineer from Brazil, and I built Notidem solo as a side project. The idea came from a personal frustration: I'd read genuinely interesting posts on LinkedIn and want to add something meaningful to the conversation — but the friction of writing a thoughtful reply from scratch meant I'd often just scroll past. The result? A feed full of "great post!" and "totally agree" comments that add nothing. Notidem is my answer to that. It's a Chrome extension that reads the post (or message thread) in front of you, combines it with a short profile you write about yourself, and drafts a reply in your voice — specific, human, and relevant. You always edit and post it yourself. It never acts on your behalf. It's free, open-source (MIT), no account needed, and you bring your own AI key — so nothing touches my servers. Happy to answer any questions about how it works, the privacy model, or what's coming next. Thanks for checking it out!

Notidem - the opposite of "idem

Genuine LinkedIn replies in your own voice, via AI

Genuine LinkedIn replies in your own voice, via AI