Show HN: Entropy – Sharing screen is scary in SaaS age
21 RazCo 26 5/29/2025, 6:09:22 AM entropysec.io ↗
Sharing screen is really scary today with all PIIs and secrets sprawling around your screen, so I built Entropy, a small Chrome extension that spots API keys, tokens, emails, and throws a blur overlay on them in real time.
The goal is to make screen-sharing feel safe again without adding steps to a demo.
Everything runs locally—regex + entropy heuristics compiled to WASM—and the extra CPU cost averages ~1 ms per mutation on my M1.
Custom rules can be added with a JSON file for teams that have proprietary token formats.
visit https://entropysec.io
Feedback please <3
- I can't tell what this is until I scroll "below the fold" (ie, below the first visible screen). I think your tagline just needs to be clearer. Even your first sentence in the post here could be a decent description ("Entropy, a small Chrome extension that spots API keys, tokens, emails, and throws a blur overlay on them in real time")
- I'm not very comp-sec minded. I've never in my life worried about leaking API keys, tokens, email addresses, etc via screen share. I have worried about leaking bookmarks, sensitive email drafts, slack messages, etc. But I also don't think I care enough to pay for something that blocks those. Hopefully there are people that do care enough to pay
- An idea for a possible pivot: Ad agencies sometimes want to show how much money or traffic they bring in for clients. Made up data isn't convincing to close a sale, but real pages can have sensitive data like company names, logos, ad spend, etc. With a slight pivot, you might be able to provide them something to obscure that info. I only have second-hand knowledge of this problem, so you'd need to verify that they care enough about this -- don't take my word for it.
But personally I like solid bars as it makes it obvious what is happening and that it is secure.
On top of that it uses blur to hide secrets when it has been proven that blurring leaks enough information for the obscured data to be reconstructed.
On top of that it's a $4/mo subscription service for what in your words amounts to regex + entropy heuristics + some enshittification (you're not allowed to have custom regex unless you pay subscription)...
As far as subscriptions go, a lot of devs have moved to a subscription-train model, which I really like: you pay for the subscription (which funds development and pays for support), but at any time you can _stop_ paying the subscription cost and keep the version you're currently running without further updates. That's a good trade-off to me, since I can choose to end my subscription without it becoming a catastrophic migration event that has to be carefully planned and executed fully before opting to stop paying.
Well done!
Having seen a giant work meltdown stemming from a colleague's Slack DM accidentally broadcast over a Zoom call, I'm always paranoid about it.