It's literally a single .swift file. Ask your LLM to audit it.

Are you serious? It's open source. And there's less than 1000 lines total. Get Codex or Claude to review it if you're paranoid.

While I disagree with you, thank you for sharing your decision-making process: you're probably not the only one who thinks this way.

In general, would you pay for a notorised build of free software, if you had use for that software, even if an un-notorised build or the source code were available?

Notarization is mostly a glorified malware scan. There's no Apple engineer auditing what's being sent for notarization. Even clever malware can evade notarization scans and be distributed as a notarized binary, it has happened in the past [0]

There's no better way for auditing such an app than having the code easily available and looking through it, and compiling it yourself. Which is already the case here.

[0] https://thehackernews.com/2025/12/new-macsync-macos-stealer-...

A codebase search for "claude" only has 1 hit in the code (the markdown that you referenced) and 4 commits which include the word in the commit message, or one commit includes .claude/ in the git ignore. See https://github.com/search?q=repo%3Atldev%2Fposturr+claude&ty...

Same with a codebase search for "anthropic"

Hi - this is the author. I can explain that, ha!

Right now I'm using a vision library to detect head height which was good enough. I went down a tangent where I hooked it up to my Claude Code instance to take a screen shot and have Claude Code assess how bad my slouch was. Claude would watch a folder for screen shots, read it in, and if it detected bad posture, write to a file the program was watching to adjust blur.

I did this weird work-around so I could use my Claude Code subscription as opposed to the API.

Anyways, it was too slow and Claude was a bad judge of slouchiness. Head height works well enough!

I'll clean this up.

do any more open applications like this exist? The idea seems great

If you assume a person’s chair height and desk height are both set optimally, then I guess the person’s height doesn’t matter for this detection.

if im not sitting on my right foot with left knee under my chin my thinking takes a hit, but i also have to constantly switch how im sitting so i dont get annoyed. its hard not to slouch/melt into whatever im sitting on and i think the only way to offset all that is the gym.

Sure, but getting the right environment is a prerequisite. In my case it’s a Herman Miller Embody chair [1] that stops me getting into a bad position (it’s not impossible, it just encourages good posture).

[1] https://www.hermanmiller.com/en_gb/products/seating/office-c...

If I’m not wearing my glasses the screen blurs organically.

Doesn't the screen already go blurry when you're not wearing your glasses?

“If only the world had some way to remind be to wear my glasses … like going all blurry or something.”

I get you - but making it absurd is where my brain went immediately. >.<