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Posted by dnw 1/25/2026

A macOS app that blurs your screen when you slouch(github.com)
692 points | 223 commentspage 2
tanelpoder 1/25/2026|
Once launched, Posturr runs in the background and displays a brief "Claude Mode Active" notification.

I haven’t checked the code yet, but what does the “Claude Mode” mean? Is it a poor naming choice? It implies that the local app is somehow connected to Claude (?)

tjohnell 1/25/2026||
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.

tanelpoder 1/25/2026||
Cool, thanks for the clarification. Indeed it's a good and practical idea for a small app. As other comments have said, (some) people might happily pay for this app.

I luckily won't need such feedback loop anymore, had some mild lower back pain show up over 10 years ago and bought a chair without a backrest that, after 3-4 weeks of struggling, trained me to sit up straight. Now I have some random cheap office chair with a backrest, but I rarely lean back to it. Funnily, I was going to give up using that "backrestless" chair after 2 weeks of inconvenience, but decided to give it one more week and then the magic happened :-) Mild lower back pain automatically gone.

hn8726 1/25/2026||
Care to share an example of this backrestless chair? Is it like a regular chair just without the backrest, or has some other differences? Does it have armrests for example, and if not - does it bother you?
tanelpoder 1/25/2026|||
I went with an overkill approach at first (as I often do :-) and bought some expensive nicely designed "active chair" / stool that was adjustable high enough so that I could lean on it even when using my desk as a standing desk. It was interesting, but not a game changer at all for me. I don't use standing desks now at all.

But what I have now is this:

https://www.amazon.com/dp/B002FL3LY4

Just don't assemble the backrest at first. If sitting up straight, I just lean wrists on my keyboard wristpad and part of forearms on the desk, no armrests needed either.

Edit: I still use my height-adjustable standing desk, but now it's value is that I could adjust it for the perfect height for my sitting-up-straight position (so no chair armrests needed) and it's been fixed at that height for the last 7 years...

manuelmoreale 1/25/2026|||
Not sure which one the parent was referring to but personalizing I've been using one of these for more than a decade at this point (I'm sitting on it right now) https://www.varierfurniture.com/en/products

The one I have does have a backrest but because of the way it's shaped you don't actually use it to slouch. It's more there to support when you lean back and want to take a break from typing or something like that.

auslegung 1/25/2026||
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"

russellbeattie 1/25/2026||
That whole "good posture" thing is future physical problems waiting to happen. For 25 years, I've always put my feet up on the corner of my desk (to the left), set the seat as high as possible (or adjust the desk lower) and lean back, arms extended. Basically, I'm positioned like an F1 driver in a cockpit.

No back problems as there's no weight on my spine. No carpal tunnel issues, as my wrists are always flat. No fatigue from holding my body at right angles for hours at a time.

The downside is I look like a total slacker in the office, especially to narrow minded image conscious managers who expect me "to act professionally."

yieldcrv 1/25/2026||
.gitignore > # Claude Code > .claude/

Congratulations! I love seeing people express themselves to release things that were previously not economically viable to prioritize

Forget worrying about a 10x dev, Claude Code with the Opus 4.5 model has turned me into a 100x developer even in software stacks I'm not even familiar with. And with playwright-mcp its completely absolved the need for UX designers in my workflow because I just point playwright-mcp at an already established and A/B tested website for its UX principles. This gives me results far beyond what v0, lovable or Claude Code would come up with on its own.

zsoltkacsandi 1/25/2026||
One thing I learned from my physio: in your spine, everything is connected.

For example, even if you sit perfectly upright, if you have anterior pelvic tilt, it can change the whole dynamics of your spine, that the cervical segment takes a lot of load that it isn't supposed to do.

Or with bad habits you can reprogram your neuromuscular system that it uses the wrong muscles to maintain posture, that can lead a series of problems long term.

If you have back/neck pain or tension that does not resolve in 1-2 weeks, go to a physio.

amelius 1/25/2026||
Why use a proprietary stack for building this when there is a far more capable open ecosystem available at your fingertips?

https://huggingface.co/models?other=human-pose-estimation

https://huggingface.co/models?other=3d-human-mesh-recovery

kazen44 1/25/2026||
do any more open applications like this exist? The idea seems great
JCharante 1/26/2026||
proprietary stack is probably more battery efficient
hk1337 1/25/2026||
This is a really cool idea. I’m a little put off with the idea that my camera is always watching me but the thought behind it is really cool.
cmckn 1/25/2026|
I kind of feel the same way, but I want to try it. I’m pretty sure I have a spare webcam lying around, it could be interesting to have a “trusted” sensor for this app so that I can still keep my main webcam locked down.
lcnmrn 1/25/2026||
Install a pull up bar in your room. It will fix your back better than anything else.
winrid 1/25/2026|
1 min plank in the morning is a big help too
minton 1/25/2026||
Lots of things people might want to monitor for such as nail biting.
iandanforth 1/25/2026||
While this seems to detect posture fairly well, the screen blurring doesn't work for me despite allowing what appear to be the relevant permissions. (macOS 15.1)
wklm 1/25/2026||
I had the exact same issue and have fixed it here: https://github.com/wklm/posturr
tjohnell 1/25/2026||
I added compatibility mode that incorporates the public API. Give it a shot please. I welcome any feedback.
tjohnell 1/25/2026||
I've released 1.0.3 with compatibility mode to use public APIs. The blur isn't as good, but better than nothing!
tjohnell 1/25/2026||
1.0.4 is release with better descriptions.
gcanyon 1/26/2026|
I've now installed this and it's already improved my posture -- thanks! It reminds me of how I now wash my hands for at least twenty seconds every time, because my Apple Watch will annoy me if I stop at even 18 seconds. Little reminders like this are wonderful, and I appreciate you for creating this.

ps -- I added two feature requests and commented on another on the repo.

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