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“Erdos problem #728 was solved more or less autonomously by AI”

https://mathstodon.xyz/@tao/115855840223258103
315•cod1r•6h ago•199 comments

OLED Not for Me

https://nuxx.net/blog/2026/01/09/oled-not-for-me/
9•c0nsumer•54m ago•11 comments

Maine's black market for baby eels

https://www.pressherald.com/2025/09/09/maines-black-market-for-baby-eels-is-spawning-a-crime-thri...
15•noleary•1h ago•2 comments

Flock Hardcoded the Password for America's Surveillance Infrastructure 53 Times

https://nexanet.ai/blog/53-times-flocksafety-hardcoded-the-password-for-americas-surveillance-inf...
346•fuck_flock•11h ago•114 comments

JavaScript Demos in 140 Characters

https://beta.dwitter.net
209•themanmaran•9h ago•48 comments

RTX 5090 and Raspberry Pi: Can it game?

https://scottjg.com/posts/2026-01-08-crappy-computer-showdown/
183•scottjg•9h ago•72 comments

Greenland sharks maintain vision for centuries through DNA repair mechanism

https://phys.org/news/2026-01-eye-greenland-sharks-vision-centuries.html
32•pseudolus•3d ago•4 comments

How Markdown took over the world

https://www.anildash.com/2026/01/09/how-markdown-took-over-the-world/
184•zdw•10h ago•151 comments

Show HN: Rocket Launch and Orbit Simulator

https://www.donutthejedi.com/
108•donutthejedi•9h ago•34 comments

How will the miracle happen today?

https://kk.org/thetechnium/how-will-the-miracle-happen-today/
393•zdw•5d ago•214 comments

Show HN: Scroll Wikipedia like TikTok

https://quack.sdan.io
192•sdan•10h ago•51 comments

Robotopia: A 3D, first-person, talking simulator

https://elbowgreasegames.substack.com/p/introducing-robotopia-a-3d-first
30•psawaya•1d ago•10 comments

Scientists discover oldest poison, on 60k-year-old arrows

https://www.nytimes.com/2026/01/07/science/poison-arrows-south-africa.html
104•noleary•1d ago•36 comments

Cloudflare CEO on the Italy fines

https://twitter.com/eastdakota/status/2009654937303896492
451•sidcool•12h ago•642 comments

Favorite Tech Museums

https://aresluna.org/fav-tech-museums/
22•justincormack•4d ago•12 comments

Show HN: Miditui – a terminal app/UI for MIDI composing, mixing, and playback

https://github.com/minimaxir/miditui
17•minimaxir•1d ago•2 comments

Start your meetings at 5 minutes past

https://philipotoole.com/start-your-meetings-at-5-minutes-past/
36•otoolep•6h ago•57 comments

My article on why AI is great (or terrible) or how to use it

https://matthewrocklin.com/ai-zealotry/
85•akshayka•10h ago•137 comments

The rise and fall of the company behind Reader Rabbit (2018)

https://theoutline.com/post/6293/reader-rabbit-history-the-learning-company-zoombinis-carmen-sand...
10•mmcclure•1d ago•2 comments

Changes to Android Open Source Project

https://source.android.com/
4•TechTechTech•2d ago•1 comments

Kagi releases alpha version of Orion for Linux

https://help.kagi.com/orion/misc/linux-status.html
362•HelloUsername•15h ago•253 comments

Show HN: I made a memory game to teach you to play piano by ear

https://lend-me-your-ears.specr.net
435•vunderba•11h ago•156 comments

Deno has made its PyPI distribution official

https://github.com/denoland/deno/issues/31254
33•zahlman•7h ago•24 comments

Replit (YC W18) Is Hiring

https://jobs.ashbyhq.com/replit
1•amasad•10h ago

Show HN: Yellopages – New tab Chrome extension

https://yellopages.kawaicheung.io/
13•kiwigod17•1d ago•3 comments

QtNat – Open you port with Qt UPnP

http://renaudguezennec.eu/index.php/2026/01/09/qtnat-open-you-port-with-qt/
40•jandeboevrie•8h ago•33 comments

How to store a chess position in 26 bytes (2022)

https://ezzeriesa.notion.site/How-to-store-a-chess-position-in-26-bytes-using-bit-level-magic-df1...
83•kurinikku•13h ago•71 comments

Show HN: Similarity = cosine(your_GitHub_stars, Karpathy) Client-side

https://puzer.github.io/github_recommender/
127•puzer•3d ago•35 comments

Show HN: A website that auctions itself daily

https://www.thedailyauction.com/
26•nsomani•1d ago•8 comments

How to code Claude Code in 200 lines of code

https://www.mihaileric.com/The-Emperor-Has-No-Clothes/
728•nutellalover•1d ago•226 comments
Open in hackernews

Show HN: Free noise evidence generator for tenant complaints

https://noiseevidence.com/
24•countfeng•14h ago
I built a free, no-registration noise evidence generator for tenant noise complaints.

Features: - Supports 27 US cities with accurate noise ordinances - Real-time recording + professional court-ready PDF reports - 100% local processing (no data upload, privacy-first) - Auto day/night noise limit detection - Completely free (10 PDF generations/day)

Why: As a tenant dealing with noise issues, I was frustrated that existing tools either required subscriptions or uploaded data to servers. This tool is: - Totally free, no hidden costs - No registration or installation required - All processing happens locally on your device

Website: https://noiseevidence.com

Feedback welcome!

Comments

alex_duf•14h ago
If I may give constructing feedback then, "noise evidence generator" sounds like you're creating fake noise proof to fool courts. The name needs to be revised.

"recorder" might feel less like it's inventing things.

countfeng•14h ago
Thank you for your suggestion, I will revise it!
supah•12h ago
was my first thought as well.
sigmar•12h ago
"Noise Evidence Logger" perhaps? the 'generator' in the name also made me think this was for faking proof. neat app idea
queenkjuul•5h ago
I 100% thought it was a tool for landlords to do illegal evictions lol
countfeng•1h ago
Adjustments have been made, thank you again! That's a great suggestion!
uoaei•12h ago
How do we know microphones on different devices are calibrated to record the same power readings? Do you have court-ready documents to show this?
xnx•11h ago
I've searched but failed to find anything that works as a standard fiducial-type sound. e.g. With a recording of the sound produced by the fiducial from a set distance (and knowing temperature, pressure, humidity), you could calibrate/adjust recordings.
clifdweller•11h ago
That is the crux you always need a calibrated sound to calibrate the mic. Best I think this app could hope to do is establish a relative reading. perhaps it could play a set of repeatable tones on the device(assuming being executed from a device that does not have external speakers that can be adjusted/ validate that sound was played from phone speaker and not headphone jack to a dac?) and record those then could replay sounds later to a calibrated device to establish reference. or start recording with some other regular repeatable sound like a vacuum cleaner with video showing how it was positioned for recording.
recursive•11h ago
I don't think you can really do that reliably either. Arbitrary consumer device microphones do not have flat frequency response
countfeng•1h ago
I've added a calibration feature, hoping it will improve and help.
waffletower•12h ago
More justification for my mortgage for my well-insulated, single family home with air and distance from my neighbors. Me and my subwoofers escape litigation facilitated by this SaaS.
juancn•11h ago
How do you calibrate?

I mean, the sensitivity of the microphones varies a lot.

Legal proof needs a metrological chain of trust.

countfeng•2h ago
Understood, thank you for your feedback.
A_Duck•11h ago
Congratulations on building a nice-looking app that addresses a legitimate need.

I'd like to see some proof that this is able to accurately measure noise level across a range of devices. The CDC have a sound meter app [1] which has been tested to 2db accuracy, and they only make that available on specific Apple devices because calculating noise level depends on the hardware.

I'm sorry to ask, but I'm seeing many cases of AI apps making accuracy claims based on the author’s ‘reasonableness spot checks’ but with no statistical testing that the outputs are accurate.

[1] https://www.cdc.gov/niosh/noise/about/app.html

A_Duck•11h ago
In my own reasonableness spot check, what measures as 37dB on my phone is showing as 49dB on my laptop
countfeng•1h ago
A calibration function has been added; hopefully this will help.
countfeng•2h ago
Thank you for your feedback. I will adjust the accuracy settings immediately.
rafram•11h ago
I'm guessing you vibe-coded this and let the model hallucinate the decibel thresholds? I randomly googled a couple (Philly and Fort Worth) and the limits shown in the UI don't match up with any law I could find. Philly doesn't have a specific decibel threshold (the law is based on decibels above standard background noise) and Fort Worth's is 70 / 60, not 60 / 55, with higher limits in non-residential areas.

So it's safe to assume that most of the other limits hardcoded in the tool are wrong as well. Pretty irresponsible to release this without even taking the few minutes to research the laws yourself.

A few more concerning claims:

- "US One-Party Consent": This is not a thing, it varies by jurisdiction. Many states are two-party consent.

- "Standards database updated quarterly from public records": It would not appear that way!

- "Not Legal Advice": You are giving legal advice, and it's incorrect.

lm28469•11h ago
> let the model hallucinate the decibel thresholds?

Does it even matter ? Unless you're using calibrated hardware the measured dB will be "hallucinated" too

rafram•10h ago
Yeah, there's that too. But it's especially bad to mislead people about what their local laws say!
sointeresting•8h ago
IANAL but I don't think you can invoke the two party consent laws regarding noises loud enough to be disruptive to other people through walls and such. The recording consent laws typically apply to things like phone calls I believe.
countfeng•2h ago
Thank you for your feedback. I will verify it immediately and make adjustments accordingly.
countfeng•2h ago
所有分贝阈值是找的当地公开使用的官方标准来使用的
renewiltord•11h ago
The NIOSH app on my iPhone matches the calibrated meter I have so it’s feasible. However the app has the appearance of vibecoding. The proof of the pudding is in the eating so that doesn’t matter if it works. Have you tried using it?
countfeng•1h ago
A calibration function has been added; hopefully it will be helpful.
sointeresting•9h ago
Cool idea but from personal experience it's probably not worth much. I'm lucky enough to live on the top floor apartment and I've had multiple issues with multiple neighbors over the years. Maybe the leasing office where I live is worse than others, but they basically just ignore complaints.

I came home from a holiday a few years ago and woke up to a dog howling at 7:00am. This was new. This new dog (a husky, lol) would completely lose it's mind any time the owner, my downstairs neighbor, would leave it alone for any amount of time. Like the moment he shut the door. I work from home so it was difficult to focus while this dog would scream it's lungs out for hours at a time during the day. I complained to the office and left a note on the neighbor's door and got no response from either. After a few weeks I decided to handle it, stayed up to 3:00am, walked into my bedroom (directly above his bedroom) and jumped up and down as hard as I could for as long as I could. I bruised my heel on the floor but in the morning there was no barking and it stopped completely, which means it could have ended any time, they just didn't care. I have several other stories that all ended more or less the same way. No one gives a fuck until they are personally affected. You must fight fire with fire.