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Show HN: Remove water from speaker using specific frequency

https://speakercleaner.org/
1•artiomyak•1m ago•0 comments

Vercel Accquired Nuxt

https://vercel.com/blog/nuxtlabs-joins-vercel
1•carlual•8m ago•1 comments

Lump of labour fallacy

https://en.wikipedia.org/wiki/Lump_of_labour_fallacy
1•mfiguiere•15m ago•0 comments

The Sequoia Investor Whose Anti-Mamdani Posts Set Off a Silicon Valley Storm

https://www.wsj.com/tech/the-sequoia-investor-whose-anti-mamdani-posts-set-off-a-silicon-valley-storm-56965cdf
2•KnuthIsGod•15m ago•1 comments

The Dark Side of Apple Development

https://www.magiclasso.co/insights/apple-development/
1•ustad•17m ago•0 comments

Psilocybin treatment extends cellular lifespan, improves survival of aged mice

https://www.nature.com/articles/s41514-025-00244-x
1•XzetaU8•22m ago•1 comments

Full event page with photo sharing

https://pixdrop.com
1•yevo_a•29m ago•1 comments

Proving P ≠ NP via Categorical and Graph-Theoretic 3-SAT

https://www.texstr.org/a/naddr1qvzqqqr4gupzqwe6gtf5eu9pgqk334fke8f2ct43ccqe4y2nhetssnypvhge9ce9qqxnzde4xgcrxdfj8qmnvwfc69lg5m
1•vmstabile•31m ago•0 comments

Advancing Protection in Chrome on Android

https://security.googleblog.com/2025/07/advancing-protection-in-chrome-on.html
2•mfrw•31m ago•0 comments

TimescaleDB helped us scale analytics and reporting

https://blog.cloudflare.com/timescaledb-art/
1•arunmu•32m ago•1 comments

Microsoft Music Producer (1996)

https://archive.org/details/microsoft-music-producer_202210
2•CharlesW•35m ago•0 comments

How to stop a bear in big city: Japan issues shoot-to-kill guide

https://www.thetimes.com/world/asia/article/japan-offers-citizens-instructions-on-how-to-kill-a-bear-dpml5msf3
1•petethomas•35m ago•0 comments

Ask HN: What Problem Would You Solve with Unlimited Resources?

3•hedayet•40m ago•6 comments

What Next?

https://www.rxjourney.net/what-next
1•daviddbrainz•41m ago•0 comments

Nginx-micro:Ultra-minimal, statically-linked, multi-architecture Nginx container

https://github.com/johnnyjoy/nginx-micro
1•thunderbong•52m ago•0 comments

Enlightenment as the Great Filter

https://www.aru.ai/essays/great-filter/
2•aru•53m ago•0 comments

TOML v0.9

https://epage.github.io/blog/2025/07/toml-09/
2•Bogdanp•55m ago•0 comments

Pattern-wishcast: enum pattern types in 2025 rust

https://lunnova.dev/articles/pattern-wishcast/
1•nalllar•56m ago•0 comments

Sia X HackerNoon: Inviting Devs to Build the Decentralized Cloud of the Future

https://sia.tech/blog/sia-x-hackernoon-inviting-developers-to-build-the-future-of-decentralized-cloud-storage
1•smooke•1h ago•0 comments

Benchmark for Evaluating Text Embeddings

https://huggingface.co/spaces/embedding-benchmark/RTEB
1•fzliu•1h ago•0 comments

I'm a 16-Year-Old Self-Taught Developer – Built 700 Projects

2•RajGuruYadav•1h ago•0 comments

Comparing the Climate and Productivity Impacts of a Shrinking Population

https://www.nber.org/papers/w33932
3•alphabetatango•1h ago•0 comments

LM Studio is free for use at work

https://lmstudio.ai/blog/free-for-work
2•CharlesW•1h ago•0 comments

Huawei Whistleblower Alleges Pangu AI Model Plagiarized from Qwen and DeepSeek

https://github.com/HW-whistleblower/True-Story-of-Pangu
1•zero_kool•1h ago•1 comments

Myth of the Brown Recluse: Fact, Fear, and Loathing

https://spiders.ucr.edu/myth-brown-recluse-fact-fear-and-loathing
2•indigodaddy•1h ago•2 comments

Jagadish Chandra Bose

https://en.wikipedia.org/wiki/Jagadish_Chandra_Bose
2•Bluestein•1h ago•0 comments

Bash-5.3-Release Available

https://lwn.net/Articles/1029079/
2•ossusermivami•1h ago•0 comments

Quick web stack for vanilla JavaScript

https://www.npmjs.com/package/instaserve
1•throwaway20174•1h ago•0 comments

Mattel unveils first Barbie doll with type 1 diabetes

https://www.yahoo.com/news/mattel-unveils-first-barbie-doll-with-type-1-diabetes-we-knew-the-time-was-right-200026414.html
3•hbcondo714•1h ago•4 comments

Convert JSON –> SQL with a handy web tool

https://widgita.xyz/jsonsql
1•fairlight1337•1h ago•1 comments
Open in hackernews

Show HN: ColdCopy – Generate personalized cold emails with AI

https://coldcopy.xyz
2•ZeeeTH•3h ago
I built ColdCopy because I was spending way too much time writing cold emails that still sounded generic.

The tool generates personalized outreach messages using AI. You fill out a form with your details + recipient info, pick your tone (professional/friendly/direct), and get a tailored email in 30 seconds.

Built with Next.js 14, TypeScript, and OpenAI API. Took about 3 days from idea to launch.

The hardest part was prompt engineering - getting the AI to generate emails that sound human rather than corporate template garbage. I created different prompts for each message type and tone combination.

Currently free to try (3 generations per day) while I gather feedback.

https://coldcopy.xyz

Happy to answer any questions about the build process or get feedback on the approach!

Comments

mattl•3h ago
What's the easiest way to block these?