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Show HN: OnKey – I'm a bad singer, so I built an app to show where I'm off-key I'm not a good singer, but strangely enough I still like singing. I've improved a little over time with singing apps, but their song lists are limited by licensing, so I'd often open a song expecting the original and find a cover I didn't want to sing to. So I built OnKey: a free, open-source (MIT) Mac app that listens to whatever you're playing in Spotify, Apple Music or YouTube, learns the singer's melody, and shows you live where you're sharp or flat, with a score at the end. Nightingale did something similar years ago for your own audio files. OnKey works with the music you already stream. Demo (1:35, sound on): https://singonkey.app The first time you play a song, you can sing along while it listens, or play a whole playlist and let OnKey learn the songs in the background before you come back to sing them. When a song finishes it learns the notes on your Mac (a coup...

Show HN: ULDA – Client-side encryption with a simple JavaScript API Hi there! We have designed client side encrypted storage that sync on multiple devices and allows to hold that data on your server. We have started as chat application in late 2022 that has completly open-readable database. The idea was simple - server holds zero secrets, like non at all. But we ran into the problem of authentication - there were no auth method what could make quick, synced authorization with completely zero secrets. So in early 2023 we came to an idea of authentication via proof of ownership by providing proof that next step is made by the same user. Now you can see our job as ulda core https://ift.tt/60l2RUL . Ulda was called as universal liniar data authentication. But a year later we faced that “None need another extremely secure chat application” and we decided to export our ideas and share ulda as a method in order to gather some feedback from some smarter people. In 2025 we tried to publish o...

Show HN: we made every cloud work like one giant computer https://ift.tt/97Khcx5 October 20, 2026 at 11:46PM

Show HN: Agent Archive – Session Handoffs and Backups for Claude Code and Codex I often switch between Claude Code and Codex throughout the week, and between my laptop and an older machine I leave running at home. I built agent-archive to make it easier to pick up where I left off, especially when i hit usage limits. It lets you (or a coding agent) find past coding sessions and hand their conversation context to another agent. You can try local handoffs without setup, or connect your own S3/R2 bucket for automatic archiving and access from other machines. It also tracks usage across agents and gives you a full archive of your session transcripts across agents, which I've found useful to iterating and improving my AGENTS.md and lint rules. https://ift.tt/ovDb4R7 October 20, 2026 at 10:54PM

Show HN: ECG Signal Processing Starter Kit – Python, SciPy, and FastAPI https://ift.tt/N5SBUVY October 19, 2026 at 09:30PM

Celebrating Our Safe Driver Award Winners By Andrea Buffa Cassandra Griffin, also known as Cable Car Cassandra, is one of our Safe Driver Award winners this year. Being a Muni operator is an important and challenging job. It’s not easy to drive a cable car, streetcar or 40- or 60-foot bus through the streets of San Francisco. Yet, hundreds of operators have stepped up to the plate and get behind the wheel every day. They keep our city moving up and down San Francisco’s iconic hills. They help people get everywhere, including to work, school, the grocery store and the doctor. And of course, Muni is a great way to get to museums, concerts and sporting... Published 2026-10-19T00:00:00Z https://ift.tt/9ZWwPIo