Show HN: Zero downtime embedding model upgrades https://bit.ly/4ctEEq2

Show HN: Zero downtime embedding model upgrades People use embedding models all the time for rag/semantic retrieval. However, when a newer, more desireable model comes out, there is an expensive (both in time and computational) cost of re-embedding every document in the database. However, I figured out an interesting way to forgo that upfront embedding cost. algo: old model/index -> retrieve top-K docs -> score those docs with the new model -> cache/materialize the new embeddings so instead of rebuilding the entire vector store upfront, the old index keeps getting retrieved from, while the new model reranks those candidates. This works surprisingly well for some model pairs, (i tested 63 source-> target migrations on h100s, on upto 1M documents). For example, on a 1M document Natural Questions dataset, native Qwen3-Embedding-8B: 0.6812 nDCG@10 Qwen3-4B -> Qwen3-8B, K=50: 0.6816 Qwen3-0.6B -> Qwen3-8B, K=50: 0.6638 MiniLM -> Qwen3-8B, K=50: 0.6486 (the hard part is determining k, I held the k constant above to give some sense of migratability). You can install it with pip pip install embedflow and the code is on github https://bit.ly/4zXvTyx https://bit.ly/4zXvTyx September 8, 2026 at 03:35AM

Show HN: Browse 27 years of movie ticket stubs in ThreeJS https://bit.ly/4gVMLNe

Show HN: Browse 27 years of movie ticket stubs in ThreeJS This is one of those projects that's been sitting in the back of my mind for years. I made a ThreeJS UI for browsing (read: re-living) the ticket stubs I've been collecting since I was 9 years old. I was going to create a whole form so that people could share their own collections but landed on just opening up a version you can use to DIY with your agent. That part is here: https://bit.ly/46JQf0y Enjoy! Notes and feedback welcome and appreciated. September 8, 2026 at 12:32AM

Show HN: Golden hour API and a 3D globe of the best light https://bit.ly/4r1NiC3

Show HN: Golden hour API and a 3D globe of the best light https://bit.ly/4r3TERy September 7, 2026 at 05:18AM

Show HN: Lantunnel – a P2P-first private mesh for reaching your LANs https://bit.ly/4cw9s9u

Show HN: Lantunnel – a P2P-first private mesh for reaching your LANs https://bit.ly/4gMZ5iU September 7, 2026 at 04:47AM

Show HN: GET Together – A social network where you don't need POST to Post https://bit.ly/3SAswNb

Show HN: GET Together – A social network where you don't need POST to Post https://bit.ly/4zUnrjD September 7, 2026 at 02:41AM

Show HN: Keen Bean – Mac meeting notes that draft the spec while you talk https://bit.ly/4iaEF5N

Show HN: Keen Bean – Mac meeting notes that draft the spec while you talk https://bit.ly/4gMY769 September 6, 2026 at 10:53AM

Show HN: OpenMonitor – vendor neutral web monitoring cloud agent https://bit.ly/4r2ShCE

Show HN: OpenMonitor – vendor neutral web monitoring cloud agent https://bit.ly/4hbAPIC September 6, 2026 at 01:03AM

Show HN: Cowbull – Wordle-like game where you only get match counts https://bit.ly/4A4lscC

Show HN: Cowbull – Wordle-like game where you only get match counts CowBull is a word game where you have to find the hidden four-letter word. You make guesses and get back the count of exact letter matches (bulls) and partial matches (cows). It’s a bit like Wordle, but you are not told the exact letters which match, only the count of matching letters. Scoring is based on the number of guesses and time used. There is a single player mode and a multi-player mode (no account required). The game source code is at https://bit.ly/4gQELgB . When I was younger, we used to play this game on paper at the back of the classroom during school and college in India. During Covid, I made this online version of the game to play with my kids. https://bit.ly/4xMYAwI September 6, 2026 at 01:37AM

Show HN: I made Blocknado, an orbital stacker. Think Tetris with square rings https://bit.ly/4ym4lRC

Show HN: I made Blocknado, an orbital stacker. Think Tetris with square rings I've loved stacker type games for as long as I can remember. But I've always wanted a version with a bit more strategy and puzzle dynamics. Blocknado is a game I've always wanted to play, maybe others will too. https://bit.ly/3SzxUjE September 6, 2026 at 01:16AM

Show HN: TimerVana a Local-first scheduler for real world routines https://bit.ly/4cNMJ9d

Show HN: TimerVana a Local-first scheduler for real world routines Hi HN, I’m the creator of TimerVana. It's not just "another timer app". The engineering analogy is a lightweight task scheduler for things people do in the real world. A normal timer models one countdown. TimerVana models a small dependency graph in JSON: some steps run sequentially, others run in parallel, and everything can converge on a target finish time. You can also combine multiple timers (e.g., combine a timer with all the steps to cook a steak + a timer for roasting vegetables). I originally built it because I often set multiple timers and alarms when cooking and got tired of repeatedly juggling separate alarms to get a main dish and several sides ready together. The same model also works for workouts, study sessions, morning routines, and other repeatable processes. The iPhone app is local-first by design [0]. You can create, save, and run timers entirely on your phone without an account or cloud sharing. If you want the networked features, the companion website lets you browse and download timers, upload your own, and share them with other people. Everything available today is free. I may eventually add optional AI-assisted timer creation as a paid feature, but I haven’t settled on the business model or pricing. I'm more doing this to solve my own problem and hope it will help others as well. I’m interested in whether the underlying abstraction makes sense: does a sequence of dependent and parallel timed steps help you? I’d also appreciate feedback on the balance I took between the completely local experience and the optional sharing layer (I was partially inspired by the old iOS Workflow App, which was acquired by Apple and is now called Shortcuts). Of course, any other feedback very much appreciated. [0]: https://apple.co/4zXnb3g... https://bit.ly/4xcAWbQ September 4, 2026 at 11:47PM

Show HN: Interactive map of the Japanese address system https://bit.ly/4xbIziG

Show HN: Interactive map of the Japanese address system I had a hard time understanding the Japanese address system. Parts of addresses have suffixes like fu, shi, ku, chōme, ban and gō. Which suffixes are used varies between regions in a way that seemed random to me. I couldn't find a map of the system with a modern visualization, so I made one. It also shows whether an area has a governor or a mayor. For example Tokyo's wards have mayors and Osaka's don't. You can click around or drop the pin to explore, or write an address in the search bar. https://bit.ly/4iLta4P September 4, 2026 at 07:42AM

Show HN: Word42, a wordprocessor inspired by MS Word and Abiword https://bit.ly/461SZGu

Show HN: Word42, a wordprocessor inspired by MS Word and Abiword https://bit.ly/461I7IH September 4, 2026 at 05:39AM

Show HN: Reactor Atlas https://bit.ly/3Vc6aSN

Show HN: Reactor Atlas Hi HN, I'm a nuclear engineer and tech entrepreneur. After working for 3 years in the National Atomic Energy Commision (CNEA) in HPC software for nuclear simulations, I co-founded ratherlabs.com, a software company providing blockchain solutions for startups. Rather Labs business reached ~6 million usd in annual revenue in 2024; now demand is decreasing as our niche clients are using AI to launch their MVPs. Now I'm joining my scientific background with my entrepreneurial inclinations to think of problems related to the energy industry. Nuclear is experiencing a renaissance now (it was in a dark age when I was studying after the Fukushima event) so I think this is the right moment for me to jump again into the field. Reactor atlas is an interactive nuclear reactor map and an intelligence layer on top of it. The basic layer indexes: - power reactors - research reactors - fuel facilities with their history and projection, by country. The project is solving a fragmented information ecosystem, where operational and commercial data is hard to conciliate. Also, I'm monitoring nuclear news associated with each of the facilities, political declarations that may affect the nuclear landscape and geo-phisical news (like earthquakes) that could affect operation. On top of the operational + news layer, I'm creating an intelligence layer that will help institutions of different types make faster decisions by subscribing to very specific alerts. As an engineer, I used to code in fortran and c++ when I was working at CNEA, and later I participated in the first Rather Labs projects architecting complex async systems, mostly using MERN stack. I'm no longer coding anymore. I'm focused on designing robust systems with AI agents. I mainly used Claude Fable 5.1 to develop reactoratlas.com, deploying on vercel and using mostly nextjs, threejs, postgreSQL and some cron jobs to query and update data. I miss coding as in the old days, but I haven't code a single line in this project. And I strongly believe we humans shouldn't code anymore: our responsibility is now on designing and supervising AI systems. Thanks for your attention! https://bit.ly/3US1Vf6 September 3, 2026 at 01:33PM

Show HN: I made a word building game supporting anagrams and one handed use https://bit.ly/4yk2BIL

Show HN: I made a word building game supporting anagrams and one handed use Hi everyone, Wanted to share a game I built. It's called Unscramble! and I believe it's the simplest word building game. Rules: You get a few letters on screen. You need to make one word with all the letters. Tap a letter to select. Tap again to deselect. Faster you go, better you score. If you enter anagrams of the word it's looking for, it gives you extra points. If you are stuck, you can either "Ask Friend" or get Hint. You get extra points for getting the word fast but you don't get penalized for taking too long. I believe the simplicity of the game along with big touch buttons makes it perfect for one handed use. There's 6 difficulty levels in the game, and settings for things like toggling the timer, relaxing background music, sound effects, haptic feedback, removing the background animation. If you want to try: https://apple.co/4yiPgQP... Would love to hear feedback to improve it. September 3, 2026 at 03:37PM

Show HN: The cheapest GPU cloud – H100s at $2.04/HR, H200s at $3/HR https://bit.ly/4qOPIDS

Show HN: The cheapest GPU cloud – H100s at $2.04/HR, H200s at $3/HR https://bit.ly/3TcRgLw September 3, 2026 at 03:50AM

Show HN: Redactle LLM Leaderboard https://bit.ly/4qSxpO3

Show HN: Redactle LLM Leaderboard I got nerd sniped and ran a bunch of evaluations to see how well models could play Redactle. It turns out Gemini flash is in a league of it's own in both performance and cost. It's able to one-shot every eval in a just a few seconds. https://bit.ly/4zXqOq0 September 3, 2026 at 01:11AM

Show HN: Open source ML programming language playground https://bit.ly/4dk3Tez

Show HN: Open source ML programming language playground After joining a ML Study group and trying Google Colab I decided to create my own array programming language to help me learn and visualize machine learning. There are many demo repos using this language which has become more general purpose. Under active development. See github link in footer. Built in Tour, Demos, Tutorials, Glossary, etc. Can use this same UI on a local system to program Apple Silicon, NVIDIA GPUs, or to use Ollama models for context aware help in the REPL. The system architecture is documented in the wiki: https://bit.ly/4xbfGDb https://bit.ly/4yckKIf September 2, 2026 at 11:05PM

Show HN: Markdown Gatekeeper – one current source per topic for AI agents https://bit.ly/46A48hN

Show HN: Markdown Gatekeeper – one current source per topic for AI agents https://bit.ly/3V8pmAQ September 2, 2026 at 03:48AM

Show HN: Gopdfrab – Open-source PDF/A processing for Go https://bit.ly/4gABnpO

Show HN: Gopdfrab – Open-source PDF/A processing for Go https://bit.ly/4h8jDCP September 1, 2026 at 07:34PM

Show HN: Three Pins a daily 3-hole golf game in the browser https://bit.ly/4cWgTH7

Show HN: Three Pins a daily 3-hole golf game in the browser https://bit.ly/4cT7zDU September 1, 2026 at 06:45PM