Show HN: An open-source, RL-native observability framework we've been missing https://bit.ly/46ZKs6V

Show HN: An open-source, RL-native observability framework we've been missing The RL ecosystem is maturing— verifiers are standardizing how we build and share environments. However, as it grows, we need observability tooling that actually understands RL primitives. Running RL experiments without visibility into rollout quality, reward distributions, or failure modes is a waste of time. Monitor provides live tracking, per-example inspection, and programmatic access—see what's happening during runs and debug what went wrong afterward. The future of RL observability could look like this: You’re working alongside your model, spawning multiple versions of your environment by tweaking components at different points, much like using git worktrees for RL experiments. https://bit.ly/42YamGV October 6, 2025 at 09:36PM

Show HN: FileCache – A simple async/await based URL file caching tool for Swift https://bit.ly/3WozkeP

Show HN: FileCache – A simple async/await based URL file caching tool for Swift https://bit.ly/4mNTj1l October 6, 2025 at 07:00PM

Show HN: Meihus – Mortgage calculator that shows early payment impact monthly https://bit.ly/48cCrxK

Show HN: Meihus – Mortgage calculator that shows early payment impact monthly I built it because I needed a way to see how much will my early payments save in interest overtime. Most of the websites I found are solely made for the US, which does not help my case. So I built one that has a bit more flexibility in terms of loan data. Any feedback is appreciated. https://bit.ly/48hzD2u October 6, 2025 at 07:30AM

Show HN: A Node.js CLI tool to generate ai.txt, llms.txt, robots.txt, humans.txt https://bit.ly/46D3hxN

Show HN: A Node.js CLI tool to generate ai.txt, llms.txt, robots.txt, humans.txt https://bit.ly/46REXqJ October 6, 2025 at 04:58AM

Show HN: High-fidelity, compact, and real time rendering of university campus https://bit.ly/46MUgm5

Show HN: High-fidelity, compact, and real time rendering of university campus Technical thread: https://bit.ly/48N5hF4 https://bit.ly/4pTNDpm October 6, 2025 at 12:51AM

Show HN: Calcetra – an interactive geometry explorer for math visualization https://bit.ly/4o54eEP

Show HN: Calcetra – an interactive geometry explorer for math visualization https://bit.ly/4h6H7HR October 5, 2025 at 12:52PM

Show HN: URI-Transformer: AI architecture that models meaning. 99.9% less memory https://bit.ly/3KsTsdl

Show HN: URI-Transformer: AI architecture that models meaning. 99.9% less memory An AI architecture that models meaning, not just patterns. 99.9% less memory. https://bit.ly/46Uixp0 October 5, 2025 at 04:11AM

Show HN: An open-source, RL-native observability framework we've been missing https://bit.ly/3Kt8EqV

Show HN: An open-source, RL-native observability framework we've been missing The RL ecosystem is maturing— verifiers are standardizing how we build and share environments. However, as it grows, we need observability tooling that actually understands RL primitives. Running RL experiments without visibility into rollout quality, reward distributions, or failure modes is a waste of time. Monitor provides live tracking, per-example inspection, and programmatic access—see what's happening during runs and debug what went wrong afterward. https://bit.ly/42YamGV October 4, 2025 at 10:35PM

Show HN: World Amazing Framework: Like Django for Civilization https://bit.ly/42rIrPw

Show HN: World Amazing Framework: Like Django for Civilization Any initial thoughts? This framework is meant to be a tool for construction, so if you want to play around with it for creating potential specific implementations, you can drop the contents of the website, the GitHub README, and the entire overview.md into an AI chat, and that should be enough to use the framework, at least conceptually. Would y'all want me to pre-prime a chat in Google AI Studio with the full context of the plan and some basic direction for discourse? I can share a link to a ready-to-go environment. The core documentation should answer most mechanical questions. And if you feed the docs into an AI chat, you can ask it any question you may have, or to simply ask it to explain something in different ways, or hypothesize solutions to any world issue, either systemic or regional. Gemini Pro 2.5 can take the full doc in one prompt, and its ability to co-create ideas is remarkable. I've been using it mostly through the AI Studio interface. Much of the overview is as much my work as it is a synthesis of my collaboration with Gemini Pro 2.5, ChatGPT-4o, and some early contributions from GPT-4 about a year ago. Before LLMs, I was building out pamphlet-style pages on a website (that are up at whomanatee.org, which is the base wrapper implementation of the framework), and I was planning to use them as talking points. I was anticipating that much of the deep thinking would have to happen in slow, public discourse. With LLMs, I've been able to stress-test these ideas from every possible angle, using any past event or theory to see if the framework could withstand scrutiny. At one point, a model argued that Adam Smith would have rejected this idea as fantasy. So I worked with it to develop an economic plan that "synthetic Adam" praised. It's incredible that we now have the ability to get synthesized thoughts from almost any perspective. You could ask it, "What would Barack Obama think of this plan? And using the framework, what would be your response to any hesitations he may have?" And it responds with incredible analysis, synthesis, and feedback. https://bit.ly/3VLR8Au October 4, 2025 at 11:14PM

Show HN: Magic-markers – control a smart bulb with crayola markers https://bit.ly/4mQ7ALc

Show HN: Magic-markers – control a smart bulb with crayola markers i made this for my niece for her 3rd birthday. it was inspired by this reel: https://bit.ly/4mPvnL0... . the main difference (i believe) is that this is entirely self-contained and does not require integrating with a smart home system. the bulb connects directly to a wifi network on the nanoc6, and the nanoc6 posts commands directly to the tasmota command endpoint on the smart bulb. this was a lot of fun to build :) https://bit.ly/4nsMNhI September 30, 2025 at 01:03PM

Show HN: RenderarXiv – Search ArXiv from terminal, HTML to read/paste into LLM https://bit.ly/48gfjyw

Show HN: RenderarXiv – Search ArXiv from terminal, HTML to read/paste into LLM Terminal tool to search arXiv papers and render them as beautiful HTML for humans and LLMs https://bit.ly/4mM9X1e October 4, 2025 at 01:33AM

Show HN: Neural Emotion Matrix for NPCs https://bit.ly/4n7FUlb

Show HN: Neural Emotion Matrix for NPCs Hey! I built this system to humanize NPCs by giving them emotions using Rust and ML. The system provides emotion coordinates (based on Russell's circumplex model) from text input or actions, with persistent emotional memory per entity. Think NPCs that remember how they feel about specific players or events. I pre-trained a DistilBERT model on ~1k video game dialogues (Skyrim, Cyberpunk, etc.) and plan to extract and evaluate 100k+ dialogues soon. However studio/team can manually add dialogues to enrich their own dataset. The matrix doesn't generate dialogue, it only analyzes content. When you pass text or an action, it returns emotion coordinates on the valence (pleasant/unpleasant) and arousal(energetic/calm) scale. For example: - [0.00, 0.00] = neutral - [0.29, 0.80] = excited - [-0.50, -0.30] = sad/tired I made a quick visualizer here to help understand https://bit.ly/3WnQZmU The system helps select which dialogue/action to play based on emotional state: - Player says something bad to NPC → system detects negative valence → game picks from "angry dialogue pool" - NPC remembers past positive interactions → system returns positive valence → friendlier responses available So, the devs still write the dialogues or choose the next actions, but the matrix helps manage NPC emotional states and memory dynamically. Here's the project structure to better understand how it works: - src/config: Helper utilities for NPC configuration setup - src/module: The core engine with emotion prediction, memory storage, and entity management - src/api: FFI layer with pub extern "C" to bridge our modules with C/C++ game engines and modding tools (Unity, Unreal, etc.) To implement it, just call `build.sh`, it will create DLL files that you can use to call the matrix functions directly in C++/C/C#. I'd love feedback on code quality and overall architecture. Feel free to be honest about the good, the bad, and the ugly. PRs welcome if you want to contribute! https://bit.ly/48OIRmR September 29, 2025 at 02:05PM

Show HN: BetterBrain – Dementia prevention, covered by insurance https://bit.ly/4gSyznT

Show HN: BetterBrain – Dementia prevention, covered by insurance Hey all! I’ve been building BetterBrain for the past few months, which is the first dementia prevention program entirely covered by insurance. BetterBrain combines expert clinicians, comprehensive testing and state of the art AI - and for many insurance plans is $0. Research shows that dementia can be detected up to 20 years in advance. Despite this, many people at risk of dementia overlook regular brain health assessments. Many members of our founding team have family members affected by neurodegenerative disease. We’re also hiring aggressively if anyone is interested in changing the future of treating neurodegenerative disease. Would love to talk to anyone interested https://bit.ly/4h36biX https://bit.ly/4h36biX October 3, 2025 at 03:03AM

Show HN: Uber for Flights https://bit.ly/4pScw4P

Show HN: Uber for Flights My friend and I built BookMyFlight to finally modernize flight search + booking. Why we built this: - Personalization. I fly the same route every month, and there’s no platform that knows my preferences so that I can open it, find and book my flight, and close it within a minute. - Booking is slow. I hate seeing a long clunky airline form each time I need to book. I want booking a flight to feel more like booking an Uber. How it works: 1. Optionally make an account and save your traveler preferences. Personally, I've specified my routine route as SFO to CLE and that I only want red-eye direct flights for this route. 2. Search for flights using chat or the search panel. Chat feels especially time-saving when you have preferences saved (e.g. I just say “search my routine trip"). 3. Once you find the flight you want, use the one-click book feature which books your flight directly with the airline. The first time you book a flight, you’ll have to fill out your traveler info, but you won't see that form after that. Notes: - Your booking is directly with the airline (this means when something goes wrong, you get direct support from the airline—not a third-party) - You can add your rewards numbers for each airline to keep earning points/status The ultimate goal is to create the best possible experience that every traveler wants, but that OTAs and airlines don’t care to create. Also very receptive to hearing pain points from frequent flyers; we think this space is really outdated and could use some innovation. Try it out and let us know what you think :) https://bit.ly/4pJjclE October 2, 2025 at 08:59PM

Show HN: Silobase – Firebase/Supabase alternative as NPM package https://bit.ly/4gUlgDB

Show HN: Silobase – Firebase/Supabase alternative as NPM package I built Silobase , an open-source backend-as-a-service packaged as an npm module. With just a package.json and a .env file, you can deploy a REST API on top of your own database. https://bit.ly/4pRIoX6 October 2, 2025 at 08:01AM

Show HN: Photo AI Editor – Edit, Transform and Enhance Photos with Text Prompt https://bit.ly/4nTu8LM

Show HN: Photo AI Editor – Edit, Transform and Enhance Photos with Text Prompt https://bit.ly/46MOMq9 October 2, 2025 at 07:49AM

Show HN: Rostra is a P2P (f2f) social network https://bit.ly/3WiPdn3

Show HN: Rostra is a P2P (f2f) social network A public instance is available at https://bit.ly/46MUgRt . It will default to showing the interface from the perspective of my own identity, in a read-only mode. Click "Logout" and then "Random" to generate your own identity to play with. https://bit.ly/3KtlaXf October 1, 2025 at 11:10PM

Show HN: ChartDB Agent – Cursor for DB schema design https://bit.ly/3VGI9R5

Show HN: ChartDB Agent – Cursor for DB schema design Last year we launched ChartDB OSS ( https://bit.ly/3JjJ4UG ) - an open-source tool that generates ER diagrams from your database (via query/sql/dbml) without needing direct DB access. Now we’re launching the ChartDB Agent. It helps you design databases from scratch or make schema changes with natural language. You can: - Generate schemas by simply describing them in plain English - Brainstorm new tables, columns, and relationships with AI - Iterate visually in a diagram (ERD) - Deterministically export SQL script Try it out here - https://bit.ly/3Kx7Z7C - no signup required. Or sign up and use it on your own database Would love to get your feedback :) https://bit.ly/48I7XDW October 1, 2025 at 02:38PM

Show HN: I made a website you can only visit in airplane mode https://bit.ly/4nFGc3B

Show HN: I made a website you can only visit in airplane mode I made a little website you can only visit when your phone is in airplane mode. Enjoy that short moment of disconnection. https://bit.ly/4mPCS4J September 30, 2025 at 08:41PM

Show HN: I made an open-source web engine for relativistic simulations https://bit.ly/48b9IJE

Show HN: I made an open-source web engine for relativistic simulations Dedicated to the brave men and women who gave their lives so we could begin again. https://bit.ly/3IP3B3g October 1, 2025 at 09:19AM