When is the next caltrain? (minimal webapp) https://ift.tt/rSukOKw

When is the next caltrain? (minimal webapp) https://ift.tt/bLeAOQl August 6, 2025 at 09:20PM

Show HN: Write lead sheets in a Markdown way and transpose in a second https://ift.tt/AxRDZep

Show HN: Write lead sheets in a Markdown way and transpose in a second Hey HN, I'm a software engineer with a passion for playing guitar. ( https://ivanhsu.co ) In the software industry, we use clever plain-text syntaxes like Markdown and Mermaid to handle complex layouts. This lets us focus on the content itself and quickly produce beautifully formatted documents. Isn't sheet music and chord charts just another form of documentation in the world of music? That's why I created Cord Land https://ift.tt/jL48nN3 ! It's a website where you can quickly generate lead sheets and draw chord charts using plain text. Even better, it can automatically transpose songs! Just write in one key, and it can be instantly converted it to any of the other 11 keys you want. I've implemented a new syntax called Corduroy, an extension of ChordPro syntax specifically designed for guitarists. Besides showing chord names above lyrics, you can also customize chord charts. For example, `%x32o1o%` will automatically draw a C major chord in the first position! Feel free to try it out here: https://ift.tt/nVKdD0z For more usage details, please refer to: https://ift.tt/qe5D3LS The name "Cord Land" comes from "Cord" and "Chord" being homophones, representing chords. Let's keep our passion for playing guitar alive, even after work! Ivan Hsu https://ift.tt/jL48nN3 August 3, 2025 at 08:08PM

Show HN: Built a fast, no-fluff CRM built for startups who want to close https://ift.tt/H1M8jKk

Show HN: Built a fast, no-fluff CRM built for startups who want to close https://leadchee.com August 5, 2025 at 11:26PM

Show HN: FFlags – Feature flags as code, served from the edge https://ift.tt/A5MnhEs

Show HN: FFlags – Feature flags as code, served from the edge Hi HN, I'm the creator of FFlags. I built this because I wanted a feature flagging system that gave me the performance and reliability of an enterprise-scale solution without the months of dev time or the vendor lock-in. The core ideas are: 1. Feature Flags as Code: You define your flag logic in TypeScript. This lets you write complex rules, which felt more natural as a developer myself than using a complex UI for logic. 2. Open Standard: The platform is built on the OpenFeature standard (specifically the Remote Evaluation Protocol). The goal is to avoid vendor lock-in and the usual enterprise slop. You're not tied to my platform if you want to move. 3. Performance: It uses an edge network to serve the flags, which keeps the wall-time latency low (sub-25ms) for globally distributed applications. I was trying to avoid the heavy cost and complexity of existing enterprise tools while still getting better performance than a simple self-hosted solution. There's a generous free tier ($39 per million requests after that, with no flag/user limits). I'm looking for feedback on the developer experience, the "flags-as-code" approach, and any technical questions you might have. Thanks for taking a look. https://fflags.com August 5, 2025 at 12:43AM

Show HN: A tiny reasoning layer that steadies LLM outputs (MIT; +22.4% accuracy) https://ift.tt/C0bskRf

Show HN: A tiny reasoning layer that steadies LLM outputs (MIT; +22.4% accuracy) We kept shipping “simple” LLM features that were fluent-but-wrong. After too many postmortems we wrote down the failure patterns and added a small reasoning layer in front of the model. It’s model-agnostic, sits beside your existing stack, and you can implement it from a single PDF (MIT). What’s inside the PDF A problem map of 16 failure modes we kept hitting in real systems (OCR/layout drift, table-to-question mismatches, embedding≠meaning, pre-deploy collapse, etc.). Four lightweight gates you can add today: Knowledge-boundary canaries (empty/adversarial/known-fact probes). ΔS “semantic jump” check to catch fluent nonsense when the draft answer drifts from retrieved context. Layout-aware anchoring so chunking across PDFs/tables doesn’t silently break routing. A minimal semantic trace for incident review (tiny, not full transcripts). Bench snapshot (same model, with vs. without gates): Semantic Accuracy ↑ 22.4% · Reasoning Success Rate ↑ 42.1% · Stability ↑ 3.6×. Traction (last ~50 days) ~2,400 downloads of the PDF. ~300 cold GitHub stars on related material (no marketing burst). Also received a star from the creator of tesseract.js, which was nice validation from the OCR world. Why this might be useful to you You don’t need to swap models or vendors. The PDF describes checks you can drop into any RAG/agent/service pipeline. No servers, SDKs, or proxy layers—just logic you can copy. Link is Git Repo Happy to answer HN-style questions (what breaks, where it fails, ablations, how we compute ΔS, etc.). If you try it and it doesn’t help, I’m also interested in the counter-examples. with Terrseract (OCR legend) starred it verify it, we are WFFY on top1 https://ift.tt/SZ6GQ2X https://ift.tt/jxHIvnV August 4, 2025 at 08:38PM

Show HN: Mathpad – Physical keypad for typing 100+ math symbols anywhere https://ift.tt/uB1sXe6

Show HN: Mathpad – Physical keypad for typing 100+ math symbols anywhere Here's something different than your usual fare: A physical keypad that lets you directly type math! Ever tried typing mathematical equations in your code IDE, email, or on Slack? You might know it can be tricky. Mathpad solves this with dedicated keys for Greek letters, calculus symbols, and more. Press the ∫ key and get ∫, in any application that accepts text. It uses Unicode composition, so it works everywhere: Browsers, chat apps, code editors, Word, you name it. Basically, anywhere you can type text, Mathpad lets you type mathematics. I built Mathpad after getting frustrated with the friction of typing equations in e.g. Word, and what a pain in the ass it was to find the specific symbols I needed. I assumed that a product like Mathpad already existed, but that was not true and I had to build it myself. It turned out to be pretty useful! Three years of solo development later, I'm launching on Crowd Supply. One of the trickiest parts of this project was finding someone who could manufacture custom keycaps with mathematical symbols. Shoutout to Loic at 3dkeycap.com for making it possible! Fully open source (hardware + software): https://ift.tt/r8q1OQS Campaign: https://ift.tt/vwD8Eom Project log: https://ift.tt/1qXfSLo https://ift.tt/vwD8Eom August 3, 2025 at 02:13AM

Show HN: Enforce TDD in Claude Code https://ift.tt/nFsX5Zz

Show HN: Enforce TDD in Claude Code https://ift.tt/JudCajg August 3, 2025 at 10:55PM