BlogViral

Show HN: I made a tool for learning scales, chords, and how to combine them This started out when I vibe-coded a guitar scale fingering generator. It came out pretty good, and I started adding stuff to it: chords, then how chords and scales interact. Then I added charts for other instruments I mess around with: piano, cello, alto recorder. There's a complexity toggle to go from basic harmony to extended/experimental stuff. It's honestly still mostly a toy, but I thought other people might be interested in playing with it. Source is on github, so it's easy enough to run locally and fork. https://ift.tt/0UXiD6u https://ift.tt/Pz76BEd May 21, 2026 at 12:44AM

Smoother Rides Ahead: Muni Service Changes Start June 6 By Benjamin Barnett Rider feedback helped inform this schedule adjustment to shorten the gap between 5R buses. This fix allows us to reduce crowding without adding buses. Muni is making service changes across San Francisco starting Saturday, June 6, 2026. These changes aim to improve reliability, reduce crowding and make trips more consistent. Changes include: More service where crowding has increased Route and stop changes to improve reliability and service efficiency Updated schedules to reduce delays and improve travel times, customer information and reliability More service where riders need it 5R Fulton... Published 2026-05-20T00:00:00Z https://ift.tt/eaZIN7b

Carnaval SF Is Back May 23-24: Feel the Rhythm and Ride Muni By Danbee Song Carnaval is back this weekend – learn how to join the fun. Photo by  Jayasimha Nuggehalli. Join us Saturday, May 23, 2026 and Sunday, May 24, 2026 for one of the city’s most vibrant cultural celebrations, Carnaval San Francisco. This free, two-day event transforms Harrison Street between 16th and 24th streets into a lively showcase of music, dance, food, art and cultural pride. We’re proud to sponsor Carnaval SF 2026. We’re here to share the details and how to get there with ease on Muni. Festival highlights Carnaval San Francisco is California’s largest and longest-running multicultural... Published 2026-05-19T00:00:00Z https://ift.tt/G3P8Nxi

Show HN: Haystack – Review the PRs that need human attention Hey HN! We're building Haystack ( https://ift.tt/SWi6AKL ) to help teams deal with the explosion in the number of pull requests that need to be reviewed due to the rise of coding agents. Haystack replaces the GitHub PR review system with a queue that triages each PR before a human has to read any diffs. It looks at the diffs, the codebase, and the coding-agent conversation that produced the PR. Haystack then routes it into one of three buckets: 1. Safe to merge. This means the PR has enough evidence behind it that the team can merge it without another human's review. Some examples: -- A small UI copy change that includes a screenshot showing the final state -- A backend change where the author clearly tested the important paths and ran the changes in a real environment 2. Needs fixes. This means that the PR has bugs or violates a rule in your codebase and therefore the PR needs to be fixed by the author. Some examples...

Show HN: audio.observer – AI-generated songs from current events https://audio.observer/ May 20, 2026 at 12:06AM

Show HN: Cubic Doggo, a Open-Source 12-DOF 4-Legged Robot Based on ROS2 This is a recipe for building intermediate-priced robot dog from scratch with all commercial/3D-printed parts, controlled by Rasp Pi 5 and ROS2 Jazzy. A manually coded walk gait is implemented so far, which can be controlled by a controller to move forward or change directions. It does not yet have an IMU required for RL training; however, I believe it's one of the simplest design out there available for multiple development paths. https://ift.tt/OjcpT8K May 19, 2026 at 12:20AM