Show HN: Music visualizers that react to audio in real time https://ift.tt/EWsTObm

Show HN: Music visualizers that react to audio in real time https://vizz.fm/app/ May 12, 2026 at 01:49AM

Show HN: Java/Spring Boot Idempotency Library https://ift.tt/J4Hk5jM

Show HN: Java/Spring Boot Idempotency Library Idempotency4j is a Java idempotency library with pluggable storage backends and Spring Web / Spring Boot support. This library solves the problem of ensuring that sensitive endpoints do not trigger side-effects multiple times - this is especially useful for any endpoints that handle financial operations. Currently, the library supports Spring MVC (Servlet-based) applications and MySQL and PostgreSQL with jdbc regarding storage backends. It is very simple to integrate, all that you have to do is add @Idempotent to any endpoints that need idempotency. Full explanation of the functionalities and configuration is available in the readme of the repository. Repository : https://ift.tt/1I56pQj I would love any feedback or review regarding the implementation - also, any recommendation is welcome. https://ift.tt/1I56pQj May 11, 2026 at 10:23PM

Show HN: Affordable Survey Software https://ift.tt/RB4zcUt

Show HN: Affordable Survey Software Hi, I built Survser as a more affordable survey / user research solution because I found existing tools to be bloated and unnecessarily expensive. Hope someone finds it useful. https://ift.tt/aPlpDXh May 11, 2026 at 11:23PM

Show HN: I built Tokenyst to stop getting shocked by Claude Code API bills https://ift.tt/lAPBpwO

Show HN: I built Tokenyst to stop getting shocked by Claude Code API bills https://ift.tt/bBwtz2Y May 11, 2026 at 04:12AM

Show HN: AI Agents in 30 Lines of YAML: Lowdefy v5.3 https://ift.tt/4TFKeaX

Show HN: AI Agents in 30 Lines of YAML: Lowdefy v5.3 https://ift.tt/luNMfYJ May 11, 2026 at 12:29AM

Show HN: An addictive phone game about phone addiction https://ift.tt/9fyPDHz

Show HN: An addictive phone game about phone addiction I recently prototyped a web game for a nonprofit to highlight the dangers of phone addiction, but unfortunately I ended up making a really addictive game instead. :-\ I'm sharing this here mainly to serve as an indicator of what can be achieved early-2026 by a senior dev working with Opus 4.7 over 2 days using genuinely collaborative prompting. (ie plan->feedback->iterate) Hope it provides some inspiration or entertainment - there's a level editor too - maybe Hacker Newsers could share their favourite creations here? PS: If there's enough demand I'm happy to Open Source this (or DM me) - it's mainly just time restrictions at my end. https://ift.tt/jPsZLFu May 10, 2026 at 11:39PM

Show HN: All 55,256 Slides of the WAR.GOV/UFO Files Searchable and Linkable https://ift.tt/VoJOKdy

Show HN: All 55,256 Slides of the WAR.GOV/UFO Files Searchable and Linkable https://ift.tt/W6IVx9j May 10, 2026 at 04:00AM