Show - HN Paper

Show HN: I built a self-hosted error tracker in Rails

Show HN: Paykit – one SDK for Stripe, PayPal, Paddle (stop reading 5 API docs)

Show HN: First5Minutes, Your first 5 minutes decide your day

Show HN: I'm tired of reading five different API docs just to accept payments

Show HN: I launched an agentic platform to schedule social media posts with MCP

Show HN: B2B Virtual Deal Rooms

Show HN: HN Pulse – stay updated on Hacker News from your menu bar

Show HN: A chess middlegame trainer so I can stop blundering

Show HN: Unicorn – Text-Based VC Investment Adventure

Show HN: Pen Island – Clean Drawings via AI

Show HN: Free listing your AI tool

Show HN: Cursor for files like word, ppt, CSV using existing CLIs(codex, Claude)

Show HN: Buy/Sell Electric Vehicles

Show HN: rstructor, Pydantic+instructor for Rust

Show HN: Flat Fee MVPs for 1000 dollars

Show HN: Sebastian.run – Build mobile apps from prompts using AI

Show HN: DocSend Alternative for B2B Sales

Show HN: Mach, a new systems language that focuses on being simple and explicit

Show HN: Grampax, a "torch.autocast"-style interface for mixed precision in JAX

Show HN: Aurca AI – Find Mispriced Event Contracts on Prediction Markets