Show HN: Retroguard – Verifiably secure AI guardrails https://ift.tt/8zNVwXs

Show HN: Retroguard – Verifiably secure AI guardrails Cryptographically secure and verifiably robust protection with drop-in integration and outcome-based pricing https://retroguard.ai May 5, 2026 at 02:28AM

Show HN: Kanban-CLI – a web UI for local Markdown todo lists https://ift.tt/yJB1zvu

Show HN: Kanban-CLI – a web UI for local Markdown todo lists As we all are, I've been experimenting with ways to reduce external saas spend, and continually bring traditionally external pieces of context (prs, docs, trello boards) into the one mono repo. I have toyed with a markdown todo list and setting claude/codex into a "ralph" loop previously, but always missed the web ui for organising, planning, and tracking things in progress. So codex and I build kanban-cli, an installable or npx-runnable cli util that takes one or more markdown files, and uses markdown headers and todo syntax to track and manage agentic tasks. Let me know your thoughts, or if you've got a more convenient way of managing tasks! I was tempted to link to the project landing page https://ift.tt/HLJ8boa as I made a cute example demo, but linking to the repo felt less self-promo-y. Cheers! https://ift.tt/b8qaTQr May 4, 2026 at 09:28PM

Show HN: A tiny C program where an LLM rewires its DAG while running https://ift.tt/6dRSZVy

Show HN: A tiny C program where an LLM rewires its DAG while running https://ift.tt/0e2Gbdp May 4, 2026 at 10:43PM

Show HN: Let – Offline-first life events tracker (React Native, SQLite) https://ift.tt/KoR7j98

Show HN: Let – Offline-first life events tracker (React Native, SQLite) https://ift.tt/7h2sdCB May 4, 2026 at 10:53AM

Show HN: Kula – a family health platform that makes sense of your data https://ift.tt/LPkJAc0

Show HN: Kula – a family health platform that makes sense of your data My parents are in India, I'm in the US. Their health system was continuous WhatsApp photos of lab reports, vague updates over the phone, and me finding out about doctor visits weeks later. So I built Kula. Upload lab reports (photo, PDF, WhatsApp forward) and it have them parsed and track trends. Connect a wearable and track daily health signals as well as your baselines. Everything goes into one record you can search and review over time. There's a chat layer where you can ask questions in plain language like, "what's my dad's cholesterol trend showing", and get a sourced answer from your own data. Primarily built it for my family. My parents told me they'd use it even without me, just to have their records organized before doctor visits. That truly changed how I think about it. Looking for feedback on this platform. Would you use this? What are your thoughts? What's missing? www.mykula.health May 4, 2026 at 01:40AM

Show HN: ReflowPDF – wrote a layout engine because every PDF library failed https://ift.tt/nRJIfwy

Show HN: ReflowPDF – wrote a layout engine because every PDF library failed https://reflowpdf.com May 3, 2026 at 10:09PM

Show HN: I built a RISC-V emulator that runs DOOM https://ift.tt/MnP5D8d

Show HN: I built a RISC-V emulator that runs DOOM Hi HN, I built a RISC-V emulator that implements the RV32IM instruction set and a minimal syscall interface to run DOOM. A few weeks ago, I got my first output with a simple hello world assembly program. Since then I have been working tirelessly to get DOOM to run. I needed to figure out how to run C programs first, and came across newlib, which allows the underlying environment to implement the syscall stubs one by one until the programs run. I have also added ELF loading, but currently only a single `PT_LOAD` segment is supported. To port DOOM, I used doomgeneric, which was quite convenient to get working once the required stubs were in place. DOOM renders to a fixed area in memory (0x705FDD = VRAM_START): 0x7FFFFF +-------------------------------------+ | | | QUEUE_SIZE (32 bytes) | | | 0x7FFFDF +-------------------------------------+ <-- QUEUE_START 0x7FFFDE | QUEUE_READ_IDX | 0x7FFFDD | QUEUE_WRITE_IDX | +-------------------------------------+ | | | | | VRAM (1,024,000 bytes) | | | | | 0x705FDD +-------------------------------------+ <-- STACK_START | Stack | | | | | v | | | | ^ | | | | | Program data + Heap | | | 0x000000 +-------------------------------------+ I made a small linker script so that the entry point of a C program is at _start and virtual address is always 0. That kept the ELF loader code simple. Inputs are written to the queue by rvcore which are then intercepted by DOOM running inside it. Demo link: https://www.youtube.com/watch?v=f5uygzEmdLw https://github.com/lalitshankarch/rvcore May 3, 2026 at 08:57AM