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Show HN: Ferrite – Markdown editor in Rust with native Mermaid diagram rendering

Ferrite: Fast Markdown/Text/Code editor in Rust with native Mermaid diagrams<p>Built a Markdown editor using Rust + egui. v0.2.1 just dropped with major Mermaid improvements:<p>→ Native Mermaid diagrams - Flowcharts, sequence, state, ER, git graphs - pure Rust, no JS<p>→ Split view - Raw + rendered side-by-side with sync scrolling<p>→ Syntax highlighting - 40+ languages with large file optimization<p>→ JSON/YAML/TOML tree viewer - Structured editing with expand/collapse<p>→ Git integration - File tree shows modified/staged/untracked status<p>Also: minimap, zen mode, auto-save, session restore, code folding indicators.<p>~15MB binary, instant startup. Windows/Linux/macOS.<p>GitHub: <a href="https://github.com/OlaProeis/Ferrite" rel="nofollow">https://github.com/OlaProeis/Ferrite</a><p>v0.2.2 coming soon with performance improvements for large files. Looking for feedback!

Show HN: I used Claude Code to discover connections between 100 books

I think LLMs are overused to summarise and underused to help us read deeper.<p>I built a system for Claude Code to browse 100 non-fiction books and find interesting connections between them.<p>I started out with a pipeline in stages, chaining together LLM calls to build up a context of the library. I was mainly getting back the insight that I was baking into the prompts, and the results weren't particularly surprising.<p>On a whim, I gave CC access to my debug CLI tools and found that it wiped the floor with that approach. It gave actually interesting results and required very little orchestration in comparison.<p>One of my favourite trail of excerpts goes from Jobs’ reality distortion field to Theranos’ fake demos, to Thiel on startup cults, to Hoffer on mass movement charlatans (<a href="https://trails.pieterma.es/trail/useful-lies/" rel="nofollow">https://trails.pieterma.es/trail/useful-lies/</a>). A fun tendency is that Claude kept getting distracted by topics of secrecy, conspiracy, and hidden systems - as if the task itself summoned a Foucault’s Pendulum mindset.<p>Details:<p>* The books are picked from HN’s favourites (which I collected before: <a href="https://hnbooks.pieterma.es/" rel="nofollow">https://hnbooks.pieterma.es/</a>).<p>* Chunks are indexed by topic using Gemini Flash Lite. The whole library cost about £10.<p>* Topics are organised into a tree structure using recursive Leiden partitioning and LLM labels. This gives a high-level sense of the themes.<p>* There are several ways to browse. The most useful are embedding similarity, topic tree siblings, and topics cooccurring within a chunk window.<p>* Everything is stored in SQLite and manipulated using a set of CLI tools.<p>I wrote more about the process here: <a href="https://pieterma.es/syntopic-reading-claude/" rel="nofollow">https://pieterma.es/syntopic-reading-claude/</a><p>I’m curious if this way of reading resonates for anyone else - LLM-mediated or not.

Show HN: Scroll Wikipedia like TikTok

Hey - I've been playing with LLMs since GPT-2 and recently experimented with fully generative UIs where the HTML/Canvas are generated just-in-time.<p>Every post on the feed( on slop/duck/storytime) you see is streamed and generated just-in-time with HTML and into a Canvas with Gemini 3 Flash.<p>Comments and DMs are bidirectionally linked with a Cloudflare Workers Durable Object which is why they feel so fast. Every generated post is saved into a DO SQLite which is then served into the "Following" feed so it can be served quicker.<p>This was inspired by Wikitok, a VSCode Extension I made around brainrot, and another fully generative UI site I made.

Show HN: I made a memory game to teach you to play piano by ear

Show HN: Prism.Tools – Free and privacy-focused developer utilities

Hi HN, I'm Barry and I've built Prism.Tools (<a href="https://blgardner.github.io/prism.tools/" rel="nofollow">https://blgardner.github.io/prism.tools/</a>) – a collection of client-side developer utilities that respect your privacy.<p>Many of these tools were used way back in the days when I ran a BBS and started my communities first ISP, serving three local communities with Dial-Up Internet, Web Hosting etc. The tools have been refined to reflect the changes in tech since then and designed for the Novice and Pro alike. As I locate more tools others may find useful I will refine and add them to the collection. Use them, Share them, or not. They will be here if you need them...<p>40+ dev tools (JSON formatters, regex tester, base64 encoder, Git command helper, etc.) that run entirely in your browser. Zero tracking, zero analytics, zero data collection – everything processes locally. Self-contained HTML files with no build process or frameworks.<p>I realized I had a lot of tools/utilities I've built over the years for my own use. I lothe having to 'sign-up' just to access/use simple utilities that I can create myself. I've refined them and put them in one safe place so I could easily access them if/when needed. I decided to make them available via Github Pages for anyone that may find them useful. Prism.Tools is the result.<p>Each tool is a standalone HTML file with embedded CSS and JavaScript. No frameworks, no npm packages, no build steps – just open the file and it works.<p>The entire toolset:<p>- 100% client-side processing – your data never leaves your browser.<p>- No external dependencies except for specific libraries from cdnjs.cloudflare.com (marked.js for markdown, exifr for image metadata, etc.)<p>- Consistent dark UI – every tool follows the same design language for familiarity.<p>- Vanilla JS where possible – only reaching for Public CDN Resources when necessary.<p>The constraint of "single HTML file" was intentional. It forces simplicity and ensures tools remain maintainable. It also means users can inspect, modify, or self-host any tool trivially.<p>These tools have helped me with debugging production issues, Quick formatting tasks, learning Git commands (the Git command helper has been particularly helpful)<p>Just visit <a href="https://blgardner.github.io/prism.tools/" rel="nofollow">https://blgardner.github.io/prism.tools/</a> and try any tool. No signup, no install.<p>What tools are missing that you find yourself needing? Any performance issues with specific tools? UI/UX friction points?<p>All tools follow the same privacy-first philosophy... Your data stays in your browser. No accounts, no tracking, no servers processing your information. The project is also a demonstration that you don't always need React, Vue, or complex build pipelines – sometimes vanilla JavaScript in a single HTML file is exactly the right tool for the job.<p>Vanilla JavaScript (ES6+) CSS3 with CSS Grid Minimal external libraries: marked.js, exifr, highlight.js, sql-formatter (all from CDN) No frameworks, no bundlers, no npm Hosted on Github Pages<p>Happy to answer questions about the technical implementation, design decisions, or specific tools!<p>All tools are inspectable – just view source on any page to see exactly how they work!

Show HN: Tailsnitch – A security auditor for Tailscale

Show HN: DoNotNotify – Log and intelligently block notifications on Android

Why - I got sick of apps abusing notifications on my Android phone. While the OS does give you the ability to switch off notifications based on channels, most apps either don't use it or abuse it intentionally. In my case, I live in a gated society that uses an app called MyGate to allow visitors, and the app intentionally pushes ads through the same channels since you cannot block them.<p>What - DoNotNotify is an app that logs all incoming notifications, and displays them grouped by app. It also captures the action behind the notification, which can be triggered from the app itself. From this log, you can create rules to whitelist/blacklist notifications from apps depending on their notification content. These filters can even be regex expressions, which allows for more complicated use-cases. The app ships with some pre-defined rules for popular apps like Facebook, Amazon, Instagram, Netflix, TikTok, Reddit etc.<p>Where - The website is at <a href="https://donotnotify.com/" rel="nofollow">https://donotnotify.com/</a>.<p>Would also like to call out that the app runs purely on your device, never communicates with anything on the Internet, and only requires notifications access to work. It is completely free, and there is no advertising or hidden gotchas.

Show HN: An interactive guide to how browsers work

Show HN: Terminal UI for AWS

Show HN: Terminal UI for AWS

Show HN: I used AI to recreate a $4000 piece of audio hardware as a plugin

Hi Hacker News,<p>This is definitely out of my comfort zone. I've never programmed DSP before. But I was able to use Claude code and have it help me build this using CMajor.<p>I just wanted to show you guys because I'm super proud of it. It's a 100% faithful recreation based off of the schematics, patents, and ROMs that were found online.<p>So please watch the video and tell me what you think<p><a href="https://youtu.be/auOlZXI1VxA" rel="nofollow">https://youtu.be/auOlZXI1VxA</a><p>The reason why I think this is relevant is because I've been a programmer for 25 years and AI scares the shit out of me.<p>I'm not a programmer anymore. I'm something else now. I don't know what it is but it's multi-disciplinary, and it doesn't involve writing code myself--for better or worse!<p>Thanks!

Show HN: Website that plays the lottery every second

Show HN: Enroll, a tool to reverse-engineer servers into Ansible config mgmt

Happy new year folks!<p>This tool was born out of a situation where I had 'inherited' a bunch of servers that were not under any form of config management. Oh, the horror...<p>Enroll 'harvests' system information such as what packages are installed, what services are running, what files have 'differed' from their out-of-the-box defaults, and what other custom snowflake data might exist.<p>The harvest state data can be kept as its own sort of SBOM, but also can be converted in a mere second or two into fully-functional Ansible roles/playbooks/inventory.<p>It can be run remotely over SSH or locally on the machine. Debian and Redhat-like systems are supported.<p>There is also a 'diff' mode to detect drift over time. (Years ago I used Puppet instead of Ansible and miss the agent/server model where it would check in and re-align to the expected state, in case people were being silly and side-stepping the config management altogether). For now, diff mode doesn't 'enforce' but is just capable of notification (webhook, email, stdout) if changes occur.<p>Since making the tool, I've found that it's even useful for systems where you <i>already</i> have in Ansible, in that it can detect stuff you forgot to put into Ansible in the first place. I'm now starting to use it as a 'DR strategy' of sorts: still favoring my normal Ansible roles day-to-day (they are more bespoke and easier to read), but running enroll with '--dangerous --sops' in the background periodically as a 'dragnet' catch-all, just in case I ever need it.<p>Bonus: it also can use my other tool JinjaTurtle, which converts native config files into Jinja2 templates / Ansible vars. That one too was born out of frustration, converting a massive TOML file into Ansible :)<p>Anyway, hope it's useful to someone other than me! The website has some demos and more documentation. Have fun every(any)-one.

Show HN: OpenWorkers – Self-hosted Cloudflare workers in Rust

I've been working on this for some time now, starting with vm2, then deno-core for 2 years, and recently rewrote it on rusty_v8 with Claude's help.<p>OpenWorkers lets you run untrusted JS in V8 isolates on your own infrastructure. Same DX as Cloudflare Workers, no vendor lock-in.<p>What works today: fetch, KV, Postgres bindings, S3/R2, cron scheduling, crypto.subtle.<p>Self-hosting is a single docker-compose file + Postgres.<p>Would love feedback on the architecture and what feature you'd want next.

Show HN: Use Claude Code to Query 600 GB Indexes over Hacker News, ArXiv, etc.

Paste in my prompt to Claude Code with an embedded API key for accessing my public readonly SQL+vector database, and you have a state-of-the-art research tool over Hacker News, arXiv, LessWrong, and dozens of other high-quality public commons sites. Claude whips up the monster SQL queries that safely run on my machine, to answer your most nuanced questions.<p>There's also an Alerts functionality, where you can just ask Claude to submit a SQL query as an alert, and you'll be emailed when the ultra nuanced criteria is met (and the output changes). Like I want to know when somebody posts about "estrogen" in a psychoactive context, or enough biology metaphors when talking about building infrastructure.<p>Currently have embedded: posts: 1.4M / 4.6M comments: 15.6M / 38M That's with Voyage-3.5-lite. And you can do amazing compositional vector search, like search @FTX_crisis - (@guilt_tone - @guilt_topic) to find writing that was about the FTX crisis and distinctly without guilty tones, but that can mention "guilt".<p>I can embed everything and all the other sources for cheap, I just literally don't have the money.

Show HN: Use Claude Code to Query 600 GB Indexes over Hacker News, ArXiv, etc.

Paste in my prompt to Claude Code with an embedded API key for accessing my public readonly SQL+vector database, and you have a state-of-the-art research tool over Hacker News, arXiv, LessWrong, and dozens of other high-quality public commons sites. Claude whips up the monster SQL queries that safely run on my machine, to answer your most nuanced questions.<p>There's also an Alerts functionality, where you can just ask Claude to submit a SQL query as an alert, and you'll be emailed when the ultra nuanced criteria is met (and the output changes). Like I want to know when somebody posts about "estrogen" in a psychoactive context, or enough biology metaphors when talking about building infrastructure.<p>Currently have embedded: posts: 1.4M / 4.6M comments: 15.6M / 38M That's with Voyage-3.5-lite. And you can do amazing compositional vector search, like search @FTX_crisis - (@guilt_tone - @guilt_topic) to find writing that was about the FTX crisis and distinctly without guilty tones, but that can mention "guilt".<p>I can embed everything and all the other sources for cheap, I just literally don't have the money.

Show HN: 22 GB of Hacker News in SQLite

Community, All the HN belong to you. This is an archive of hacker news that fits in your browser. When I made HN Made of Primes I realized I could probably do this offline sqlite/wasm thing with the whole GBs of archive. The whole dataset. So I tried it, and this is it. Have Hacker News on your device.<p>Go to this repo (<a href="https://github.com/DOSAYGO-STUDIO/HackerBook" rel="nofollow">https://github.com/DOSAYGO-STUDIO/HackerBook</a>): you can download it. Big Query -> ETL -> npx serve docs - that's it. 20 years of HN arguments and beauty, can be yours forever. So they'll never die. Ever. It's the unkillable static archive of HN and it's your hands. That's my Year End gift to you all. Thank you for a wonderful year, have happy and wonderful 2026. make something of it.

Show HN: 22 GB of Hacker News in SQLite

Community, All the HN belong to you. This is an archive of hacker news that fits in your browser. When I made HN Made of Primes I realized I could probably do this offline sqlite/wasm thing with the whole GBs of archive. The whole dataset. So I tried it, and this is it. Have Hacker News on your device.<p>Go to this repo (<a href="https://github.com/DOSAYGO-STUDIO/HackerBook" rel="nofollow">https://github.com/DOSAYGO-STUDIO/HackerBook</a>): you can download it. Big Query -> ETL -> npx serve docs - that's it. 20 years of HN arguments and beauty, can be yours forever. So they'll never die. Ever. It's the unkillable static archive of HN and it's your hands. That's my Year End gift to you all. Thank you for a wonderful year, have happy and wonderful 2026. make something of it.

Show HN: Stop Claude Code from forgetting everything

I got tired of Claude Code forgetting all my context every time I open a new session: set-up decisions, how I like my margins, decision history. etc.<p>We built a shared memory layer you can drop in as a Claude Code Skill. It’s basically a tiny memory DB with recall that remembers your sessions. Not magic. Not AGI. Just state.<p>Install in Claude Code:<p><pre><code> /plugin marketplace add https://github.com/mutable-state-inc/ensue-skill /plugin install ensue-memory # restart Claude Code </code></pre> What it does: (1) persists context between sessions (2) semantic & temportal search (not just string grep). Basically git for your Claude brain<p>What it doesn’t do: - it won’t read your mind - it’s alpha; it might break if you throw a couch at it<p>Repo: <a href="https://github.com/mutable-state-inc/ensue-skill" rel="nofollow">https://github.com/mutable-state-inc/ensue-skill</a><p>If you try it and it sucks, tell me why so I can fix it. Don't be kind, tia

Show HN: Vibe coding a bookshelf with Claude Code