I'm working on Mutacortechs, an ALife simulation where "organisms" each have their own emulated 16-bit processor with 64K RAM. Like Core Wars for the 21st century. It's a small project compared to what some others here are working on, but it's an order of magnitude larger than anything this embedded EE has ever written. I have the ISA designed, assembler complete, emulator stage 1 complete (160/204 instructions implemented), and the start of the simulation working. Last night I wrote a program in custom assembly for an "organism" that looked around, found food, moved toward it, and ate it. I'm pretty excited by the milestone!
Ask HN: What Are You Working On? (December 2025)
801–810 of 1001 posts
Re: Ask HN: What Are You Working On? (December 2025)
#802https://www.jotbird.com
A small tool that does one thing: publish Markdown and give you a link—no accounts, no setup, no project scaffolding. Paste or write Markdown, click Publish, and you get a human-readable URL you can share immediately. You can update or delete the page later using the same link.
The idea came from frustration with how oddly hard it still is to put a Markdown document on the web without turning it into a repo, a static site, or a login-gated doc. JotBird is editor-light but publishing-first, and I’m now exploring CLI and editor integrations so it can act as a simple publishing layer for tools people already use.
Re: Ask HN: What Are You Working On? (December 2025)
#803I'm working on EACL: http://github.com/theronic/eacl
EACL (Enterprise Access ControL) is a situated ReBAC authorization library based on SpiceDB, built in Clojure and backed by Datomic. EACL queries offer sub-millisecond query times and has replaced SpiceDB at work (CloudAfrica).
'Situated' here means that your permissions live _next_ to your data in Datomic, which avoids a network hop and avoids syncing to an external AuthZ system like SpiceDB, so all queries are fully consistent.
EACL is fast for typical workloads and is benchmarked against 800k permissioned entities. Once you need more scale or consistency semantics, you can sync your relationships from Datomic to SpiceDB 1-for-1 in near real-time because there is no impedance mismatch between EACL & SpiceDB.
Read the rationale for EACL here: https://eacl.dev/#why-was-eacl-built-the-problem-with-extern...
IMO, if you need fine-grained permissions, EACL is currently best-in-class for the Clojure ecosystem. EACL is especially suited to Electric Clojure applications and can be used to populate menus in real-time.
EACL would not have been possible to build solo in my spare time without modern AI models to rapidly implement specifications and test against human-written tests.
Here is a ~7-minute screen recording of EACL used from an Electric Clojure application for real-time ReBAC queries: https://x.com/PetrusTheron/status/1996344248925294773
Re: Ask HN: What Are You Working On? (December 2025)
#804I’m working on Yomu, an iOS app for reading Japanese text with adjustable furigana.
I’m learning Japanese myself (recently took JLPT N4), and I noticed that full furigana makes me rely on readings instead of actually reading kanji. Yomu lets you hide furigana for kanji up to your level and keep it for harder ones.
It’s offline-first, supports importing text from anywhere, camera OCR, and a fast dictionary.
Re: Ask HN: What Are You Working On? (December 2025)
#805I’m building PaperDrop it's a research workspace that turns PDFs and new arXiv papers into something you can actually work with (notes, questions, cross paper comparisons). Would love feedback from people who read a lot of papers: https://paperdrop.xyz
It's still early prototype / beta, but wanted to share it anyway!
Re: Ask HN: What Are You Working On? (December 2025)
#806https://copo.st
Instantly create your Tiktok/Instagram-like app for your community or brand
Re: Ask HN: What Are You Working On? (December 2025)
#807https://rounak.taptappers.club/fitness
I crunched Strava data (the Strava MCP project is incredible, and I ended up contributing to it!) and built myself this fitness hall of fame page (and also rejuvenated the remainder of the portfolio). Almost all of the stuff here is vibe coded, very happy how much I could achieve.
Re: Ask HN: What Are You Working On? (December 2025)
#808I’m tinkering with a small TCO estimator for internal apps.
It compares different approaches and makes some assumptions explicit. Mostly a rough tool to sanity-check effort and tradeoffs.
Re: Ask HN: What Are You Working On? (December 2025)
#809https://apps.apple.com/us/app/options-at-the-money-premiums/...
I am working on the android version of this app. It is a tiny tool for options trader to see all the premium on one screen. Here is the reddit thread where I initially launched it: https://www.reddit.com/r/Optionswheel/comments/1nlelbp/i_mad...
If you trade stock or options, would love to get your feedback! Thank you.
Re: Ask HN: What Are You Working On? (December 2025)
#810https://playwriter.dev
A browser automation Chrome extension and MCP. It consumes less context than playwright MCP and is more capable: it uses the playwright API directly, the Chrome extension is a CDP protocol proxy via WebSockets.
I use it for automating workflows in development but also filing taxes and other boring tasks