Working on https://nadir.dev, a small app for running daily technical knowledge tests. It started just as a way to see if depending on claude-code so much recently dulled my expertise in Ruby/Rails but it turned into something bigger after some friends asked me to add non-technical topics, so now it's both for developers and "normal" people.
Ask HN: What are you working on? (September 2026)
451–460 of 823 posts
Re: Ask HN: What are you working on? (September 2026)
#452I’m building Hammer Labs ( https://hammer.ai ) to study when healthcare AI agents are wrong and when they should refuse to answer (judgement). It started after spending 15 years building AI for insurers, hospitals, data companies, and startups. Almost every system ended with "a human reviews the output". That person was usually a nurse, medical director, or certified coder. These are some of the hardest people to hir…
I was trying to learn more about your project. The comment above was digestiable for me as a non-healthcare person, but the website is really difficult for me to understand.
The web design (and text?) really come off as ChatGPT written, which lowers my interest in spending time to understand it.
Re: Ask HN: What are you working on? (September 2026)
#453I've been working on a voxel game engine called Bonsai for ~10 years. Probably the most interesting thing about it at the moment is the editor. The world, and most things in it, are represented as collections of SDFs. More accurately, they're density fields, but, potato-tomato. Bonsai has undergone a large rewrite over the last couple years that's nearing completion. A world edit is defined as a bunch of SDF paramete…
Just amazing.
Re: Ask HN: What are you working on? (September 2026)
#454I'm building an self hosted, privacy friendly attribution and marketing suite targeting mobile apps. The market is owned by a few, branch, appsflyer etc, and its impossible to become a new MMP without spending ridiculous ammounts on money on their platforms, so I'm trying to build something different, and more provacy friendly without reliying on them.
Re: Ask HN: What are you working on? (September 2026)
#455Datalog writebacks through derived columns. Any query. Any cell. And probably any datalog-based database too, it's just a client-side trick. Works well on this:
{:find [?title ?director ?rating ?card ?shout]
:where [[?m :movie/title ?title]
[?m :movie/vote-average ?rating]
[(str ?rating) ?rating-str]
[(concat ?title ": ") ?title-colon]
[(concat ?title-colon ?rating-str) ?card]
[(lower ?title) ?lowered]
[(concat ?lowered "!!!") ?decorated]
[(upper ?decorated) ?shout]
;; joints
[?cr :crew/job "Director"]
[?cr :crew/movie ?m]
[?cr :crew/person ?p]
[?p :person/name ?director]]}
Re: Ask HN: What are you working on? (September 2026)
#456https://peachjam.dev/
The cheapest possible lovable alternative with all the features. Currently in alpha.
Re: Ask HN: What are you working on? (September 2026)
#457Generative UI for education
Re: Ask HN: What are you working on? (September 2026)
#458Still OnlineOrNot ( https://onlineornot.com/ ), 5.5 years on. Most recently I shipped an MCP server (w/ OAuth sign-in) recently to expose the API a bit better to agents, a TypeScript SDK and rewrote the CLI to use it. Also been reworking the terraform provider to cover the whole OpenAPI spec's surface area. Just before LLMs became a thing I took the time to rewrite from having a private GraphQL server + public REST A…
how is this any different from healthchecks.io or openstatus.dev?
Seems I can't even selfhost your product either, which is a huge redflag in my book.
Re: Ask HN: What are you working on? (September 2026)
#459[dead]
Re: Ask HN: What are you working on? (September 2026)
#460Still hacking on https://riffradar.org/ and trying to make better recommendations on Spotify. Lately I've been experimenting with a couple of different recommendation algorithms, and will expose them soon as selection options for the different playlists. Signups have picked up somewhat recently and have ~800 MAU, which helps with trying out different things :)