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Ask HN: What are you working on? (September 2025)

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521–530 of 1001 posts

Re: Ask HN: What are you working on? (September 2025)

#521
I'm working on a bunch of small tools for musicians. I want to simplify complex musical concepts by giving visual feedback and minimal UI. All modular components built with pure JavaScript.

Here are some of my first results (free PWA):

https://fretool.dev-zoo.net (Fretboard visualizer)

https://atoy.dev-zoo.net (real time audio slowdown and looper)

https://harptool.dev-zoo.net (Harmonica helper)

Re: Ask HN: What are you working on? (September 2025)

#523
post #520

Inspired by a friend getting a random email and it sparking a memory for me: https://pageday.org , a global message lottery where each day a random message is drawn to be the homepage.

What happens if the selected message is unpleasant or against your political views? Do you curate submissions? If so how?

Re: Ask HN: What are you working on? (September 2025)

#524
Currently working on https://rudys.ai to publish and optimise Google Ads campaigns on autopilot.

The idea is to be able to publish campaigns globally in any location/language and also get qualitative recommendations on what to improve. For example, if people have typos in their search terms, Rudy recommends to add it as a keyword so it can maximise the conversion.

Re: Ask HN: What are you working on? (September 2025)

#525

I've been working non-stop on my game development tutorial website: https://raizensoft.com/tutorials/ Currently it mainly focuses on libGDX which is my most favorite framework. I prefer code-centric approach because that's how game development should be in my opinion. Most of the tutorials are just pure coding with algorithms explanations. My goal is to build one of the most resourceful website for libGDX because it'…

First time hearing about libGDX. Do you have any resources on why it's your favorite framework? It might be useful for your website as well. To sort of "sell" the framework to game developers who have not used it before.

Re: Ask HN: What are you working on? (September 2025)

#526
I’ve been working on an app called Lång. A daily spending guide. It shows you what’s okay to spend based on how much needs to last how long.

For over a decade, I’ve thought about how most people seem to resist the advice about money. And also how all advice is based on the same idea: seeing where your money went and making monthly plans based on that.

I think people feel that this is a poor match for how money works. So they improvise. And because we tend to not discuss money with others, they improvise on their own. What this typically looks like is checking their balance and trying to pace things.

I’ve been trying to design the app around that. Providing support to what seems like a natural, instinctive approach to managing money.

https://apps.apple.com/app/id6443515404

Re: Ask HN: What are you working on? (September 2025)

#528
Tinkering with a tiny macOS app that gives me proactive reminders about the low battery and imminent shutdown.

Standard system notification comes at about 10%, and most of the time, in my case at least, whenever I miss that, the result is "laptop shutdown amidst an ongoing video meeting" or something like that. (Basically, too late before I act)

Just so that I don't miss the reminders, the app will show an overlay window with some text, following my cursor, and a custom sound.

I built a version this weekend, and am current doing a dogfooding exercise.

Re: Ask HN: What are you working on? (September 2025)

#529
I'm working on ScaleDown [1], a context pruning API.

So over the past few years, I have seen how contexts have been steadily growing in AI apps. And while the context lengths of LLMs have also been increasing, they are still effectively about 200k tokens. The performance drops off a cliff after that (you might have noticed it as well with long AI chats).

It is a simple API that prunes away irrelevant parts of a context for a given prompt, a.k.a. context-aware pruning. Integration is super simple: just an extra API call before the final LLM API call. You can get an API from the website.

I would love to chat if this is something that is relevant to you and if you have any feedback on what we are building!

[1] https://scaledown.ai

Re: Ask HN: What are you working on? (September 2025)

#530
post #407

Earlier quoted context omitted.

Can you talk a bit about the tech stack?

React + Vite + Tailwind on the frontend; Netlify Functions for backend with Stripe, Supabase, and email integrations; content via Markdown build script; deployed on Netlify; linted with ESLint; JavaScript-only codebase LLMs wrote 99% of the code.

The product label images loading on the homepage are huge right now. They are displayed in 128px * 128px box but are about 2 MB in size each. May be generate resized versions at build time and use tags?
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