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

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11–20 of 59 posts

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

#15
I've been building an app to replace a long-suffering Excel sheet I've used for retirement planning. Started off as a calculator, eventually turned into something like ProjectionLab, though with a focus on what-if scenarios (e.g., how many years can I knock off my working life if I downsize to a smaller house or relocate to another state?) and risk evaluation specifically for early retirement. Not super fancy, but it's already flagged some risks that my spreadsheet didn't, and it's fun to have a codebase that's fully owned/controlled by me.

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

#16
I'm working on Happy Coder, an open source Codex and Claude Code native mobile app (plus a web app).

Happy lets you spawn and control multiple Codex/Claude Code sessions in parallel. Happy Coder runs on your hardware, works from your phone and desktop, costs nothing, End to End encrypted, and permissive MIT License.

https://github.com/slopus/happy

Happy Coder is a unix style "do one thing well" project.

The goal is zero workflow disruption. I want to be able to run CLI coding agents on any internet connected computer, and control them with my phone. Happy has a command line wrapper for Codex and Claude Code that let you start a session in your terminal, and then continue it from your phone with real time sync. So type in your terminal and see it on the phone, type into your phone and see it in your terminal. So you can switch back and forth.

There is an optional voice agent some contributors have been hacking on that lets you talk to the voice agent first, and the voice agent then writes prompts for Codex/Claude Code and answers questions about what the coding agent running on your computer is doing/did. The voice agent feature is pretty neat, but in my opinion needs a bit more iteration, so any ideas or help would be awesome.

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

#17
hey!! I am working on rent savy city :) I would love it you guys checked it out www.rentsavycity.com and sent feedback, we are also building a community where renters can easily attend events,find discounts in local markets and agents can purchase leads. follow our journey!! :P

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

#18

I've been building an app to replace a long-suffering Excel sheet I've used for retirement planning. Started off as a calculator, eventually turned into something like ProjectionLab, though with a focus on what-if scenarios (e.g., how many years can I knock off my working life if I downsize to a smaller house or relocate to another state?) and risk evaluation specifically for early retirement. Not super fancy, but it…

sounds cool! you should build an app that helps you save towards a goal and shows you losses and wins in real time for the future when you add more or remove from savings in an app or even "what if " i make extra 20 dollars on my 7% car note

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

#19
post #3

Been working on https://phrasing.app for about 18 months now. I wanted a way where I could learn a maintain multiple languages, all in one place. I wanted the power of spaced repetition, the frictionless experience of social media, and the joy of a beautifully designed application. It’s built and I’ve been using it daily for about 8 months now, and lately it’s been working remarkably well. I’m learning several langua…

this sounds kind of cool I just dont understand what your company does right away... i get it but there is a lot of words on the site but love the color scheme and the site !!!
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