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_jcrossley commented on Ask HN: What are you working on? (April 2025)    · Posted by u/david927
_jcrossley · 4 months ago
https://mujo.app I’ve been building a minimalist productivity app for musicians. Mujo adds time tracking, task management, notes and other “practice journal” tools into a simple metronome interface. Been hacking at the iOS version for a while, and starting to think about Android.
_jcrossley commented on I Don't Have Spotify   github.com/sjdonado/idont... · Posted by u/sjdonado
_jcrossley · 10 months ago
I built a proof of concept for a VC-scale app, and something like this is one of the core features. I applied to YC S24 and didn't get an interview (SUPER understandably). If anyone wants to hear details, shoot me an email (in bio); this project's vaporware until I find the right partner.
_jcrossley commented on TwoSet Violin 'ends chapter' after eleven years   thestrad.com/news/twoset-... · Posted by u/botto
_jcrossley · a year ago
I’m sad to see this - I used to binge their videos a few years back. As someone who discovered and fell in love with classical music late in life (~26), and is now a hobbyist content creator [1] they were a terrific bridge into learning about orchestral instruments that I don’t play.

I agree with others that this seems like an attempt to pivot to “music as a higher art”, e.g. the rumored Two Set Academy, like a Tonebase competitor. Which is an absolute shame, because I think they did wonders to challenge that status quo and make classical music fun.

[1] Shameless, but if anyone is curious about an adult hobbyist learning classical guitar, I’m livestreaming almost daily: https://youtube.com/jcpractices

_jcrossley commented on Vim Racer   vim-racer.com/... · Posted by u/udev4096
_jcrossley · a year ago
Just hit top 30 in all the standard races - thanks so much, this was such a delightful way to practice my new Glove80 :)
_jcrossley commented on Ask HN: What are you working on (August 2024)?    · Posted by u/david927
_jcrossley · a year ago
Building Mujo, a minimalist musicians' practice journal for iOS. It integrates time tracking, note taking, and task management into a familiar metronome UI/UX. I dearly love it (1400+ hours logged!) and it's slowly building traction. https://mujo.app
_jcrossley commented on Ask HN: Is there room for a new email hosting service?    · Posted by u/looparing
_jcrossley · a year ago
I think so. Another recent entry is purelymail, which I love because it's a flat rate for unlimited domains. I'm trying to spin up multiple "small bets", and per-user pricing is unreasonable, and for better or worse, I don't want a single catch-all email.

A secondary benefit for me is that Purelymail is cheap ($10/yr). But a major downside is that the CalDAV implementation doesn't yet support Accepted/Rejected scheduling responses. It's fantastic that they have CalDAV at all, but this one feature would seal the deal for me.

I don't mention it to suggest you could directly compete on that unlimited-users value prop, but it's an example along the lines that max_ suggests.

One that comes to mind is integration with recent ActivityPub / fediverse stuff. There might be cool design space there

_jcrossley commented on Show HN: Moocable – find people studying the same online course/book   moocable.com/... · Posted by u/junaid_97
_jcrossley · a year ago
Well, cross off another from my ever-growing list of “someday” projects. Looks excellent, well done!
_jcrossley commented on New Foundations is consistent – a difficult mathematical proof proved using Lean   leanprover-community.gith... · Posted by u/namanyayg
gerdesj · a year ago
Well, thanks a lot! One minute I'm setting up a monitoring system and then ... I've just proved two is the number after the number after zero \o/ 8)
_jcrossley · a year ago
Hope you keep going with it, it’s a blast!
_jcrossley commented on New Foundations is consistent – a difficult mathematical proof proved using Lean   leanprover-community.gith... · Posted by u/namanyayg
isaacfrond · a year ago
You could start with the Natural numbers game.

https://adam.math.hhu.de/#/g/leanprover-community/NNG4

_jcrossley · a year ago
Yea I’ve run through that a couple of years ago - was brilliant, had a lot of fun. But I mean to stay up to date and somehow contribute from the sidelines

u/_jcrossley

KarmaCake day112November 20, 2020
About
Ex-Apple/Google/Lyft iOS engineer and classical guitarist. Two successful iOS sideprojects (Pixelist Habit Tracker, Mujo Music Practice Journal).
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