$0β20/month (free tiers or one AI plan)Our estimate
Time
1β2 weekendsOur estimate
How to make money from it
Pricing idea: Sell content packages (for example a set of short videos a month) or a subscription app if you build a tool.
Finding your first 10 customers
Make 3 free samples for businesses you like.
Post your work daily for 2 weeks.
Offer a simple monthly package to people who comment or ask.
Ideas, not promises. Results vary.
Details: source, numbers and tags
What they did
jmole plays a new isomorphic keyboard with base-12 notation and used Codex to build a score-rendering backend on MuseScore with note heads showing each pitch class.
How it went
He says it has been pretty helpful for learning new music.
Worth knowing
Building on an existing engine (MuseScore) beat writing a renderer from scratch.
Difficulty
IntermediateOur rating
Time to build
Not reportedOur estimate
Monthly cost
Not reported
Revenue
Not reportedWe only show revenue the source states
Engagement
83 HN points79 comments Β· fetched Oct 15, 2026
X buzz
No X data
Posted Β· Added Oct 16, 2026
Original builder recipe
Codex
MuseScore
Pick a repeatable format.
Let the agent generate drafts or assets from your inputs.
Edit and check facts and rights before publishing.