One person makes these apps.

I’m Deokwon (David) Song. I studied computer science at Carnegie Mellon, with a minor in human-computer interaction, and graduated in 2018. LonelyDuck is the name I make Mac apps under.

Canto, a private notebook that reads with you, and Tulip, a companion for the Music app, are sold here, each with a free tier and a one-time Pro license. opsty, a terminal you don’t have to watch, and subtank, a menu-bar meter for your AI plans, are free and live on their own sites. The habit is the same in all four: each app says plainly what leaves your Mac.

Write to support@lonelyduck.io about any of them. One person answers, usually within two working days.

• CantoA private notebook that reads with you.
• TulipNothing in your library changes until you say so.
• opstyThe terminal you don’t have to watch.
• subtankSee what’s left in every AI plan.