Southlight I/O

Southlight I/O

Software with a
guiding light.

We build careful, honest tools for the things that matter to you. One studio, a growing family of apps - Constellate for your photos, Starchart for your dot journal - and music, made by humans, free for your stream.

Meet Constellate Explore Starchart

Our philosophy

Greatness is a choice

We build software the way it should be built: carefully, honestly, and with respect for the people who trust it with the things that matter.

Every Southlight app is measured against the same guiding light - be transparent, stay in the user’s control, and never treat their data as anything less than precious.

Greatness is a choice. We make it every day.

What we make

Apps

Coming to the Microsoft Store

Constellate

Photo sorting that shows you the plan before it moves a thing.

Learn more → Free web app

Starchart

Chart your dot journal page before you ink it. Counted layouts sized to your exact notebook.

Learn more →

Also from the studio

Music

Free to stream

Made By Humans

Free instrumental rock and metal for streamers and creators. Play it live, keep your channel clean.

Learn more →